IBIC2023 - List of Keywords (operation)

Paper	Title	Other Keywords	Page
MO2C03	Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth	feedback, synchrotron, controls, lattice	7
	P.S. Kallakuri, A.R. Brill, J. Carwardine, L. Emery, N. Sereno ANL, Lemont, Illinois, USA
	Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357. The fast orbit feedback (FOFB) bandwidth for Advanced photon source upgrade (APS-U) will be DC-1 kHz and the synchrotron frequency will be between 100-560 Hz. This frequency overlap places coupled bunch mode 0 (CBM0) induced horizontal orbit motion inside the orbit feedback bandwidth, potentially affecting our ability to achieve beam stability goals. Longitudinal feedback kicker is not strong enough to damp CBM0 oscillations. We developed new beam-based feedback method to suppress CBM0 oscillations with low level RF phase as actuator. It uses existent FOFB framework with no changes to the feedback algorithm. Effectiveness of this method is verified using present APS operations lattice where synchrotron frequency is outside orbit feedback bandwidth. In the present work, low alpha lattice is created to emulate APS-U setting where synchrotron frequency is inside the orbit feedback bandwidth. Experiments with this lattice successfully demonstrated CBM0 correction within FOFB bandwidth. Combined operation of orbit feedback and CBM0 correction is stable, and CBM0 oscillations are damped. We achieved better orbit motion suppression and corrector drive efforts are reduced as well. P. Kallakuri et al., ’Coupled bunch mode zero correction using orbit measurements and RF system phase feedback’, doi:10.1103/PhysRevAccelBeams.25.082801
	Slides MO2C03 [1.326 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2C03
About •	Received ※ 14 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023
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MO3C04	A MTCA Based BPM-System for PETRA IV	electron, brilliance, electronics, controls	19
	G. Kube, H.T. Duhme, J.L. Lamaack, F. Schmidt-Föhre, K. Wittenburg DESY, Hamburg, Germany A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, M.O. Oblak, P. Paglovec, B. Repič I-Tech, Solkan, Slovenia
	The PETRA IV project aims to upgrade the present PETRA III synchrotron into an ultra low-emittance source. The small emittances translate directly into much smaller beam sizes, thus imposing stringent requirements on the machine stability. In order to measure beam positions and control orbit stability to the level of 10% of beam size and divergence, a high resolution BPM system will be installed which consists of 788 individual monitors with the readout electronics based on MTCA.4. In order to fulfil the long-term drift requirement (< 1 micron over 7 days), several analog, digital and SW parts were taken from the Libera Brilliance⁺ and a new RTM module has been developed to be used as BPM electronics RFFE. In addition, its analogue RF switch matrix used for long-term stabilization was separated and placed close to the BPM pickup, hence enabling an additional stabilization of the RF cables. At present, a fully populated MTCA crate with 6 AMC boards for the readout of 12 BPMs is installed at PETRA III and is extensively being tested. This contribution summarizes the latest beam measurements, demonstrating the high performance of the BPM system and the external stabilization concept.
	Slides MO3C04 [3.604 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C04
About •	Received ※ 06 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 02 October 2023
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MO3C05	Canadian Light Source Beam Position Visualization Tool	EPICS, network, controls, storage-ring	24
	M. Bree, T. Batten, C.W. Stevens, J.M. Vogt CLS, Saskatoon, Saskatchewan, Canada
	The CLS Orbit Correction (OC) system acquires, collates, and publishes storage ring beam centroid position information from 48 beam position monitors (BPMs) at a rate of 1000 samples per second. We present a "Storage Ring Beam Position Visualization Tool" that computes and displays dynamic Fast Fourier Transforms (FFTs) and Cumulative Power Spectral Densities (CPSDs) for all BPMs in real-time using full resolution data. The computed FFTs and CPSDs can be plotted in various combinations and in waterfall plots that allow visualization of changes over long periods of time. In addition, correlations between all BPM channel combinations are computed and ranked. Data from any two BPM channels can be selected for plotting in two dimensions wherein correlations are visually apparent. Computed CPSDs are further binned and published in scalar EPICS PVs which are archived for further analysis. Preliminary results from the Beam Position Visualization Tool have proven useful in characterizing beam position noise at the CLS.
	Slides MO3C05 [197.014 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C05
About •	Received ※ 17 July 2023 — Revised ※ 16 August 2023 — Accepted ※ 13 September 2023 — Issue date ※ 26 September 2023
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MOP011	Safety Considerations for Shield Door Control Systems	controls, PLC, GUI, cathode	59
	H.A. Watkins, W.C. Barkley, C.D. Hatch, D. Martinez, D. Rai, E.I. Simakov LANL, Los Alamos, New Mexico, USA
	Funding: Los Alamos National Lab LDRD The Accelerator Operations and Technology division is upgrading the control system for a 33-ton shield door that will be used when the Cathodes and RF Interactions in Extremes (CARIE) accelerator begins operations. The door was installed in the 1990¿s but safety standards such as ISO 13849-1 have since emerged which provide safety requirements and guidance on the principles for the design and integration of safety-related parts of a control system. Applying this standard, a safety controller, safety relays and a light curtain barrier have been added to eliminate injury and exposure of personnel to potential hazards during door operations. LANL Report #: LA-UR-23-25064
	Poster MOP011 [0.827 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP011
About •	Received ※ 31 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023
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MOP019	First Test with MicroTCA Based Cavity BPM Electronics for the European XFEL and FLASH	electron, cavity, electronics, FEL	70
	B. Lorbeer, H.T. Duhme, I. Krouptchenkov, T. Lensch, D. Lipka, M. Werner DESY, Hamburg, Germany
	The European X-ray free-electron laser (E-XFEL) and the FLASH2020+ project for the free electron laser Hamburg (FLASH) at DESY in Hamburg, Germany foresee several machine upgrades in the years to come. At FLASH a whole undulator section in a shutdown starting in summer 2024 and finishing in autumn 2025 is going to be rebuild. Existing button beam position monitors installed in this section of the machine do not deliver sufficient signal strength for future required resolution specification and orbit feedback optimization for machine operation. The resolution limitations will be overcome by replacing the button-based beam position monitors with in-house developed cavity beam position monitors and compact microTCA based radio frequency receiver read-out electronics. The measurement system has been tested and evaluated in a test setup at FLASH.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP019
About •	Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 21 September 2023 — Issue date ※ 30 September 2023
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MOP023	The Conceptual Design Study for New BPM Signal Processing System of J-PARC (MR)	impedance, controls, network, FPGA	78
	K. Satou, T. Toyama, S. Yamada KEK, Tokai, Ibaraki, Japan
