Keyword: controls
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MO2I02 Fast Orbit Feedback for Diamond-II storage-ring, feedback, simulation, electron 1
  • I. Kempf, M.G. Abbott, L. Bobb, G.B. Christian
    DLS, Harwell, United Kingdom
  • S. Duncan
    University of Oxford, Oxford, United Kingdom
  • G. Rehm
    HZB, Berlin, Germany
  Funding: Diamond Light Source and Engineering and Physical Sciences Research Council
The electron beam stability is critical for 4th generation light sources. As opposed to 10% of beam size up to 140 Hz at Diamond, advances in detector speed and resolution at Diamond-II increase the stability requirements to 3% up to 1 kHz. This paper presents a novel control methodology for the fast orbit feedback at Diamond-II, which will stabilise the beam using two arrays of 252 slow and 144 fast correctors and 252 beam position monitors at 100 kHz. In contrast to existing approaches that separate slow and fast feedback loops, our approach is based on a two-matrix factorisation called the generalised singular value decomposition (GSVD), which decouples the system into 144 two-input modes controlled by slow and fast magnets and 108 modes controlled by slow magnets only. The GSVD-based controller is implemented in the existing Diamond storage ring using a centralised communication architecture, such as planned for Diamond-II. We present results from the Diamond storage ring and simulation, which confirm that the proposed approach meets the target specification for Diamond-II.
slides icon Slides MO2I02 [3.686 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2I02  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 18 September 2023
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MO2C03 Coupled Bunch Mode Zero Correction within the Orbit Feedback Bandwidth feedback, operation, synchrotron, 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 icon 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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MO2C04 SOLEIL New Platform for Fast Orbit Feedback FPGA, electron, electronics, feedback 11
  • R. Bronès, A. Bence, J. Bisou, N. Hubert, D. Pédeau, G. Pichon
    SOLEIL, Gif-sur-Yvette, France
  SOLEIL is upgrading its Fast Orbit Feedback platform to withstand coming obsolescence of electronic BPM and future evolutions of the machine. This new platform has to be compatible with current boundary devices such as BPM electronics or corrector power supplies, but it also shall evolve to interface future versions of these systems. A MTCA based platform was designed and installed. It is integrated in the control system by mean of a OPCUA server, and care has been taken to seamlessly toggle the closing of the feedback loop on the former or new FOFB platform. This paper will present the first tests and results conducted to commission this new system.  
slides icon Slides MO2C04 [30.176 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MO2C04  
About • Received ※ 06 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 26 September 2023 — Issue date ※ 01 October 2023
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MO3C04 A MTCA Based BPM-System for PETRA IV electron, brilliance, electronics, operation 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 icon 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, operation, 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 icon 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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MOP001 Current Status of the HESR Beam Instrumentation vacuum, pick-up, instrumentation, antiproton 29
  • C. Böhme
    FZJ, Jülich, Germany
  • A.J. Halama, V. Kamerdzhiev, G.K. Koch, K. Laihem, K. Reimers
    GSI, Darmstadt, Germany
  The High Energy Storage Ring (HESR), within the FAIR project, will according to current planning provide anti-proton beams for PANDA and heavy ion beams for i.a. the SPARC experiment. Manufacturing for most of the envisaged beam instrumentation devices in vacuum is completed and testing is well underway. The overall status update of the beam instrumentation devices is presented, with a focus on the test-bench results of the BPMs. In addition, the planned future timeline of the HESR beam instrumentation is briefly reported.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP001  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 18 September 2023
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MOP011 Safety Considerations for Shield Door Control Systems operation, 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 icon 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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MOP023 The Conceptual Design Study for New BPM Signal Processing System of J-PARC (MR) impedance, operation, 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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MOP030 Developments of 4GSR BPM Electronics electronics, electron, storage-ring, feedback 87
  • S.W. Jang, G. Hahn, J.Y. Huang, C. Kim, D. Kim, G. Kim, B.K. Shin, D.C. Shin, D. Song
    PAL, Pohang, Republic of Korea
  • W.J. Song
    POSTECH, Pohang, Republic of Korea
  The emittance of the 4th-generation storage ring (4GSR) to be constructed in Cheongju-Ochang, Korea, is expected to be approximately 100 times smaller than the existing 3rd-generation storage ring. With the decrease in emittance, more precise beam stabilization is required. To meet this requirement, the resolution of the beam position monitor (BPM) system also needs to be further improved. We have conducted research and development on the electronics of the BPM system for the 4GSR storage ring. In order to perform fast orbit feedback in the 4GSR storage ring, we need to acquire turn-by-turn beam position data, with a desired beam position resolution of 1 ¿m. Additionally, prototypes of the bunch-by-bunch monitoring system are being developed for the transverse feedback system and longitudinal feedback system. The internally developed electronics are intended to be modified for future use as monitors for multi-bunch beam energy measurements at the end of the linear accelerator, by adjusting the logic accordingly. In this presentation, we will describe more details of the current status of the development of the beam position monitor electronics for the 4GSR in Korea.  
