TUP —  Tuesday Poster Session   (12-Sep-23   16:00—17:30)
Paper Title Page
TUP002 Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings 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 icon 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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TUP004 Detector Response Studies of the ESS Ionization Chamber 183
 
  • I. Dolenc Kittelmann, V. Grishinpresenter
    ESS, Lund, Sweden
  • P. Boutachkov
    GSI, Darmstadt, Germany
  • E. Effinger, A.T. Lernevall, W. Viganò, C. Zamantzas
    CERN, Meyrin, Switzerland
  
  The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a pulsed neutron source based on a proton linac. The ESS linac is designed to deliver a 2GeV beam with peak current of 62.5mA at 14 Hz to a rotating tungsten target for neutron production. One of the most critical elements for protection of an accelerator is a Beam Loss Monitoring (BLM) system. The system is designed to protect the accelerator from beam-induced damage and unnecessary activation of the components. The main ESS BLM system is based on ionization chamber (IC) detectors. The detector was originally designed for the LHC at CERN resulting in production of 4250 monitors in 2006-2008. In 2014-2017 a new production of 830 detectors with a modified design was carried out to replenish spares for LHC and make a new series for ESS and GSI. This contribution focuses on the results from a measurement campaigns performed at the HRM (High-Radiation to Materials) facility at CERN, where detector response of the ESS type IC has been studied. The results may be of interest for other facilities, that are using existing or plan to use new generation of LHC type IC monitors as BLM detectors.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP004  
About • Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 16 September 2023 — Issue date ※ 21 September 2023
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TUP005 Commissioning the Beam-Loss Monitoring System of the LCLS Superconducting Linac 187
 
  • A.S. Fisher, N. Balakrishnan, G.W. Brown, E.P. Chin, W.G. Cobau, J.E. Dusatko, B.T. Jacobson, S. Kwon, J.A. Mock, J. Park, J. Pigula, E. Rodriguez, J.I.D. Rudolph, D. Sanchez, L. Sapozhnikov, J.J. Welch
    SLAC, Menlo Park, California, USA
  
  A 4-GeV superconducting linac has been added to the LCLS x-ray FEL facility at SLAC. Its 120-kW, 1-MHz beam requires new beam-loss monitors (BLMs) for radiation protection, machine protection, and diagnostics. Long radiation-hard optical fibres span the full 4 km from the electron gun of the SC linac to the final beam dump. Diamond detectors at anticipated loss points provide local protection. Detector signals are continuously integrated with a 500-ms time constant and compared to a loss threshold. If crossed, the beam is halted within 0.1 ms. Commissioning began in March 2022 with the 100-MeV injector and with RF processing of the cryomodules. At IBIC 2022 last September, we presented commissioning results from the injector BLMs. In October, the beam passed through the full linac and the bypass transport line above the LCLS copper linac, stopping at an intermediate dump. In August it continued through the soft x-ray undulator and achieved first lasing. Here we present BLM commissioning at energies up to 4 GeV and rates up to 100 kHz. We discuss measurements and software using the fast diagnostic-waveform output to localize beam losses and to detect wire-scanner signals.  
poster icon Poster TUP005 [2.620 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP005  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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TUP006 Simulation and Shot-by-Shot Monitoring of Linac Beam Halo 191
 
  • A.S. Fisher, M. Bai, T. Frosio, A. Ratti, J. Smedley, J. Wu
    SLAC, Menlo Park, California, USA
  • I.S. Mostafanezhad, B. Rotter
    Nalu Scientific, LLC, Honolulu, USA
  
  FELs require a reproducible distribution of the bunch core at the undulator entrance for robust and reliable lasing. However, various mechanisms drive particles from the core to form a beam halo, which can scrape the beampipe of the undulator and damage its magnets. Collimators can trim the halo, but at the 1-MHz repetition rate of SLAC’s LCLS-II superconducting linac, the collimator jaws can be activated and damaged. The Machine Protection System (MPS) can detect excessive radiation and halt the beam, but repeated MPS trips lead to significant downtime. Halo control begins by studying its structure, formation, and evolution, using a sensitive halo monitor. To that end, we are developing a pixellated diamond sensor. Diamond offers a dynamic range of up to 7 orders of magnitude, extending from the edge of the core to the faint halo expected at greater distances. Nalu Scientific has developed fast electronics for high-rate shot-by-shot readout. Initial tests are starting with a prototype 16-pixel sensor at the beam dump of SLAC’s FACET-II test facility. The tests and simulations will guide more elaborate sensor designs.  
poster icon Poster TUP006 [2.602 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP006  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 19 September 2023
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TUP007 Use of the ISAC-II Flight Time Monitors toward Automated Tuning 195
 