	The BPM signal processing system, which is19 years old system, have been suffering from gain fluctuation due to contact resistance of the mechanical gain selector, communication disruption caused by an unstable contact of a card edge connector. In addition, it has a difficulty of repairments because some on-board parts have already reached end of product-life cycle, and some units have been in unusable situation. Presently, we are on the beam power upgrade campaign to 1.3 MW by increasing beam bunch current and shortening the MR operation cycle, and precise beam tunings would require massive waveform data processing and transfer to a storage than the present system. For this, we have been developing the system based on the 10 GbE optical link. The ADC board which is under development would perform direct sampling using the third harmonic of RF. The digital IQ demodulation technique is used to extract the baseband oscillation from the raw data. The obtained raw waveform as well as closed orbit data would be stored in the data storage system. In the presentation, we will report on the progress of development aimed at operation in 2025 and the conceptual design of the new system.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP023
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 19 September 2023
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MOP026	A Novel BPM Mechanical Center Calibration Method Based on Laser Ranging	laser, experiment, software, electronics	82
	X.H. Tang, J.S. Cao, Y.Y. Du, J. He, Y.F. Sui, J.H. Yue IHEP, Beijing, People’s Republic of China
	Determining the mechanical center of the beam position monitor(BPM) has been a difficulty for BPM calibration. To solve this problem, a method of positioning the BPM mechanical center based on laser ranging is proposed. This method uses high-precision antenna support as the core locating datum, and high-precision laser ranging sensors(LRSs) as the detection tool. By detecting the distances from the LRSs to the antenna support and the distances from the LRSs to the BPM, the mechanical center of the BPM can be indirectly determined. The theoretical system error of this method is within 20¿m, and the experimental results show that the measurement repeatability is less than 40¿m, This method has low cost and fast speed, which can be used for large-scale calibration.
	Poster MOP026 [1.142 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP026
About •	Received ※ 13 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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MOP033	1L Target Harp Diagnostic Display Tool	target, diagnostics, neutron, status	99
	A.D. Walker, E.L. Kerstiens LANL, Los Alamos, New Mexico, USA
	The Los Alamos Neutron Science Center (LANSCE) completed upgrades to its 1L Target Facility, which included installing the new Mark IV target assembly. This added a third tungsten target located upstream of the other two targets. Prior to Mark IV, beam centering on target was achieved by using thermocouples mounted to the quadrants and center of the upper target coolant chamber. It is slightly offset from center of the old upper target and it shadows several of the thermocouples previously used to center beam on target. This required adjustments to the diagnostic tools utilized to monitor position of the H⁻ beam that is being delivered to the 1L target. The original display included the thermocouple readouts and displayed a visual beam profile and position taken from an upstream harp. With some of the thermocouples now being shadowed, an image overlay was added to show where the harp¿s measured beam position is relative to both the upper and middle targets. This gives the beam operations team an additional level of awareness when it comes to thermocouple temperatures, beam steering, and beam tuning. Details of the display tool and its associated upgrades are presented. LANL Report #: LA-UR-23-25004
	Poster MOP033 [0.825 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP033
About •	Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
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MOP037	Tune Feedback at the Canadian Light Source	feedback, quadrupole, injection, storage-ring	106
	W.A. Wurtz, C.K. Baribeau, A.M. Duffy CLS, Saskatoon, Saskatchewan, Canada
	In order to maintain good injection efficiency for top-up operation at the Canadian Light Source, we must keep the betatron tunes constant even as changes in insertion device fields cause the tunes to vary. To meet this requirement, we implemented a tune feedback system. We measure the tunes at a rate of 1 Hz using Dimtel bunch-by-bunch systems. The transverse feedback function of the bunch-by-bunch systems provides tune measurements without disturbing the electron beam. We adjust two quadrupole families at a rate of 0.25 Hz to control the horizontal and vertical tunes. In this article we describe the tune feedback system, its development and its performance. The system has proven to be very robust, enabling reliable top-up operation.
	Poster MOP037 [1.284 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP037
About •	Received ※ 24 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 21 September 2023
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MOP043	Using Lag Compensator in Orbit Feedback	feedback, power-supply, vacuum, simulation	123
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Growing demand on the beam orbit stability requires higher loop gain within the operational bandwidth. Increasing the gain leads to the increase of the unity gain frequency and creates problems with systems stability due to the additional phase shifts caused by the trims (power supplies, eddy currents in vacuum chambers, etc.) and filtering of beam position data. Conventionally employed systems have 20 dB/decade slope near the unity gain providing 90 degrees phase shift which is sufficient for stability. Utilizing one or more lag compensators allows to increase the gain at low frequencies while keeping phase margin acceptable. The paper provides more details on the proposed solution as well as simulations of how the transients will be modified.
	Poster MOP043 [0.230 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP043
About •	Received ※ 25 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 23 September 2023
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MOP044	"Instantaneous" Lifetime Measurement in Storage Ring with Top-Up Injection	injection, storage-ring, electron, collider	125
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Top-up operation becomes routine in the light sources. The goal of the top-up operation is to keep the current of the circulating beam stable to avoid variations of the heat load on the beamline optics. It is also considered for the electron-ion collider to maintain the polarization of the electron beam. Frequent re-injection makes measurement of the beam lifetime very difficult if possible. Since, only part of the bunch train is refreshed during the injection cycle then the distribution of the bunch charges in the train has a characteristic saw-tooth distribution. The slope of saw tooth and step in the bunch charge distribution is defined by the lifetime and filling frequency. Both parameters can be used for the measurement. The data for processing can be obtained either from fast current transformer or from the raw ADC signal from beam position monitor. In this paper we present the theoretical considerations as well as experimental data from NSLS-II storage ring.
	Poster MOP044 [0.284 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP044
About •	Received ※ 25 August 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 18 September 2023
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TU2I02	First Direct Measurement of Electron and Positron Bunch Characteristics during Positron Capture Process at the Positron Source of the SuperKEKB B-Factory	positron, target, electron, factory	146
	T. Suwada KEK, Ibaraki, Japan
	Electron (e-) and positron (e+) bunch characteristics were directly measured for the first time using wideband beam monitors (WBMs) and a detection system at the e⁺ source of the SuperKEKB B-factory. Both secondarily-generated e^- and e⁺ bunches after the e±production target were clearly identified in their dynamical capture process at locations of the WBMs under two-bunch acceleration scheme. Not only the longitudinal but also transverse bunch characteristics, the time intervals between the e^- and e⁺ bunches, the bunch lengths, transverse bunch positions, and bunch charges were simultaneously separately measured for each bunch as functions of the capture phase to investigate their dynamical capture process. The results show that quite symmetric dynamical behaviors for the e^- and e⁺ bunch characteristics were clearly observed. The new WBMs open up a new window for direct measurements of both the e^- and e⁺ bunches during their dynamical capture process and in the optimization procedure of the e⁺ bunch intensity in multidimensional parameter spaces at any e⁺ sources. The historical backgrounds for introducing and implementing the new WBMs are also described in this report.