poster icon Poster MOP030 [24.607 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP030  
About • Received ※ 05 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 19 September 2023
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MOP038 Development of an Active Beam-Stabilization System for Electrofission Experiments at the S-Dalinac electron, linac, target, experiment 111
  • D. Schneider, M. Arnold, U. Bonnes, A. Brauch, M. Dutine, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, G. Steinhilber
    TU Darmstadt, Darmstadt, Germany
  Funding: Work supported by DFG (GRK 2128), BMBF (05H21RDRB1), the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006) and the LOEWE Research Group Nuclear Photonics.
The r-process fission cycle terminates the natural synthesis of heavy elements in binary neutron-star mergers. Fission processes of transuranium nuclides will be studied in electrofission reactions at the S-DALINAC*. Due to the minuscule fissile target, the experimental setup requires an active electron-beam-stabilization system with high accuracy and a beam position resolution in the submillimeter range. In this contribution, requirements and concepts of this system regarding beam-diagnostic elements, feedback control and readout electronics are presented. The usage of a beam position monitor cavity and optical transition radiation targets to monitor the required beam parameters will be discussed in detail. Additionally, various measurements performed at the S-DALINAC to assess requirements and limits for the beam-stabilization system will be presented. Finally, the option of using advanced machine learning methods such as neural networks and agent-based reinforcement learning will be discussed.
*N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)
poster icon Poster MOP038 [1.526 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP038  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 23 September 2023
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MOP041 Modified Fast Orbit Feedback Controller for Disturbance Attenuation in Long Straights for Diamond-II simulation, target, electron, feedback 119
  • S. Banerjee, M.G. Abbott, L. Bobb, I. Kempf
    DLS, Harwell, United Kingdom
  • I. Kempf
    University of Oxford, Oxford, United Kingdom
  At Diamond Light Source, the fast orbit feedback (FOFB) uses one array of correctors and the controller is designed using the internal model control (IMC) structure. The Diamond-II upgrade will introduce an additional array of fast correctors and a new controller that is designed using the generalised modal decomposition, increasing the overall closed-loop bandwidth from 140 Hz to 1 kHz. Although simulation results have shown that the resulting beam displacement is within specification in all straights, they have also shown that the performance on long straights is limited, particularly in the vertical plane. In this paper, the controller is tuned in order to increase the FOFB performance in long straights by introducing a mode-by-mode regularisation parameter. The performance of the controller beyond 1 kHz is assessed using new disturbance data and a new measurement noise model, showing that the Diamond-II performance criteria are met, even in the presence of measurement noise.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP041  
About • Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
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TUP021 Development of the RF Phase Shifter with Femtosecond Time Delay Resolution for the PAL-XFEL Laser System laser, FEL, experiment, detector 222
  • D.C. Shin, H.-S. Kang, G. Kim, C.-K. Min, G. Mun
    PAL, Pohang, Republic of Korea
  We introduce the RF Phase Shifter (RPS) developed in the Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) to control the timing of optical laser system. This equipment is designed to finely adjust the timing of laser pulses with femtosecond scale by manipulating the phase of the RF reference using a couple of Direct Digital Synthesizer (DDS) devices. Furthermore, it is designed with low phase noise and low phase drift features in order to minimize the impact on the system in an open-loop operation. Currently these units are installed at the Injection site, Hard X-ray and Soft X-ray Beamline. They are implemented for the feedback control of the photocathode gun phase at the Injector and for the use in pump-probe experiments at the Beamlines. This paper describes the design, fabrication, and experimental results of the RPS, as well as its usage status at PAL-XFEL.  