  • S. Kiy, P.M. Jung, T. Planche, O. Shelbaya, V.V. Verzilov
    TRIUMF, Vancouver, Canada
  
  A time-of-flight measurement system has been in use at ISAC-II since 2006 for the phasing of cavities and accurate ion beam velocity measurements across the nuclear chart. This system is heavily relied upon as the primary energy-time domain diagnostic downstream of the ISAC-II linac. Ongoing High Level Applications (HLA) development at TRIUMF has enabled the use of methods that are being applied to these measurements - both for processing and automation of data acquisition. An update will be provided on operational experience with the system over the past 10 years including its recent re-calibration and error analysis. A brief summary of the current HLA framework will be given, including a database for beam measurements and the ability to carry out sequential measurement processes. Finally, the way in which these developments enable beam-based calibration of cavity parameters and a shift to model-based tuning methods is discussed.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP007  
About • Received ※ 29 August 2023 — Revised ※ 12 September 2023 — Accepted ※ 15 September 2023 — Issue date ※ 30 September 2023
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TUP008
 Recording Series of Coherent Thz Pulse Shapes with Up to 88 MHz Repetition Rate at Soleil, Using Photonic Time-Stretch  
 
  • C. Szwaj, S. Bielawskipresenter
    PhLAM/CERLA, Villeneuve d’Ascq, France
  • J.B. Brubach, M. Labat, L. Manceron, P. Roy
    SOLEIL, Gif-sur-Yvette, France
  • C. Evain, M. Le Parquier, E. Roussel
    PhLAM/CERCLA, Villeneuve d’Ascq Cedex, France
  
  Funding: ANR/DFG ULTRASYNC, CEMPI LABEX, CPER Photonic for Society
Recording THz signals in single-shot is required in various accelerator applications, including real-time studies of electron bunch shapes, and user-applications employing coherent THz synchrotron radiation. For this purpose, many accelerator facilities have implemented laser-based measurement systems known as electro-optic detection. This consists of ¿imprinting¿ the unknown terahertz waveform on a shot laser pulse, that is subsequently analyzed. Few years ago a new variant of this method, time-stretch electro-optic detection [1,2], has been introduced with the aim to cope with high repetition-rate machines. We present the current record in repetition rate (up to 88 MHz), that has been obtained at the AILES beamline of the SOLEIL facility. We also present the projects aiming at reaching long recording windows and/or high bandwidth [3] using time-stretch, as well as the expected fundamental trade-offs linked to the quest for high repetition rate.
[1] E. Roussel et al., Scientific reports 5.1 (2015): 1-8.
[2] S. Bielawski et al., Scientific reports 9.1 (2019): 10391.
[3] E. Roussel et al., Light: Science & Applications 11.1 (2022): 14.
 		 
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TUP009 Bunch Length Measurement System Downstream the Injector of the S-DALINAC 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 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 icon 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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TUP011 Geometry Study of an RF-Window for a GHz Transition Radiation Monitor for Longitudinal Bunch Shape Measurements 209
 
  • S. Klaproth, A. Penirschke
    THM, Friedberg, Germany
  • H. De Gersem
    TEMF, TU Darmstadt, Darmstadt, Germany
  • R. Singh
    GSI, Darmstadt, Germany
  
  Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05P21RORB2. Joint Project 05P2021 - R&D Accelerator (DIAGNOSE)
GHz transition radiation monitors (GTRs) can be used to measure longitudinal beam profiles even for low ß beams. In comparison to traditional methods e.g., Fast Faraday Cups (FFCs) and Feschenko monitors, GTRs are a non-destructive measurement method and are able to resolve bunch-by-bunch longitudinal profiles at the same time. In our case, we plan to measure the transition radiation outside the beam line through an RF-window with an 8 GHz broad band antenna. At the border of the RF-window the transition radiation is partially reflected propagating in the beam line backwards. In this contribution, we show a study of different geometries to suppress reflections generated at the transition to the RF-window. For higher permittivity the strength of these reflections becomes stronger, simultaneously reducing the measurable signal strength at the antenna. Secondly the RF-window material must be UHV usable and should be durable like Alumina or Peek. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP011  
About • Received ※ 25 September 2023 — Revised ※ 29 September 2023 — Accepted ※ 30 September 2023 — Issue date ※ 30 September 2023
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TUP012 First Measurements of an Electro-Optical Bunch Arrival-Time Monitor Prototype with PCB-Based Pickups for ELBE 214
 