	Slides TU2I02 [2.925 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2I02
About •	Received ※ 07 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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TU3C02	FPGA Architectures for Distributed ML Systems for Real-Time Beam Loss De-Blending	network, real-time, distributed, FPGA	160
	M.A. Ibrahim, J.M.S. Arnold, M.R. Austin, J.R. Berlioz, P.M. Hanlet, K.J. Hazelwood, J. Mitrevski, V.P. Nagaslaev, A. Narayanan, D.J. Nicklaus, G. Pradhan, A.L. Saewert, B.A. Schupbach, K. Seiya, R.M. Thurman-Keup, N.V. Tran Fermilab, Batavia, Illinois, USA J.YC. Hu, J. Jiang, H. Liu, S. Memik, R. Shi, A.M. Shuping, M. Thieme, C. Xu Northwestern University, EVANSTON, USA
	Funding: Operated by Fermi Research Alliance, LLC under Contract No.DE-AC02-07CH11359 with the United States Department of Energy. Additional funding provided by Grant Award No. LAB 20-2261 [1] The Real-time Edge AI for Distributed Systems (READS) project’s goal is to create a Machine Learning (ML) system for real-time beam loss de-blending within the accelerator enclosure, which houses two accelerators: the Main Injector (MI) and the Recycler (RR). In periods of joint operation, when both machines contain high intensity beam, radiative beam losses from MI and RR overlap on the enclosure¿s beam loss monitoring (BLM) system, making it difficult to attribute those losses to a single machine. Incorrect diagnoses result in unnecessary downtime that incurs both financial and experimental cost. The ML system will automatically disentangle each machine¿s contributions to those measured losses, while not disrupting the existing operations-critical functions of the BLM system. Within this paper, the ML models, used for learning both local and global machine signatures and producing high quality inferences based on raw BLM loss measurements, will only be discussed at a high-level. This paper will focus on the evolution of the architecture, which provided the high-frequency, low-latency collection of synchronized data streams to make real-time inferences. Performed at Northwestern with support from the Departments of Computer Science and Electrical and Computer Engineering
	Slides TU3C02 [17.830 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C02
About •	Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 25 September 2023
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TU3C03	Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC	betatron, luminosity, emittance, collimation	164
	P.D. Hermes, M. Giovannozzi, C.E. Montanari, S. Morales Vigo, S. Redaelli, B. Salvachúa CERN, Meyrin, Switzerland M. Rakic EPFL, Lausanne, Switzerland
	Measurements in the CERN Large Hadron Collider (LHC) have indicated that the population of the transverse beam halo is greater than that of a Gaussian distribution. With the upcoming High Luminosity upgrade (HL-LHC), the stored beam energy in the beam halo could become large enough to threaten the integrity of the collimation system. Considerable efforts during the ongoing LHC Run 3 are dedicated to characterising the transverse beam halo, and its diffusion properties, after the LHC Injector Upgrade (LIU) in preparation for HL-LHC operation. Given the unprecedented stored beam energies of about 400MJ, presently achieved at the LHC, and about 700MJ planned at the HL-LHC, conventional measurements are difficult. Halo and diffusion measurements are currently based on collimator scans, where robust collimators are inserted in steps into the circulating beam halo. In this contribution, we present techniques for halo characterisation employed in LHC and compare results obtained from such measurements in LHC Run 2 and the ongoing LHC Run 3. We present plans for measurements in the remainder of LHC Run 3 and describe expected challenges for halo quantification in HL-LHC.
	Slides TU3C03 [5.876 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C03
About •	Received ※ 05 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 12 September 2023
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TUP002	Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings	luminosity, feedback, detector, vacuum	179
	M. Tobiyama, H. Ikeda, G. Mitsuka KEK, Ibaraki, Japan
	In the SuperKEKB rings, we have encountered extremely-fast beam losses occurring primarily within one to two turns in some parts of the bunch train. Such ¿sudden beam loss¿ induced severe failure in the vertical collimator heads, quenches on the superconducting final quadrupoles, and damage on the Belle II detector in some cases. Thus it is essential to investigate the cause and take countermeasures. This paper presents the phenomena clarified by the bunch current and position monitor of the bunch feedback system. The upgrade plan for the existing monitor, and recently developed simple monitors installed in the suspected area is also introduced.
	Poster TUP002 [0.727 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP002
About •	Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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TUP009	Bunch Length Measurement System Downstream the Injector of the S-DALINAC	linac, optics, electron, radiation	200
	A. Brauch, M. Arnold, M. Dutine, J. Enders, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, D. Schneider TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by the State of Hesse within the Cluster Project ELEMENTS (Project ID 500/10.006) and by DFG (GRK 2128 AccelencE). The S-DALINAC is a thrice recirculating electron accelerator for high resolution electron scattering experiments with a continuous-wave beam at a frequency of 2.9972(1) GHz. Short bunches are crucial to enable tuning of the machine for operation as an energy-recovery linear accelerator* *. Currently, measurements of this beam parameter are accomplished by using the radio-frequency zero-crossing method: here, a momentum spread chirp is induced and the transverse beam profile in a downstream located dispersive section is measured with a scintillating screen providing an upper limit of the bunch length. Since this method is time consuming, a new setup for these measurements using a streak camera is developed. Optical transition radiation from an aluminum-coated Kapton target is used to map the bunch length information to a light pulse which enables an accurate measurement compared to a scintillating screen. The light pulse can then be evaluated with the streak camera by projecting its length onto the transverse dimension on a phosphor screen. This contribution will present the current status of the measurement setup as well as its design and properties. Michaela Arnold et al., Phys. Rev. Acc. Beams 23, 020101 (2020). **F. Schliessmann et al., Nat. Phys. 19, 597-602 (2023).
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP009
About •	Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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TUP010	Intermediate Frequency Circuit Components for Integration of on-Chip Amplifier With THz Detectors	detector, electron, electronics, GUI	204
	R. Yadav, S. Preu IMP, TU Darmstadt, Darmstadt, Germany A. Penirschke THM, Friedberg, Germany
	Funding: The work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05K22RO1 for applications at HZDR, Dresden, LAS at KIT and DELTA at TU Dortmund. The Zero-Bias Schottky Diode (ZBSD) and field effect transistor (TeraFET) based Terahertz (THz) detectors be- come more and more important for beam diagnosis and alignment at THz generating accelerator facilities. The roll- off factor of the detectors at higher THz frequencies requires wide-band amplifiers to enhance the IF signal from a few µW to nW well above the noise floor of the following post detection electronics. Connecting external amplifiers to the detectors via rf cables would enhance the signal losses even further and degrade the signal to noise ratio (SNR). In order to maximize the SNR, it is necessary to have on-chip amplifier integrated in the intermediate frequency (IF) circuit of the detector in the same housing. In this work, we present the design and parametric analysis of components for transition to an IF circuit, which will be integrated in the ZBSD and TeraFET on chip with amplifier in the same housing. The design analysis has been done to find the optimal parameters. The broader IF circuit will enhance the detector resolution to capture pulses in the picosecond range with the help of fast post detection electronics. [] R. Yadav et al., doi:10.3390/s23073469 [] S. Preu et al., doi:10.1109/TTHZ.2015.2482943 [**] A. Penirschke et al., doi:10.1109/IRMMW-THz.2014.6956027