poster icon Poster TUP021 [1.194 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP021  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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TUP029 A Hybrid Approach to Upgrade Hardware for the Proton Storage Ring Fast Kicker kicker, hardware, proton, storage-ring 250
  • T. Ramakrishnan, J.I. Duran, H.A. Watkins
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25123
The Los Alamos Neutron Science Center (LANSCE) Proton Storage Ring (PSR) needs precise timing to ensure successful extraction of the bunched protons. The current control system¿s hardware is obsolete and unmaintainable. The task was to replace the 1980¿s era CAMAC control and timing system for the PSR extraction kickers. This included a system which halts charging of the kickers after a duration without firing to prevent equipment damage. A hybrid approach was taken to integrate a Berkeley Nucleonics Corporation (BNC) pulse generator that was controlled by a soft input/output controller (IOC) and National Instrument compact Reconfigurable Input/Output (cRIO) IOC. This allowed for flexibility and modularity of the software and hardware development. This approach built the framework to streamline robust deployment of hybrid systems and develop a solution for upgrades of other LANSCE kickers.
poster icon Poster TUP029 [0.679 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP029  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 18 September 2023
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TUP031 Beam Test of a Harmonic Kicker Cavity cavity, kicker, electron, collider 254
  • M.W. Bruker, J.M. Grames, J. Guo, J. Musson, S.A. Overstreet, G.-T. Park, T.E. Plawski, M. Poelker, R.A. Rimmer, H. Wang, C.M. Wilson, S. Zhang
    JLab, Newport News, Virginia, USA
  • M.H. Pablo, B.F. Roberts, D. Speirs
    Electrodynamic, Albuquerque, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-AC05-06OR23177. Multi-Harmonic driver development supported by SBIR DE-SC0020566.
A harmonically resonant kicker cavity designed for beam exchange in a circulator cooler* was built and successfully tested at the Upgraded Injector Test Facility (UITF) at Jefferson Lab. This type of cavity is being considered for the injection scheme of the Rapid Cycling Synchrotron at the Electron-Ion Collider, where the spacing of neighboring bunches demands very short kicks. Operating with five transversely deflecting modes simultaneously that resonate at 86.6 MHz and consecutive odd harmonics thereof, the prototype cavity selectively deflects 1 of 11 electron bunches while leaving the others unperturbed. An RF driver was developed to synthesize phase- and amplitude-controlled harmonic signals and combine them to drive the cavity while also separating the modes from a field-probe antenna for RF feedback and dynamic tuning. Beam deflection was measured by sweeping the cavity phase; the deflection waveform agrees with expectations, having sub-nanosecond rise and fall times. No emittance increase is observed. Harmonically resonant cavities like the one described provide a new capability for injection and extraction at circulators and rings.
* G.T. Park et al., "Beam exchange of a circulator cooler ring with an ultrafast harmonic kicker", Phys. Rev. Accel. Beams 24, 061002
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP031  
About • Received ※ 14 July 2023 — Revised ※ 09 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 27 September 2023
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TUP041 APS Upgrade Radiation Safety Beam Current Interlock FPGA, operation, 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 icon 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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TUP044 The Digital Signal Processing Chain of the CERN LIU BWS FPGA, interface, timing, instrumentation 288
  • D. Belohrad
    European Organization for Nuclear Research (CERN), Geneva, Switzerland
  • J. Emery, J.C. Esteban Felipe, A. Goldblatt, A. Guerrero, M. Martin Nieto, F. Roncarolo
    CERN, Meyrin, Switzerland
  Between 2019 and 2023, as part of the LHC Injectors Upgrade (LIU), a major renovation of the CERN wire scanners (BWS) was performed. The main driving force was to prepare the wire scanners for the High-Luminosity LHC (HL-LHC), during which the instantaneous luminosity is expected to double, to around 5× 1034cm-2s-1. In 2021 seventeen LIU BWSs were installed in the CERN PS complex and the SPS. Additionally, two BWSs were installed in the LHC, at the end of 2022, to be ready for the 2023 LHC run. The aim of the contribution is to describe in detail the technical implementation of the digital signal acquisition (DAQ) and data processing of the newly installed BWSs. Particular attention is given to the design of the analogue front-end, signal conversion, and data processing chain ¿ providing raw data for the profile reconstruction. The synchronisation of the incoming digitised signal with the machine timing is also a focus point, as it differs significantly between the PS complex on the one hand and the LHC and SPS on the other hand. In conclusion we present beam measurements, and discuss the limitations of the algorithms used.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP044  
About • Received ※ 08 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 15 September 2023
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TUP046 Status of the RFSoC-based Signal Processing for Multi-bunch and Filling Pattern Feedbacks in the SLS 2.0 feedback, storage-ring, software, real-time 297
  • P.H. Baeta Neves Diniz Santos
    PSI, Villigen PSI, Switzerland
  Having effectively evaluated the RF System-On-Chip (RFSoC) as a suitable technology for the SLS2.0 Filling Pattern Feedback (FPFB) and Multi-bunch Feedback (MBFB) [1], our current focus lies in realizing and expanding the required real-time Digital Signal Processing (DSP) algorithms on an RFSoC evaluation board. This contribution outlines the present status of our feedback systems, including recent outcomes derived from testing prototypes both in the laboratory and with beam signals at the storage ring.