  • B.E.J. Scheible, A. Penirschke
    THM, Friedberg, Germany
  • W. Ackermann, H. De Gersem
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M.K. Czwalinna, T.A. Nazer, H. Schlarb, S. Vilcins
    DESY, Hamburg, Germany
  • M. Freitag, M. Kuntzsch
    HZDR, Dresden, Germany
  
  Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under Contract No. 05K19RO1 and 05K22RO2.
A vacuum sealed prototype of an electro-optical bunch-arrival-time monitor has been commissioned in 2023. It comprises of a pickup-structure and a low-pi-voltage ultra-wideband traveling wave electro-optical modulator. The stainless-steel body of the pickup structure is partially produced by additive manufacturing and comprises four pickups as well as an integrated combination network on a printed circuit board. This novel design aims to enable single-shot bunch-arrival-time measurements for electron beams in free-electron lasers with single-digit fs precision for low bunch charges down to 1 pC. The theoretical jitter charge product has been estimated by simulation and modeling to be in the order of 9 fs pC. The new prototype is tailored for validation experiments at the ELBE accelerator beamline. In this contribution first measurement results are presented. 		 
poster icon Poster TUP012 [2.469 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP012  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023
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TUP013
 Diversity Enhanced Electro-Optic Sampling at EuXFEL  
 
  • B. Steffen, M.K. Czwalinna
    DESY, Hamburg, Germany
  • S. Bielawski, Q. Demazeux, C. Evain, E. Roussel, C. Szwaj
    PhLAM/CERLA, Villeneuve d’Ascq, France
  
  Electro-optical detection has proven to be a valuable technique to study temporal profiles of THz pulses with pulse durations down to femtoseconds. Recently, a numerical reconstruction strategy called DEOS [1] (Diversity Electro-Optical Sampling) proved to be much more efficient in retrieving ultrafast input signals. First tests at the European X-ray FEL (EuXFEL) in Hamburg show a 200 fs temporal resolution over more than 10 ps recording length. This technique, however, requires to measure both orthogonal polarizations of the sampling laser pulse simultaneously. Further adaptations to the existing design of the compact EOD bunch length monitor [2] are needed to fully implement the new measurement strategy, which will be presented in this paper.
[1] E. Roussel, C. Szwaj, C. Evain, B. Steffen, C. Gerth, B. Jalali and S. Bielawski, Light Sci. Appl., vol. 11, p. 14, 2022. doi:10.1038/s41377-021-00696-2 [2] B. Steffen, Ch. Gerth, M. Caselle, M. Felber, T. Kozak, D. R. Makowski, U. Mavric, A. Mielczarek, P. Peier, K. Przygoda, and L. Rota, Sci. Instrum., vol 91, p. 045123, 2020. doi:10.1063/1.5142833 		 
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TUP014 Design and Test of a Prototype 324 MHz RF Deflector in the Bunch Shape Monitor for CSNS-II Linac Upgrade 219
 
  • W.L. Huang, X.J. Nie
    IHEP CSNS, Guangdong Province, People’s Republic of China
  • M.Y. Liu, X.Y. Liu, Y.F. Sui
    IHEP, Beijing, People’s Republic of China
  • Q.R. Liu
    UCAS, Beijing, People’s Republic of China
  
  Funding: Natural Science Foundation of Guangdong Province, 2021A1515010269 National Natural Science Foundation, 11475204
During the upgrade of linac in CSNS-II, the beam in-jection energy will increase from 80.1MeV to 300MeV and the beam power from 100kW to 500kW. A com-bined layout of superconducting spoke cavities and ellip-tical cavities is adopted to accelerate H− beam to 300MeV. Due to a ~10ps short bunch width at the exit of the spoke SC section, the longitudinal beam density dis-tribution will be measured by bunch shape monitors using low energy secondary emission electrons. As the most important part of a bunch shape monitor, a prototype 324MHz RF deflector is designed and tuned on the basis of a quasi-symmetric λ/2 325MHz coaxial resona-tor, which was fabricated for the C-ADS proton accelera-tor project. Preliminary parameters of the bunch shape monitor are presented. Simulation of the RF deflector and test results in the laboratory are described and analysed. 		 
poster icon Poster TUP014 [0.648 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP014  
About • Received ※ 30 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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TUP016
 The Upgrade of the Light Pulse Picking System at HLS-II  
 
  • J. Wang, P. Lu, B.G. Sun, L.L. Tang, Y.K. Zhao, T.Y. Zhou, Z.R. Zhou
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  
  Funding: National Natural Science Foundation of China under Grant 12075236
In 2009, the light pulse picking system was built to pick a single synchrotron radiation light pulse from 45 light pulses so that it can be used for researching the longitudinal bunch characteristics at HLS. The optical system was operating well, but the optical pulse picking width was 9.8 ns, which is greater than the bunch interval of 4.9 ns. Therefore, the signal-to-noise ratio of the system is not good enough. The HLS-II light source refers to the machine upgrade project of HLS in 2014. After that, the longitudinal beam characteristics was changed. Therefore, the synchrotron light pulse picking system with better performance has been developed to meet the needs of beam diagnosis and longitudinal beam dynamics research. 		 
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TUP018
 Longitudinal Parameter Measurement System Based on Time-Frequency Domain Joint Analysis  
 