	Poster TUP010 [1.453 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP010
About •	Received ※ 11 September 2023 — Revised ※ 12 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 26 September 2023
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TUP041	APS Upgrade Radiation Safety Beam Current Interlock	FPGA, controls, timing, radiation	281
	R.T. Keane, K.C. Harkay, N. Sereno ANL, Lemont, Illinois, USA A. Caracappa, C. Danneil, K. Ha, J. Mead, D. Padrazo BNL, Upton, New York, USA
	Funding: Work supported by U. S. Department of Energy Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357 The Advanced Photon Source upgrade (APS-U) Multi-Bend Acromat (MBA) storage ring utilizes on-axis swap-out injection requiring up to 20nC charge per electron bunch. Enforcement of radiation safety limits for the new storage ring will be accomplished by a new beam charge monitor interlock that accumulates beam charge measurements in the Booster-to-Storage ring (BTS) transfer line and disables injection when the charge limit over a preset time period is exceeded. The new interlock is based on the existing APS Beam Shut-Off Current Monitor (BESOCM), and incorporates significant improvements over the existing system. New features include use of direct digitization and FPGA processing, extensive remote monitoring capabilities, expanded self-test and fail-safe functions, and the ability to adjust settings and monitor status remotely via EPICS. The new device integrates a test pulse (self-check) feature that verifies the integrity of the integrating beam current transformer (ICT) and cable system used to detect the beam signal. This paper describes the new BTS interlock (BESOCM) design and presents results of bench test and in-machine evaluation of the prototype and production units.
	Poster TUP041 [1.731 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP041
About •	Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023
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TUP045	Real Time Momentum Spread Measurement of the CERN Antiproton Decelerator Beam	real-time, diagnostics, hardware, software	293
	P. Freyermuth, B. Dupuy, D. Gamba CERN, Meyrin, Switzerland
	Constant optimisation and diagnostics of the cooling processes in the CERN antiproton decelerator (AD) relies on a de-bunched beam momentum spread real time measurement. This article will describe the renovation of the acquisition chain of the longitudinal Schottky diagnostics in the AD, using standard CERN hardware and software to maximize reliability, ease maintenance, and meet the requirements for standard operational tools. The whole chain, from the pick-up to the operation software applications will be described with emphasis on the implementation of the data processing running on the front-end computer. Limitations will also be discussed and outlook for further development given.
	Poster TUP045 [21.199 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP045
About •	Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023
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WE3C03	Radiation Hard Beam Profile Monitors for the North Experimental Beamlines CERN	radiation, detector, ECR, experiment	321
	E. Buchanan European Organization for Nuclear Research (CERN), Geneva, Switzerland J. Cenede, S. Deschamps, W. Devauchelle, A. Frassier, J.N.G. Kearney, R.G. Larsen, I. Ortega Ruiz CERN, Meyrin, Switzerland
	A new radiation hard profile monitor is being researched and developed for the North Area Beamlines at CERN. The monitor must have a spatial resolution of 1 mm or less, an active area of 20 x 20 cm, a low material budget (~0.3%) and be operational in a beam that has a maximum rate of ~2x10¹¹ p/s in the full energy range of 0.5 ¿ 450 GeV/c. The current focus is the study of different detection mediums: silica optical fibres (Cherenkov radiation), glass capillaries filled with liquid scintillator, and hollow core optical fibres filled with scintillation gasses. Prototypes of the different fibre candidates have been tested with an Ultra-High Dose Rate electron beam, a low intensity hadron beam and will be tested with a high intensity hadron beam during summer 2023. The key properties to compare between the different fibres are the light yield and radiation tolerance. In parallel, the performance of the fibres is being tested for their compatibility of use for FLASH medical therapy applications.
	Slides WE3C03 [4.294 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3C03
About •	Received ※ 29 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 18 September 2023
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WEP030	First Results for a 50 MeV Beam Induced Fluorescence Monitor for Beam Profile Measurements	experiment, neutron, vacuum, diagnostics	418
	G.B. Rosenthal, J.I. Anderson, A. Cao, E. Cramer, T. Gordon, K. Kuhn, O.O. Ledezma Vazquez, J. Lopez, S. Lynam, J.B. Ringuette, L. Szeto, J. Zhou Nusano, Valencia, CA, USA E.F. Dorman, R.C. Emery, B. Smith University of Washington Medical Center, Seattle, Washington, USA
	Nusano is developing a 50 MeV alpha (4He++) particle accelerator, primarily to produce medical radionuclides. The accelerator produces an average current of 3 mAe with 20 mAe average macro pulse current. This results in an average beam power of 75 kW, and an average beam power within the macro pulse of 500 kW. The beam profile at the exit of the DTL is approximately gaussian with a diameter (FWHM) of about 3 mm. Designing diagnostics for this beam is challenging, as any diagnostics that intercept beam will receive a very high heat load. A BIFM (Beam Induced Fluorescence Monitor) is being developed to measure beam profiles. Nitrogen gas is leaked into the beamline. Excitation of the nitrogen by beam particles is captured using an image intensifier. The signal generated is directly proportional to the beam current. A prototype system has been constructed and tested on a lower intensity alpha beam. First results indicate we can measure beam profile to a 100 µm accuracy. Production system is currently being designed. The Nusano accelerator can also accelerate 2H⁺, 3He++, 6Li3+, 7Li3+, and a few other heavier ions.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP030
About •	Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 01 October 2023
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WEP043	Upgrade of the ELBE Timing System	timing, hardware, software, controls	446
	M. Kuntzsch, M. Justus, A. Schwarz, K. Zenker HZDR, Dresden, Germany L. Krmpotić, U. Legat, Z. Oven, L. Perusko, U. Rojec Cosylab, Ljubljana, Slovenia
	The CW electron accelerator ELBE is in operation for more than two decades. The timing system has been patched several times in order to meet changing requirements. In 2019 the development of a new timing system based on Micro Research Finland Hardware has been started which is designed to unify the heterogeneous structure and to replace obsolete components. In spring 2023 the development of the software has been accomplished, which included the mapping of operation mode and different complex beam patterns onto the capabilities of the commercial platform. The system generates complex beam patterns from single pulse, to macro pulse and 26 MHz cw operation including special triggers for diagnostics and machine subsystems. The contribution will describe the path from requirements to development and commissioning of the new timing system at ELBE.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP043
About •	Received ※ 06 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023
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Paper