[1] P. Baeta et al., "RF System-on-Chip for Multi-Bunch and Filling-Pattern Feedbacks," Proc. IBIC’22
poster icon Poster TUP046 [1.201 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP046  
About • Received ※ 30 August 2023 — Revised ※ 09 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 29 September 2023
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WE2C02 Software Defined Radio Based Feedback System for Transverse Beam Excitation feedback, extraction, software, detector 306
  • P.J. Niedermayer, R.N. Geißler, R. Singh
    GSI, Darmstadt, Germany
  Funding: This project has received funding from the European Union¿s Horizon 2020 Research and Innovation programme under GA No 101004730.
Controlling stored beams in particle accelerators requires specially designed RF signals, such as needed for spill control via transverse excitation. The software-defined radio (SDR) technology is adopted as a low cost, yet highly flexible setup to generate such signals in the kHz to MHz regime. A feedback system is build using a combination of digital signal processing with GNU Radio and RF Network-on-Chip (RFNoC) on a Universal Software Radio Peripheral (USRP). The system enables digitization of signals from particle detectors and direct tuning of the produced RF waveforms via a feedback controller – implemented on a single device. To allow for triggered operation and to reduce the loop delay to a few ms, custom OOT and RFNoC blocks have been implemented. This contribution reports on the implementation and first test results with beam of the developed spill control system.
slides icon Slides WE2C02 [2.683 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE2C02  
About • Received ※ 05 September 2023 — Revised ※ 12 September 2023 — Accepted ※ 15 September 2023 — Issue date ※ 30 September 2023
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WEP007 Beam Profile Measurement using Helium Gas Light Emission and BEPM for Superheavy Element Search Experiment target, experiment, optics, quadrupole 343
  • T. Watanabe, O. Kamigaito, T. Nishi, A. Uchiyama
    RIKEN Nishina Center, Wako, Japan
  • T. Adachi, B. Brionnet, K.M. Morimoto
    RIKEN, Saitama, Japan
  • A. Kamoshida
    National Instruments Japan Corporation, MInato-ku, Tokyo, Japan
  • K. Kaneko, R. Koyama
    SHI Accelerator Service Ltd., Tokyo, Japan
  The newly constructed superconducting linear accelerator (SRILAC) is now in operation with the aim of discovering new superheavy elements and advancing the production of medical radiation isotopes. Because it is crucial to extend the durability of the expensive Cm target for as long as possible, these experiments require the accelerated V beam to be sufficiently widened. To this end, a helium gas light emission monitor (HeLM) has been introduced to measure the beam profile. Because He gas flows within the target chamber, by capturing the light emitted from He gas with a CCD camera, the beam profile can be obtained nondestructively and continuously. These measurements are handled through programming in LabVIEW, with analyzed data integrated into an EPICS control system. A method to estimate the beam envelope has been recently developed by leveraging the measured quadrupole moments with beam energy position monitors (BEPMs), and incorporating calculations of the transfer matrix. The synergistic use of HeLM and BEPM plays a useful role in accurately controlling the beam size at the Cm target.  
poster icon Poster WEP007 [4.168 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP007  
About • Received ※ 04 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023
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WEP028 LANSCE High Density Emittance Instrumentation System emittance, instrumentation, hardware, data-acquisition 413
  • L.S. Montoya, S.A. Baily, S.M. Johnson, H.L. Leffler, H.A. Watkins, D.D. Zimmermann
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25123
The Los Alamos Neutron Science Center (LANSCE) is currently upgrading the existing emittance stations with a high-density instrumentation system for emittance measurements in the low energy beam transport region. Emittance measurements were obtained using obsolete legacy equipment. For motion control a switching station with a mechanical mux to switch actuators was used. This caused a single point of failure for all emittance stations and is becoming increasingly unreliable. For data acquisition, two sets of signal conditioning and digitizers were employed and had to be shared between 7 emittance stations. Physical cable swapping was necessary when taking measurements from station to station. A system was developed using dedicated Quad Actuator Controller (QAC) chassis, capable of driving four (4) actuators, and dedicated data acquisition (DAQ) chassis capable of signal conditioning and digitizing up to 80 channels simultaneously. Details of the system development are presented.