  • HS. Wang, Y.M. Zhou
    SSRF, Shanghai, People’s Republic of China
  • Y.B. Leng
    USTC/NSRL, Hefei, Anhui, People’s Republic of China
  • X. Yang
    UCAS, Beijing, People’s Republic of China
  
  This paper proposes a novel technique for measuring longitudinal bunch length by performing spectral analysis on the beam signals to extract the bunch length information for each bunch and each turn. A high-speed oscilloscope is used to capture original button signal with more than 7000 turns information and an offline Python script is used to retrieve bunch length and phase information. A streak camera is used to calibrate the transfer function of the acquisition system. Experiments were carried out at the Shanghai Synchrotron Radiation Facility and the Hefei Light Source by capturing the electrode signals with an oscilloscope during single bunch injection and harmonic cavity tuning in the storage ring. The calibrated longitudinal bunch length measurement system yielded favorable results, with a larger dynamic range and higher time resolution compared to the streak camera. In the future, the system has the potential to be transplanted into a processor to achieve online longitudinal beam measurement for each bunch.  
poster icon Poster TUP018 [0.568 MB]  
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TUP019
 Femtosecond Relativistic Electron Bunch Compression and Diagnosis using Terahertz-driven Resonators  
 
  • Y. Xu, K. Fan, Z. Liu, Y. Song, C.-Y. Tsai
    HUST, Wuhan, People’s Republic of China
  • L.X.F. Li
    Private Address, Wuhan, People’s Republic of China
  
  Funding: This work is supported by the National Natural Science Foundation of China (12235005) and the Science and Technology Project of State Grid (5400-202199556A-0-5-ZN).
Ultrafast electron beams lengthening and time jitter severely degrade the temporal resolution in electron-laser applications, such as ultrafast electron diffraction (UED). In recent years, terahertz-driven devices have shown great potential in beam manipulation and diagnostics. This paper reports an all-optical method for compressing and characterizing a 3 MeV electron beam using single-cycle terahertz radiation. A THz buncher longitudinally compresses the electron beams, and the resulting shortest bunch length and arrival time are measured using a transverse THz field in a downstream terahertz slit. Particle tracking simulation shows that the bunch is compressed more than 13 times from 54 fs to 4 fs, and the arrival time jitter is reduced from 100 fs to 21 fs. This method effectively manipulates the beam longitudinal phase space, compresses the beam length, and suppresses the time jitter. It is expected to significantly impact ultrafast science and be applied in other accelerator applications. 		 
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TUP020
 Development of Stripline Fast Faraday Cup at MEBT of RAON  
 
  • J.W. Kwon, G.D. Kim, H.J. Woo
    IBS, Daejeon, Republic of Korea
  • E.H. Lim
    Korea University Sejong Campus, Sejong, Republic of Korea
  
  RAON (Rare isotope accelerator complex for On-line experiment) is an accelerator that accelerates heavy ions such as uranium, oxygen, and protons. In the MEBT section, the ion beam is accelerated and focused by RFQ, has bunch structure with a period of 81.25 MHz, and has an energy of 507 keV/u. To measure the shape of a beam, the transverse and longitudinal profiles should be obtained using beam diagnostic device. To measure bunch lengths of less than 1 ns, 50 Ω matched stripline type fast faraday cup was fabricated and the signal was amplified by a 4 GHz broadband signal amplifier with a gain of 42 dB. The amplified signal was measured using an oscilloscope with a high sampling frequency of 25 GSPS and a wide frequency bandwidth of 4 GHz. The developed fast faraday cup was installed at the end of the MEBT in front of SCL3. This poster describes the design of a stripline fast faraday cup and the results of measuring the bunch length at a MEBT section using Ar 9+ at 30 uA current.  
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TUP021 Development of the RF Phase Shifter with Femtosecond Time Delay Resolution for the PAL-XFEL Laser System 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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TUP022 Characterisation of Cherenkov Diffraction Radiation Using Electro-Optical Methods 226
 
  • A. Schlögelhofer, T. Lefèvre, S. Mazzoni, E. Senes
    CERN, Meyrin, Switzerland
  • L. Duvillaret
    KAPTEOS, Sainte-Helene-du-Lac, France
  • A. Schlögelhofer
    TU Vienna, Wien, Austria
  