Title

Other Keywords

Page

MO2C03

Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth

feedback, synchrotron, controls, lattice

7

P.S. Kallakuri, A.R. Brill, J. Carwardine, L. Emery, N. Sereno
ANL, Lemont, Illinois, USA

Funding: Work supported by U. S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
The fast orbit feedback (FOFB) bandwidth for Advanced photon source upgrade (APS-U) will be DC-1 kHz and the synchrotron frequency will be between 100-560 Hz. This frequency overlap places coupled bunch mode 0 (CBM0) induced horizontal orbit motion inside the orbit feedback bandwidth, potentially affecting our ability to achieve beam stability goals. Longitudinal feedback kicker is not strong enough to damp CBM0 oscillations. We developed new beam-based feedback method to suppress CBM0 oscillations with low level RF phase as actuator. It uses existent FOFB framework with no changes to the feedback algorithm. Effectiveness of this method is verified using present APS operations lattice where synchrotron frequency is outside orbit feedback bandwidth*. In the present work, low alpha lattice is created to emulate APS-U setting where synchrotron frequency is inside the orbit feedback bandwidth. Experiments with this lattice successfully demonstrated CBM0 correction within FOFB bandwidth. Combined operation of orbit feedback and CBM0 correction is stable, and CBM0 oscillations are damped. We achieved better orbit motion suppression and corrector drive efforts are reduced as well.
* P. Kallakuri et al., ’Coupled bunch mode zero correction using orbit measurements and RF system phase feedback’, doi:10.1103/PhysRevAccelBeams.25.082801

Slides MO2C03 [1.326 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2C03

About •

Received ※ 14 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023

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MO3C04

A MTCA Based BPM-System for PETRA IV

electron, brilliance, electronics, controls

19

G. Kube, H.T. Duhme, J.L. Lamaack, F. Schmidt-Föhre, K. Wittenburg
DESY, Hamburg, Germany
A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, M.O. Oblak, P. Paglovec, B. Repič
I-Tech, Solkan, Slovenia

The PETRA IV project aims to upgrade the present PETRA III synchrotron into an ultra low-emittance source. The small emittances translate directly into much smaller beam sizes, thus imposing stringent requirements on the machine stability. In order to measure beam positions and control orbit stability to the level of 10% of beam size and divergence, a high resolution BPM system will be installed which consists of 788 individual monitors with the readout electronics based on MTCA.4. In order to fulfil the long-term drift requirement (< 1 micron over 7 days), several analog, digital and SW parts were taken from the Libera Brilliance⁺ and a new RTM module has been developed to be used as BPM electronics RFFE. In addition, its analogue RF switch matrix used for long-term stabilization was separated and placed close to the BPM pickup, hence enabling an additional stabilization of the RF cables. At present, a fully populated MTCA crate with 6 AMC boards for the readout of 12 BPMs is installed at PETRA III and is extensively being tested. This contribution summarizes the latest beam measurements, demonstrating the high performance of the BPM system and the external stabilization concept.

Slides MO3C04 [3.604 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C04

About •

Received ※ 06 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 02 October 2023

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MO3C05

Canadian Light Source Beam Position Visualization Tool

EPICS, network, controls, storage-ring

24

M. Bree, T. Batten, C.W. Stevens, J.M. Vogt
CLS, Saskatoon, Saskatchewan, Canada

The CLS Orbit Correction (OC) system acquires, collates, and publishes storage ring beam centroid position information from 48 beam position monitors (BPMs) at a rate of 1000 samples per second. We present a "Storage Ring Beam Position Visualization Tool" that computes and displays dynamic Fast Fourier Transforms (FFTs) and Cumulative Power Spectral Densities (CPSDs) for all BPMs in real-time using full resolution data. The computed FFTs and CPSDs can be plotted in various combinations and in waterfall plots that allow visualization of changes over long periods of time. In addition, correlations between all BPM channel combinations are computed and ranked. Data from any two BPM channels can be selected for plotting in two dimensions wherein correlations are visually apparent. Computed CPSDs are further binned and published in scalar EPICS PVs which are archived for further analysis. Preliminary results from the Beam Position Visualization Tool have proven useful in characterizing beam position noise at the CLS.

Slides MO3C05 [197.014 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO3C05

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Received ※ 17 July 2023 — Revised ※ 16 August 2023 — Accepted ※ 13 September 2023 — Issue date ※ 26 September 2023

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MOP011

Safety Considerations for Shield Door Control Systems

controls, PLC, GUI, cathode

59

H.A. Watkins, W.C. Barkley, C.D. Hatch, D. Martinez, D. Rai, E.I. Simakov
LANL, Los Alamos, New Mexico, USA

Funding: Los Alamos National Lab LDRD
The Accelerator Operations and Technology division is upgrading the control system for a 33-ton shield door that will be used when the Cathodes and RF Interactions in Extremes (CARIE) accelerator begins operations. The door was installed in the 1990¿s but safety standards such as ISO 13849-1 have since emerged which provide safety requirements and guidance on the principles for the design and integration of safety-related parts of a control system. Applying this standard, a safety controller, safety relays and a light curtain barrier have been added to eliminate injury and exposure of personnel to potential hazards during door operations.
LANL Report #: LA-UR-23-25064

Poster MOP011 [0.827 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP011

About •

Received ※ 31 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023

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MOP019

First Test with MicroTCA Based Cavity BPM Electronics for the European XFEL and FLASH

electron, cavity, electronics, FEL

70

B. Lorbeer, H.T. Duhme, I. Krouptchenkov, T. Lensch, D. Lipka, M. Werner
DESY, Hamburg, Germany

The European X-ray free-electron laser (E-XFEL) and the FLASH2020+ project for the free electron laser Hamburg (FLASH) at DESY in Hamburg, Germany foresee several machine upgrades in the years to come. At FLASH a whole undulator section in a shutdown starting in summer 2024 and finishing in autumn 2025 is going to be rebuild. Existing button beam position monitors installed in this section of the machine do not deliver sufficient signal strength for future required resolution specification and orbit feedback optimization for machine operation. The resolution limitations will be overcome by replacing the button-based beam position monitors with in-house developed cavity beam position monitors and compact microTCA based radio frequency receiver read-out electronics. The measurement system has been tested and evaluated in a test setup at FLASH.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP019

About •

Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 21 September 2023 — Issue date ※ 30 September 2023