poster icon Poster WEP028 [0.400 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP028  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 01 October 2023
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WEP029 LANSCE QAC/DAQ Wire Scanner Instrumentation Upgrade hardware, instrumentation, data-acquisition, impedance 415
  • L.S. Montoya, S.M. Johnson, H.A. Watkins, D.D. Zimmermann
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25124
High density instrumentation has been developed to upgrade wire scanner beam diagnostic capability in all areas downstream of the Coupled Cavity LINAC (CCL). Transverse beam profile measurements were originally obtained using legacy electronics known as Computer Automated Measurement and Control (CAMAC) crates. CAMAC has become obsolete, and a new wire scanner diagnostic system was developed as a replacement. With high wire scanner device density located in each area, instrumentation was developed to meet that need along with the ability to interface with legacy open-loop controlled actuators and be forward compatible with upgraded closed-loop systems. A high-density system was developed using a Quad Actuator Controller (QAC) and Data Acquisition (DAQ) chassis that pair together using a sequencer when taking measurements. Software improvements were also made, allowing for full waveform functionality that was previously unavailable. Deployment of 52 wire scanner locations in 2022 increased device availability and functionality across the facility. Hardware and software design details along with results from accelerator beam measurements are presented.
poster icon Poster WEP029 [2.359 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP029  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 20 September 2023
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WEP031 Image Acquisition System for the Injection Dump at the Spallation Neutron Source injection, shielding, LabView, radiation 421
  • W. Blokland
    ORNL, Oak Ridge, Tennessee, USA
  • N.J. Evans, A.R. Oguz, W.D. Willis
    ORNL RAD, Oak Ridge, Tennessee, USA
  Funding: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE).
We describe the Image Acquisition system for the Injection Dump. This system visualizes the different beamlets, on the vacuum window after the H beam is stripped of its electrons by two stripper foils. One beamlet is from H with its electrons stripped by the first foil and the second beamlet has it final electron stripped by the second foil. We used the PXI platform to implement the data-acquisition including timing decoder. We describe the hardware and software for the system. We use a standard non-radhard GigE camera to acquire the image from the luminescent coating on the dump vacuum window. To lower the radiation damage to the camera, we shield it with stainless steel blocks. We present radiation measurements before and after shielding. We also show the radiation damage over time to estimate the camera’s lifetime.
poster icon Poster WEP031 [1.267 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP031  
About • Received ※ 06 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023
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WEP043 Upgrade of the ELBE Timing System timing, operation, hardware, software 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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WEP046 Progress on Distributed Image Analysis from Digital Cameras at ELSA using the RabbitMQ Message Broker interface, framework, network, distributed 449
  • M.T. Switka, K. Desch, T.J. Gereons, S. Kronenberg, D. Proft, A. Spreitzer
    ELSA, Bonn, Germany
  In the course of modernization of camera based imaging and image analysis for accelerator hardware and beam control at the ELSA facility, a distributed image processing approach was implemented, called FGrabbit. We utilize the RabbitMQ message broker to share the high data throughput from image acquisition, processing, analysis, display and storage between different work stations to achieve an optimum efficacy of the involved hardware. Re-calibration of already deployed beam profile monitors using machine vision algorithms allow us to perform qualitative beam photometry measurements to obtain beam sizes and dynamics with good precision. We describe the robustness of the calibration, image acquisition and processing and present the architecture and applications, such as the programming- and web-interface for machine operators and developers.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP046  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 15 September 2023 — Issue date ※ 28 September 2023
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TH1I01 LCLS-II Timing System and Synchronous Bunch Data Acquisition timing, MMI, linac, GUI 453
  • C. Bianchini Mattison, K.H. Kim, P. Krejcik, M. Weaver, S. Zelazny
    SLAC, Menlo Park, California, USA
  The new timing system for the LCLS-II SC linac and FEL meets the challenging requirements for delivering multiple interleaved timing patterns to a number of different destinations at rates up to 1 MHz. The timing patterns also carry information on bunch charge and beam energy to prevent inadvertent selection of beam dumps beyond their rated beam power. Beamline instruments are equipped with a timing receiver that performs bunch-by-bunch synchronous data acquisition based on the timing pattern for that location. Data is buffered in on-board memory for up to 106 machine pulses (1 second at 1 MHz). The large data volume can be locally processed and and analysed before transmission to clients on the network. Commissioning and experience with the new system will be presented.  
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slides icon Slides TH1I01 [4.514 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TH1I01  
About • Received ※ 24 October 2023 — Revised ※ 25 October 2023 — Accepted ※ 16 December 2023 — Issue date ※ 17 December 2023
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