  The properties of Cherenkov diffraction radiation (ChDR) have been studied extensively during the recent years to be exploited for non-invasive beam diagnostic devices for short bunches. The dependence of charge and the influence of the bunch form factor on the coherent part of the radiated spectrum have been demonstrated and studied in the past. However, the actual field strength of coherent ChDR as well as its study in time domain need further investigation. In this contribution we are using electro-optical techniques to investigate and quantify these parameters. The electro-optical read-out brings the advantage of high bandwidth acquisition and insensitivity to electromagnetic interference, whereas at the same time a large fraction of the acquisition setup can be installed and operated outside of the radiation controlled areas. We will present experimental results from the CLEAR facility at CERN as well as simulations of the peak field of the temporal profile of beam-generated ChDR pulses.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP022  
About • Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 13 September 2023
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TUP023 Application of a Camera Array for the Upgrade of the AWAKE Spectrometer 230
 
  • E. Senes, S. Mazzoni, M. Turner, G. Zevi Della Porta
    CERN, Meyrin, Switzerland
  • D.A. Cooke, F.E. Pannell, M. Wing
    UCL, London, United Kingdom
  
  The first run of the AWAKE experiment successfully demonstrated the acceleration of an electron beam in the plasma wakefields of a relativistic proton beam. The planned second run will focus on the control of the emittance  of accelerated electrons, requiring an upgrade of the  existing spectrometer. Preliminary measurements showed that this might be achieved by improving the resolution of the scintillator and with a new design of the optical system. This contribution discusses the application of a digital camera array in close proximity of the spectrometer scintillator, to enable the accelerated electron beam emittance measurement.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP023  
About • Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 24 September 2023
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TUP026 Bunch Compressor Monitors for the Characterization of the Electron Bunch Length in a Linac-Driven FEL 235
 
  • G.L. Orlandi
    PSI, Villigen PSI, Switzerland
  
  The lasing performance of a Free Electron Laser (FEL) strongly relies on a precise characterization of the electron bunch length and on the control and stabilization of the bunch compression settings of the machine under normal user operations. In a FEL driver linac, the so-called Bunch Compressor Monitors (BCMs) normally ensure the non-invasive monitoring of the electron bunch length. BCMs, being sensitive to the temporal coherent threshold of the radiation energy emitted by the electron beam crossing the last dipole of a magnetic chicane or a holed diffraction screen just downstream, can provide a bunch length dependent signal resulting from the integration of the detected radiation pulse energy over the acceptance frequency band of the detector. Thanks to the non-invasiveness, BCMs are primary diagnostics in a FEL to stabilize the bunch compression by feeding back the RF settings of the accelerating structure. In this contribution, we present a formal method to determine an absolute measurement of the electron bunch length from the analysis of a BCM signal (*).
(*) G.L. Orlandi, Absolute and non-invasive determination of the
electron bunch length in a Free Electron Laser using
a Bunch Compressor Monitor, https://doi.org/10.48550/arXiv.2305.17042, https://doi.org/10.21203/rs.3.rs-3228455/v1 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP026  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 15 September 2023
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TUP027 Microbunching of Thermionic Cathode RF Gun Beams in the Advanced Photon Source S-Band Linac 240
 
  • J.C. Dooling, A.R. Brill, N. Kuklev, I. Lobach, A.H. Lumpkin, N. Sereno, Y. Sun
    ANL, Lemont, Illinois, USA
  
  Funding: Work supported by the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
We report on measurements of beams from thermionic cathode (TC) rf guns in the Advanced Photon Source S-Band Linac. These measurements include the macropulse out of both new and existing TC guns as well as the observation of microbunching within the micropulses of these beams. A gun chopper limits the macropulse FWHM duration to the 10-ns range. Our objectives were to analyse the new TC gun and investigate microbunching within a TC-rf-gun-generated beam. Our diagnostics elucidated longitudinal beam structures from the ns to the fs time scales. Coherent transition radiation (CTR) interferometers responding to far-infrared wavelengths were employed after each compression stage to provide the autocorrelations of the sub-ps micropulse durations. The first compression stage is an alpha magnet and the second a chicane. A CCD camera was used to image the beam via optical transition radiation from an Al screen at the end of the linac and also employed to measure coherent optical transition radiation (COTR) in the visible range. The COTR diagnostic observations, implying microbunching on a fs time scale, are presented and compared with a longitudinal space-charge impedance model. 		 
poster icon Poster TUP027 [3.649 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP027  
About • Received ※ 15 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 23 September 2023
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TUP028 Collimator Irradiation Studies at the Advanced Photon Source 245
 