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MOP023

The Conceptual Design Study for New BPM Signal Processing System of J-PARC (MR)

impedance, controls, network, FPGA

78

K. Satou, T. Toyama, S. Yamada
KEK, Tokai, Ibaraki, Japan

The BPM signal processing system, which is19 years old system, have been suffering from gain fluctuation due to contact resistance of the mechanical gain selector, communication disruption caused by an unstable contact of a card edge connector. In addition, it has a difficulty of repairments because some on-board parts have already reached end of product-life cycle, and some units have been in unusable situation. Presently, we are on the beam power upgrade campaign to 1.3 MW by increasing beam bunch current and shortening the MR operation cycle, and precise beam tunings would require massive waveform data processing and transfer to a storage than the present system. For this, we have been developing the system based on the 10 GbE optical link. The ADC board which is under development would perform direct sampling using the third harmonic of RF. The digital IQ demodulation technique is used to extract the baseband oscillation from the raw data. The obtained raw waveform as well as closed orbit data would be stored in the data storage system. In the presentation, we will report on the progress of development aimed at operation in 2025 and the conceptual design of the new system.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP023

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Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 19 September 2023

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MOP026

A Novel BPM Mechanical Center Calibration Method Based on Laser Ranging

laser, experiment, software, electronics

82

X.H. Tang, J.S. Cao, Y.Y. Du, J. He, Y.F. Sui, J.H. Yue
IHEP, Beijing, People’s Republic of China

Determining the mechanical center of the beam position monitor(BPM) has been a difficulty for BPM calibration. To solve this problem, a method of positioning the BPM mechanical center based on laser ranging is proposed. This method uses high-precision antenna support as the core locating datum, and high-precision laser ranging sensors(LRSs) as the detection tool. By detecting the distances from the LRSs to the antenna support and the distances from the LRSs to the BPM, the mechanical center of the BPM can be indirectly determined. The theoretical system error of this method is within 20¿m, and the experimental results show that the measurement repeatability is less than 40¿m, This method has low cost and fast speed, which can be used for large-scale calibration.

Poster MOP026 [1.142 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP026

About •

Received ※ 13 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023

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MOP033

1L Target Harp Diagnostic Display Tool

target, diagnostics, neutron, status

99

A.D. Walker, E.L. Kerstiens
LANL, Los Alamos, New Mexico, USA

The Los Alamos Neutron Science Center (LANSCE) completed upgrades to its 1L Target Facility, which included installing the new Mark IV target assembly. This added a third tungsten target located upstream of the other two targets. Prior to Mark IV, beam centering on target was achieved by using thermocouples mounted to the quadrants and center of the upper target coolant chamber. It is slightly offset from center of the old upper target and it shadows several of the thermocouples previously used to center beam on target. This required adjustments to the diagnostic tools utilized to monitor position of the H⁻ beam that is being delivered to the 1L target. The original display included the thermocouple readouts and displayed a visual beam profile and position taken from an upstream harp. With some of the thermocouples now being shadowed, an image overlay was added to show where the harp¿s measured beam position is relative to both the upper and middle targets. This gives the beam operations team an additional level of awareness when it comes to thermocouple temperatures, beam steering, and beam tuning. Details of the display tool and its associated upgrades are presented.
LANL Report #: LA-UR-23-25004

Poster MOP033 [0.825 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP033

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Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023

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MOP037

Tune Feedback at the Canadian Light Source

feedback, quadrupole, injection, storage-ring

106

W.A. Wurtz, C.K. Baribeau, A.M. Duffy
CLS, Saskatoon, Saskatchewan, Canada

In order to maintain good injection efficiency for top-up operation at the Canadian Light Source, we must keep the betatron tunes constant even as changes in insertion device fields cause the tunes to vary. To meet this requirement, we implemented a tune feedback system. We measure the tunes at a rate of 1 Hz using Dimtel bunch-by-bunch systems. The transverse feedback function of the bunch-by-bunch systems provides tune measurements without disturbing the electron beam. We adjust two quadrupole families at a rate of 0.25 Hz to control the horizontal and vertical tunes. In this article we describe the tune feedback system, its development and its performance. The system has proven to be very robust, enabling reliable top-up operation.

Poster MOP037 [1.284 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP037

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Received ※ 24 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 21 September 2023

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MOP043

Using Lag Compensator in Orbit Feedback

feedback, power-supply, vacuum, simulation

123

I. Pinayev
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
Growing demand on the beam orbit stability requires higher loop gain within the operational bandwidth. Increasing the gain leads to the increase of the unity gain frequency and creates problems with systems stability due to the additional phase shifts caused by the trims (power supplies, eddy currents in vacuum chambers, etc.) and filtering of beam position data. Conventionally employed systems have 20 dB/decade slope near the unity gain providing 90 degrees phase shift which is sufficient for stability. Utilizing one or more lag compensators allows to increase the gain at low frequencies while keeping phase margin acceptable. The paper provides more details on the proposed solution as well as simulations of how the transients will be modified.

Poster MOP043 [0.230 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP043

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Received ※ 25 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 23 September 2023

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MOP044

"Instantaneous" Lifetime Measurement in Storage Ring with Top-Up Injection

injection, storage-ring, electron, collider

125

I. Pinayev
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
Top-up operation becomes routine in the light sources. The goal of the top-up operation is to keep the current of the circulating beam stable to avoid variations of the heat load on the beamline optics. It is also considered for the electron-ion collider to maintain the polarization of the electron beam. Frequent re-injection makes measurement of the beam lifetime very difficult if possible. Since, only part of the bunch train is refreshed during the injection cycle then the distribution of the bunch charges in the train has a characteristic saw-tooth distribution. The slope of saw tooth and step in the bunch charge distribution is defined by the lifetime and filling frequency. Both parameters can be used for the measurement. The data for processing can be obtained either from fast current transformer or from the raw ADC signal from beam position monitor. In this paper we present the theoretical considerations as well as experimental data from NSLS-II storage ring.

Poster MOP044 [0.284 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP044

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Received ※ 25 August 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 18 September 2023

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TU2I02

First Direct Measurement of Electron and Positron Bunch Characteristics during Positron Capture Process at the Positron Source of the SuperKEKB B-Factory

positron, target, electron, factory

146

T. Suwada
KEK, Ibaraki, Japan

Electron (e-) and positron (e+) bunch characteristics were directly measured for the first time using wideband beam monitors (WBMs) and a detection system at the e⁺ source of the SuperKEKB B-factory. Both secondarily-generated e^- and e⁺ bunches after the e±production target were clearly identified in their dynamical capture process at locations of the WBMs under two-bunch acceleration scheme. Not only the longitudinal but also transverse bunch characteristics, the time intervals between the e^- and e⁺ bunches, the bunch lengths, transverse bunch positions, and bunch charges were simultaneously separately measured for each bunch as functions of the capture phase to investigate their dynamical capture process. The results show that quite symmetric dynamical behaviors for the e^- and e⁺ bunch characteristics were clearly observed. The new WBMs open up a new window for direct measurements of both the e^- and e⁺ bunches during their dynamical capture process and in the optimization procedure of the e⁺ bunch intensity in multidimensional parameter spaces at any e⁺ sources. The historical backgrounds for introducing and implementing the new WBMs are also described in this report.

Slides TU2I02 [2.925 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2I02

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Received ※ 07 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023

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TU3C02

FPGA Architectures for Distributed ML Systems for Real-Time Beam Loss De-Blending

network, real-time, distributed, FPGA

160

M.A. Ibrahim, J.M.S. Arnold, M.R. Austin, J.R. Berlioz, P.M. Hanlet, K.J. Hazelwood, J. Mitrevski, V.P. Nagaslaev, A. Narayanan, D.J. Nicklaus, G. Pradhan, A.L. Saewert, B.A. Schupbach, K. Seiya, R.M. Thurman-Keup, N.V. Tran
Fermilab, Batavia, Illinois, USA
J.YC. Hu, J. Jiang, H. Liu, S. Memik, R. Shi, A.M. Shuping, M. Thieme, C. Xu
Northwestern University, EVANSTON, USA

Funding: Operated by Fermi Research Alliance, LLC under Contract No.DE-AC02-07CH11359 with the United States Department of Energy. Additional funding provided by Grant Award No. LAB 20-2261 [1]
The Real-time Edge AI for Distributed Systems (READS) project’s goal is to create a Machine Learning (ML) system for real-time beam loss de-blending within the accelerator enclosure, which houses two accelerators: the Main Injector (MI) and the Recycler (RR). In periods of joint operation, when both machines contain high intensity beam, radiative beam losses from MI and RR overlap on the enclosure¿s beam loss monitoring (BLM) system, making it difficult to attribute those losses to a single machine. Incorrect diagnoses result in unnecessary downtime that incurs both financial and experimental cost. The ML system will automatically disentangle each machine¿s contributions to those measured losses, while not disrupting the existing operations-critical functions of the BLM system. Within this paper, the ML models, used for learning both local and global machine signatures and producing high quality inferences based on raw BLM loss measurements, will only be discussed at a high-level. This paper will focus on the evolution of the architecture, which provided the high-frequency, low-latency collection of synchronized data streams to make real-time inferences.
Performed at Northwestern with support from the Departments of Computer Science and Electrical and Computer Engineering

Slides TU3C02 [17.830 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C02

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Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 25 September 2023

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TU3C03

Collimator Scan Based Beam Halo Measurements in LHC and HL-LHC

betatron, luminosity, emittance, collimation

164

P.D. Hermes, M. Giovannozzi, C.E. Montanari, S. Morales Vigo, S. Redaelli, B. Salvachúa
CERN, Meyrin, Switzerland
M. Rakic
EPFL, Lausanne, Switzerland

Measurements in the CERN Large Hadron Collider (LHC) have indicated that the population of the transverse beam halo is greater than that of a Gaussian distribution. With the upcoming High Luminosity upgrade (HL-LHC), the stored beam energy in the beam halo could become large enough to threaten the integrity of the collimation system. Considerable efforts during the ongoing LHC Run 3 are dedicated to characterising the transverse beam halo, and its diffusion properties, after the LHC Injector Upgrade (LIU) in preparation for HL-LHC operation. Given the unprecedented stored beam energies of about 400MJ, presently achieved at the LHC, and about 700MJ planned at the HL-LHC, conventional measurements are difficult. Halo and diffusion measurements are currently based on collimator scans, where robust collimators are inserted in steps into the circulating beam halo. In this contribution, we present techniques for halo characterisation employed in LHC and compare results obtained from such measurements in LHC Run 2 and the ongoing LHC Run 3. We present plans for measurements in the remainder of LHC Run 3 and describe expected challenges for halo quantification in HL-LHC.

Slides TU3C03 [5.876 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3C03

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Received ※ 05 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 12 September 2023

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TUP002

Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings

luminosity, feedback, detector, vacuum

179

M. Tobiyama, H. Ikeda, G. Mitsuka
KEK, Ibaraki, Japan

In the SuperKEKB rings, we have encountered extremely-fast beam losses occurring primarily within one to two turns in some parts of the bunch train. Such ¿sudden beam loss¿ induced severe failure in the vertical collimator heads, quenches on the superconducting final quadrupoles, and damage on the Belle II detector in some cases. Thus it is essential to investigate the cause and take countermeasures. This paper presents the phenomena clarified by the bunch current and position monitor of the bunch feedback system. The upgrade plan for the existing monitor, and recently developed simple monitors installed in the suspected area is also introduced.

Poster TUP002 [0.727 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP002

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Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023

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TUP009

Bunch Length Measurement System Downstream the Injector of the S-DALINAC

linac, optics, electron, radiation

200

A. Brauch, M. Arnold, M. Dutine, J. Enders, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, D. Schneider
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by the State of Hesse within the Cluster Project ELEMENTS (Project ID 500/10.006) and by DFG (GRK 2128 AccelencE).
The S-DALINAC is a thrice recirculating electron accelerator for high resolution electron scattering experiments with a continuous-wave beam at a frequency of 2.9972(1) GHz. Short bunches are crucial to enable tuning of the machine for operation as an energy-recovery linear accelerator* **. Currently, measurements of this beam parameter are accomplished by using the radio-frequency zero-crossing method: here, a momentum spread chirp is induced and the transverse beam profile in a downstream located dispersive section is measured with a scintillating screen providing an upper limit of the bunch length. Since this method is time consuming, a new setup for these measurements using a streak camera is developed. Optical transition radiation from an aluminum-coated Kapton target is used to map the bunch length information to a light pulse which enables an accurate measurement compared to a scintillating screen. The light pulse can then be evaluated with the streak camera by projecting its length onto the transverse dimension on a phosphor screen. This contribution will present the current status of the measurement setup as well as its design and properties.
*Michaela Arnold et al., Phys. Rev. Acc. Beams 23, 020101 (2020).
**F. Schliessmann et al., Nat. Phys. 19, 597-602 (2023).

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP009

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Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023

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TUP010

Intermediate Frequency Circuit Components for Integration of on-Chip Amplifier With THz Detectors

detector, electron, electronics, GUI

204

R. Yadav, S. Preu
IMP, TU Darmstadt, Darmstadt, Germany
A. Penirschke
THM, Friedberg, Germany

Funding: The work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05K22RO1 for applications at HZDR, Dresden, LAS at KIT and DELTA at TU Dortmund.
The Zero-Bias Schottky Diode (ZBSD) and field effect transistor (TeraFET) based Terahertz (THz) detectors be- come more and more important for beam diagnosis and alignment at THz generating accelerator facilities. The roll- off factor of the detectors at higher THz frequencies requires wide-band amplifiers to enhance the IF signal from a few µW to nW well above the noise floor of the following post detection electronics. Connecting external amplifiers to the detectors via rf cables would enhance the signal losses even further and degrade the signal to noise ratio (SNR). In order to maximize the SNR, it is necessary to have on-chip amplifier integrated in the intermediate frequency (IF) circuit of the detector in the same housing. In this work, we present the design and parametric analysis of components for transition to an IF circuit, which will be integrated in the ZBSD and TeraFET on chip with amplifier in the same housing. The design analysis has been done to find the optimal parameters. The broader IF circuit will enhance the detector resolution to capture pulses in the picosecond range with the help of fast post detection electronics.
[*] R. Yadav et al., doi:10.3390/s23073469
[**] S. Preu et al., doi:10.1109/TTHZ.2015.2482943
[***] A. Penirschke et al., doi:10.1109/IRMMW-THz.2014.6956027