  • J.C. Dooling, W. Berg, M. Borland, J.R. Calvey, L. Emery, A.M. Grannan, K.C. Harkay, Y. Lee, R.R. Lindberg, G. Navrotski, V. Sajaev, N. Sereno, J.B. Stevens, Y.P. Sun, K.P. Wootton
    ANL, Lemont, Illinois, USA
  • N.M. Cook
    RadiaSoft LLC, Boulder, Colorado, USA
  • D.W. Lee, S.M. Riedel
    UCSC, Santa Cruz, California, USA
  
  Funding: Work supported by the U.S. D.O.E.,Office of Science, Office of Basic Energy Sciences, under contract number DE-AC02- 06CH11357.
We present results from a recent collimator irradiation experiment conducted in the Advanced Photon Source (APS) storage ring. This experiment is the third in a series of studies to examine the effects of high-intensity electron beams on potential collimator material for the APS-Upgrade (APS-U). The intent here is to determine if a fan-out kicker can sufficiently reduce e-beam power density to protect horizontal collimators planned for the APS-U storage-ring. The fan-out kicker (FOK) spreads the bunched-beam vertically allowing it to grow in transverse dimensions prior to striking the collimator. In the present experiment, one of the two collimator test pieces is fabricated from oxygen-free copper; the other from 6061-T6 aluminum. As in past studies, diagnostics include turn-by-turn BPMs, a diagnostic image system, fast beam loss monitors, a pin-hole camera, and a current monitor. Post-irradiation analyses employ microscopy and metallurgy. To avoid confusion from multiple strikes, only three beam aborts are carried out on each of the collimator pieces; two with the FOK on and the other with it off. Observed hydrodynamic behavior will be compared with coupled codes. 		 
poster icon Poster TUP028 [3.733 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP028  
About • Received ※ 07 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 29 September 2023
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TUP029 A Hybrid Approach to Upgrade Hardware for the Proton Storage Ring Fast Kicker 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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TUP030
 Proposal for a Low-Cost Wakefield Deflector for CW X-ray FEL Operation  
 
  • D.K. Bohler, P. Krejcik, A.A. Lutman, A. Novokhatski
    SLAC, Menlo Park, California, USA
  
  SLAC National Accelerator Laboratory is undertaking a project to develop a dielectric wakefield deflector with the goal of enhancing Free-Electron Laser (FEL) operational modes and providing comprehensive bunch diagnostics. The project aims to re-establish and optimize the Fresh-slice operation modes in the recently upgraded Soft X-ray Line (SXR) of the LCLS, a scheme noted for its success in delivering femtosecond, high-power double-pulses within the SXR wavelength range and contributing significantly to research published in high-impact journals. The novel wakefield deflector design incorporates an L-shaped bar and a dielectric wakefield deflector using an anodized aluminum bar, drawing from the successful approaches of teams at DESY and PSI. This single straight, rectangular aluminum L-shaped bar, coated with an aluminum oxide dielectric layer, represents a marked improvement over previous corrugated metal jaw designs. Furthermore, this project explores the potential of this passive streaker as a diagnostic tool for electron bunch phase space, promising exciting advancements in the field of accelerator technologies  
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TUP031 Beam Test of a Harmonic Kicker Cavity 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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TUP034 Axial Cryogenic Current Comparator (CCC) for FAIR 259
 
  • L. Crescimbeni, D.M. Haider, A. Reiter, M. Schwickert, T. Sieber, T. Stöhlker
    GSI, Darmstadt, Germany
  • D.M. Haider
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Schmelz, R. Stolz, V. Zakosarenko
    IPHT, Jena, Germany
  • F. Schmid, V. Tympel
    FSU Jena, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • T. Stöhlker, V. Tympel
    HIJ, Jena, Germany
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  
  Funding: Work supported by the BMBF under contract No. 05P21SJRB1.
The Cryogenic Current Comparator (CCC) is a superconducting device based on an ultrasensitive SQUID (fT range). Measuring the beam¿s azimuthal magnetic field, it provides a calibrated non-destructive measurement of beam current with a resolution of 10 nA or better, independent from ion species and without tedious calibrations procedure. The non-interceptive absolute intensity measurement of weak ion beams (< 1 µA) is essential in heavy ion storage rings and in transfer lines at FAIR. With standard diagnostics, this measurement is challenging for bunched beams and virtually impossible for coasting beams. To improve the performance of the detector several upgrades are under study and development: One is the investigation of a new type of CCC using an alternative magnetic shield geometry. The so-called ‘axial¿ geometry will allow for much higher magnetic shielding factor, an increased pick-up area, and a lower low frequencies noise component. Further improvements and optimizations of the detector will be presented. The CCC will be tested on the beamline at the end of 2023 allowing to define the best possible version for FAIR. 		 
poster icon Poster TUP034 [3.877 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP034  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
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TUP035 Multi-Tile Zinc-Oxide-Based Radiation-Hard Fast Scintillation Counter for Relativistic Heavy-Ion Beam Diagnostics: Prototype Design and Test 263
 