Poster TUP010 [1.453 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP010

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Received ※ 11 September 2023 — Revised ※ 12 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 26 September 2023

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TUP041

APS Upgrade Radiation Safety Beam Current Interlock

FPGA, controls, timing, radiation

281

R.T. Keane, K.C. Harkay, N. Sereno
ANL, Lemont, Illinois, USA
A. Caracappa, C. Danneil, K. Ha, J. Mead, D. Padrazo
BNL, Upton, New York, USA

Funding: Work supported by U. S. Department of Energy Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
The Advanced Photon Source upgrade (APS-U) Multi-Bend Acromat (MBA) storage ring utilizes on-axis swap-out injection requiring up to 20nC charge per electron bunch. Enforcement of radiation safety limits for the new storage ring will be accomplished by a new beam charge monitor interlock that accumulates beam charge measurements in the Booster-to-Storage ring (BTS) transfer line and disables injection when the charge limit over a preset time period is exceeded. The new interlock is based on the existing APS Beam Shut-Off Current Monitor (BESOCM), and incorporates significant improvements over the existing system. New features include use of direct digitization and FPGA processing, extensive remote monitoring capabilities, expanded self-test and fail-safe functions, and the ability to adjust settings and monitor status remotely via EPICS. The new device integrates a test pulse (self-check) feature that verifies the integrity of the integrating beam current transformer (ICT) and cable system used to detect the beam signal. This paper describes the new BTS interlock (BESOCM) design and presents results of bench test and in-machine evaluation of the prototype and production units.

Poster TUP041 [1.731 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP041

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Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023

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TUP045

Real Time Momentum Spread Measurement of the CERN Antiproton Decelerator Beam

real-time, diagnostics, hardware, software

293

P. Freyermuth, B. Dupuy, D. Gamba
CERN, Meyrin, Switzerland

Constant optimisation and diagnostics of the cooling processes in the CERN antiproton decelerator (AD) relies on a de-bunched beam momentum spread real time measurement. This article will describe the renovation of the acquisition chain of the longitudinal Schottky diagnostics in the AD, using standard CERN hardware and software to maximize reliability, ease maintenance, and meet the requirements for standard operational tools. The whole chain, from the pick-up to the operation software applications will be described with emphasis on the implementation of the data processing running on the front-end computer. Limitations will also be discussed and outlook for further development given.

Poster TUP045 [21.199 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP045

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Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023

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WE3C03

Radiation Hard Beam Profile Monitors for the North Experimental Beamlines CERN

radiation, detector, ECR, experiment

321

E. Buchanan
European Organization for Nuclear Research (CERN), Geneva, Switzerland
J. Cenede, S. Deschamps, W. Devauchelle, A. Frassier, J.N.G. Kearney, R.G. Larsen, I. Ortega Ruiz
CERN, Meyrin, Switzerland

A new radiation hard profile monitor is being researched and developed for the North Area Beamlines at CERN. The monitor must have a spatial resolution of 1 mm or less, an active area of 20 x 20 cm, a low material budget (~0.3%) and be operational in a beam that has a maximum rate of ~2x10¹¹ p/s in the full energy range of 0.5 ¿ 450 GeV/c. The current focus is the study of different detection mediums: silica optical fibres (Cherenkov radiation), glass capillaries filled with liquid scintillator, and hollow core optical fibres filled with scintillation gasses. Prototypes of the different fibre candidates have been tested with an Ultra-High Dose Rate electron beam, a low intensity hadron beam and will be tested with a high intensity hadron beam during summer 2023. The key properties to compare between the different fibres are the light yield and radiation tolerance. In parallel, the performance of the fibres is being tested for their compatibility of use for FLASH medical therapy applications.

Slides WE3C03 [4.294 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE3C03

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Received ※ 29 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 18 September 2023

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WEP030

First Results for a 50 MeV Beam Induced Fluorescence Monitor for Beam Profile Measurements

experiment, neutron, vacuum, diagnostics

418

G.B. Rosenthal, J.I. Anderson, A. Cao, E. Cramer, T. Gordon, K. Kuhn, O.O. Ledezma Vazquez, J. Lopez, S. Lynam, J.B. Ringuette, L. Szeto, J. Zhou
Nusano, Valencia, CA, USA
E.F. Dorman, R.C. Emery, B. Smith
University of Washington Medical Center, Seattle, Washington, USA

Nusano is developing a 50 MeV alpha (4He++) particle accelerator*, primarily to produce medical radionuclides. The accelerator produces an average current of 3 mAe with 20 mAe average macro pulse current. This results in an average beam power of 75 kW, and an average beam power within the macro pulse of 500 kW. The beam profile at the exit of the DTL is approximately gaussian with a diameter (FWHM) of about 3 mm. Designing diagnostics for this beam is challenging, as any diagnostics that intercept beam will receive a very high heat load. A BIFM (Beam Induced Fluorescence Monitor) is being developed to measure beam profiles. Nitrogen gas is leaked into the beamline. Excitation of the nitrogen by beam particles is captured using an image intensifier. The signal generated is directly proportional to the beam current. A prototype system has been constructed and tested on a lower intensity alpha beam. First results indicate we can measure beam profile to a 100 µm accuracy. Production system is currently being designed.
* The Nusano accelerator can also accelerate 2H⁺, 3He++, 6Li3+, 7Li3+, and a few other heavier ions.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP030

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Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 01 October 2023

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WEP043

Upgrade of the ELBE Timing System

timing, hardware, software, controls

446

M. Kuntzsch, M. Justus, A. Schwarz, K. Zenker
HZDR, Dresden, Germany
L. Krmpotić, U. Legat, Z. Oven, L. Perusko, U. Rojec
Cosylab, Ljubljana, Slovenia

The CW electron accelerator ELBE is in operation for more than two decades. The timing system has been patched several times in order to meet changing requirements. In 2019 the development of a new timing system based on Micro Research Finland Hardware has been started which is designed to unify the heterogeneous structure and to replace obsolete components. In spring 2023 the development of the software has been accomplished, which included the mapping of operation mode and different complex beam patterns onto the capabilities of the commercial platform. The system generates complex beam patterns from single pulse, to macro pulse and 26 MHz cw operation including special triggers for diagnostics and machine subsystems. The contribution will describe the path from requirements to development and commissioning of the new timing system at ELBE.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP043

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Received ※ 06 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 01 October 2023

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