  • M. Saifulin, P. Boutachkov, C. Trautmann, B. Walasek-Höhne
    GSI, Darmstadt, Germany
  • E.I. Gorokhova
    GOI, St Petersburg, Russia
  • P. Rodnyi, I.D. Venevtsev
    SPbPU, St. Petersburg, Russia
  • C. Trautmann
    TU Darmstadt, Darmstadt, Germany
  
  Funding: DLR funded this work within the ERA. Net RUS Plus Project RUSST2017-051.
This contribution summarizes the design and performance test of a prototype radiation-hard fast scintillation detector based on the indium-doped zinc oxide ceramic scintillator, ZnO(In). The prototype detector has been developed for use as a beam diagnostics tool for high-energy beam lines of the SIS18 synchrotron at the GSI Helmholtz Center for Heavy Ion Research GmbH. The new detector consists of multiple ZnO(In) scintillating ceramics tiles stacked on the front and back sides of a borosilicate light guide. The performance of the detector was tested in comparison to a standard plastic scintillation detector with 300 MeV/u energy 40Ar, 197Au, 208Pb, and 238U ion beams. The investigated prototype exhibits 100% counting efficiency and radiation hardness of a few orders of magnitude higher than the standard plastic scintillation counter. Therefore, it provides an improved beam diagnostics tool for relativistic heavy-ion beam measurements.
* doi:10.18429/JACoW-IBIC2019-MOPP005
** doi:10.18429/JACoW-IBIC2022-TUP29
*** doi:10.18429/JACoW-IBIC2022-WE3I1 		 
poster icon Poster TUP035 [16.714 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP035  
About • Received ※ 13 July 2023 — Accepted ※ 12 September 2023 — Issue date ※ 15 September 2023  
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TUP036 Cryogenic Current Comparators as Low Intensity Diagnostics for Ion Beams 268
 
  • T. Sieber, L. Crescimbeni, D.M. Haider, M. Schwickert, T. Stöhlker
    GSI, Darmstadt, Germany
  • D.M. Haider, N. Marsic
    TEMF, TU Darmstadt, Darmstadt, Germany
  • M. Schmelz, R. Stolz, V. Zakosarenko
    IPHT, Jena, Germany
  • F. Schmid
    FSU Jena, Jena, Germany
  • T. Stöhlker
    IOQ, Jena, Germany
  • T. Stöhlker, V. Tympel
    HIJ, Jena, Germany
  • J. Tan
    CERN, Meyrin, Switzerland
  • V. Zakosarenko
    Supracon AG, Jena, Germany
  
  The Cryogenic Current Comparator (CCC) is a SQUID based superconducting device for intensity measurement, firstly proposed as a beam diagnostics instrument in the 90s at GSI. After prove of principle the CCC was introduced into other facilities, attesting great potential for high resolution measurements but at the same time considerable mechanical and cryogenics challenges and costs. In the course of plannings for FAIR the CCC has been revitalized. Systematic investigations started, involving commercially available SQUID systems, which led to improvements of detector and cryostat. The developments resulted in nA spill measurements at GSI (2014) followed by the installation of a CCC in CERN Antiproton Decelerator (AD), which has in the meantime become a key instrument. Since then optimization of the device is ongoing, with respect to various operating conditions, system robustness, current resolution and last but not least system costs. Alternative CCC versions with improved magnetic shielding have been developed as well as ¿Dual Core‘ versions for background noise reduction. We give an overview of CCC optimization and development steps, with focus on applications at GSI and FAIR.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP036  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 21 September 2023
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TUP037 Charge Measurement with Resonators at ARES 273
 
  • D. Lipka, T. Lensch, Re. Neumann, M. Werner
    DESY, Hamburg, Germany
  
  The ARES facility (Accelerator Research Experiment at SINBAD) is an accelerator to produce low charge ultra-short electron bunches within a range of currently 0.5 pC to 200 pC. Especially for eFLASH experiments at ARES an absolute, non-destructive charge measurement is required. To measure an absolute charge of individual bunches different types of monitors are installed. A destructive Faraday Cup is used as reference charge measurement device. To measure the charge non-destructively 2 Toroids, 1 Turbo-ICT and 2 cavity monitors are installed. The latter system consists of the cavity, front-end electronics with logarithmic detectors and µTCA ADCs. The laboratory calibration of the cavity system is performed by using an arbitrary waveform generator which generate the same waveform like the cavity with beam. This results in a non-linear look-up table used to calculate the ADC amplitude in charge values independent of beam-based calibration. The measured charges from the cavity monitors agree very well within few percent in comparison with the Faraday Cup results.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP037  
About • Received ※ 01 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023
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TUP038 BCM System Optimization for ESS Beam Commissioning through the DTL Tank4 277
 
  • H. Hassanzadegan, R.A. Baron, S. Gabourin, H. Kocevar, M. Mohammednezhad, J.F.J. Murari, S. Pavinato, K.E. Rosengren, T.J. Shea, R. Zeng
    ESS, Lund, Sweden
  • K. Czuba, P.K. Jatczak
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  
  The ESS BCM system is not only used for beam measurement but it also plays an important role for machine protection particularly in the normal-conducting part of the linac. During the previous beam commissionings to the MEBT and DTL1 FCs and before the cavities were fully conditioned, RF breakdowns and other types of discharges in the cavities had a major impact on beam availability due to the Fast machine protection functions of the BCM. Following an investigation on the root cause of the beam trips, the configuration of the machine protection functions was modified to improve beam availability in the more recent beam commissioning to the DTL4 FC. In addition to this, some optimizations were made in the BCM system to improve beam measurement, and a few more functions were added based on new requirements. This paper reports on these improvements and the results obtained during the beam commissioning through the DTL4.  
poster icon Poster TUP038 [2.040 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP038  
About • Received ※ 31 July 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 14 September 2023
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TUP040
 CHG0 to HERO - An Update to the Fermilab Booster DCCT  
 
  • E.B. Milton
    Fermilab, Batavia, Illinois, USA
  
  The Booster complex at Fermi National Accelerator Laboratory uses a DC Current Transformer (DCCT) in conjunction with analog circuitry to measure intensity of the circulating beam during the acceleration cycle. This measurement is affectionately known as Charge Zero (CHG0). This platform has been updated to a Bergoz New Parametric Current Transformer (NPCT) and FPGA Data Acquisition System that digitally normalizes beam current to provide a High-quality E12 Read Out (HERO) for the PIP-II era.  
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TUP041 APS Upgrade Radiation Safety Beam Current Interlock 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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TUP042 Nano-Amp Beam Current Diagnostic for Linac-to-ESA (LESA) Beamline 285
 
  • S.T. Littleton
    Stanford University, Stanford, California, USA
  • A.S. Fisherpresenter, C. Huang, T.O. Raubenheimer
    SLAC, Menlo Park, California, USA
  
  The LESA beamline is designed to transport dark current from the LCLS-II and LCLS-II-HE superconducting linacs to the End Station A for various fixed target experiments. The primary experiment is expected to be the Light Dark Matter eXperiment (LDMX) which required beam currents of a few pA. The operation of the beam line much be parasitic to the LCLS-II / LCLS-II-HE FEL operation. The dark current in the LCLS-II is expected to be at the nA-level which will be below the resolution of most of the LCLS-II diagnostics (it will be degraded before the experiments as necessary). This paper will describe a possible non-destructive diagnostic using synchrotron radiation that could be applied at multiple locations along the LCLS-II and the LESA beamline.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP042  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
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TUP043
 Beam Diagnosis Control System Upgrade Based on EPICS at RAON  
 
  • E.H. Lim, E.-S. Kim
    Korea University Sejong Campus, Sejong, Republic of Korea
  • G.D. Kim, J.W. Kwon, H.J. Woo
    IBS, Daejeon, Republic of Korea
  
  The Rare-isotope Accelerator complex for ON-line experiment (RAON) is a heavy ion accelerator with a maximum beam power of 400 kW. RAON is equipped with various diagnostic devices, including the Faraday Cup, Wire Scanner, and Beam Viewer, for measuring beam characteristics. EPICS is used for integrated control of driving devices such as motors and air cylinders and data collection devices, and performs sequential operations according to an algorithm written in SEQUENCER. As beam commissioning operation progressed, various improvement requirements were identified. Algorithms have been upgraded to provide error signals and prevent collisions between devices, ensuring stability. In this paper, we present the RAON’s upgraded diagnostic control system.  
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TUP044 The Digital Signal Processing Chain of the CERN LIU BWS 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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TUP045 Real Time Momentum Spread Measurement of the CERN Antiproton Decelerator Beam 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 icon 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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TUP046 Status of the RFSoC-based Signal Processing for Multi-bunch and Filling Pattern Feedbacks in the SLS 2.0 297
 
  • 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
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)