IBIC2023 - Table of Session: MOP (Monday Poster Session)

Paper	Title	Page
MOP001	Current Status of the HESR Beam Instrumentation	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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MOP002	MiniBEE - Minibeam Beamline for Preclinical Experiments	34
	J. Reindl, G. Datzmann, G. Dollinger, J. Neubauer, A. Rousseti Universität der Bundeswehr Muenchen, Neubiberg, Germany J. Bundesmann, A. Denker, A. Dittwald, G. Kourkafas HZB, Berlin, Germany G. Datzmann Datzmann Interact & Innovate GmbH, München, Germany A. Denker BHT, Berlin, Germany
	Spatial fractionated radiotherapy using protons, so-called proton minibeam radiotherapy (pMBT) was developed for better sparing of normal tissue in the entrance channel of radiation. Progressing towards clinical use, pMBT should overcome current technical and biomedical limitations. This work discusses a preclinical pMBT facility, currently built at the 68.5MeV cyclotron at the Helmholtz Zentrum Berlin. The goal is to irradiate small animals using focused pMBT with a σ of 50µm, a high peak-to-valley dose ratio at center-to-center distance as small as 1mm and beam current of 1nA. A first degrader defines the maximum energy of the beam. Dipole magnets and quadrupole triplets transport the beam to the treatment room while multiple slits properly form the transverse beam profiles. A high magnetic field gradient triplet lens forms the minibeams in front of the target station and, scanning magnets are used for a raster scan at the target. An additional degrader, positioned close before the focusing spot and the target, further reduces the energy, forming a spread-out Bragg peak. A small animal radiation research platform will be used for imaging and positioning of the target.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP002
About •	Received ※ 09 September 2023 — Revised ※ 14 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 29 September 2023
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MOP003	Design of HEPS Storage Ring Beam Instrumentation
	J.H. Yue, J.S. Cao, Y.Y. Du, J. He, F. Liu, X.Y. Liu, Z. Liu, Y.H. Lu, H.Z. Ma, Y.F. Sui, L. Wang, S.J. Wei, T.G. Xu, Q. Ye, L. Yu, W. Zhang, Y. Zhao, D.C. Zhu IHEP, Beijing, People’s Republic of China A.X. Wang USTC/NSRL, Hefei, Anhui, People’s Republic of China
	HEPS is a fourth generation light source which has horizontal emittance around 34pm.rad to gain the high brilliance photon beam, this ultra-low emittance brings many engineering challenges for beam instrumentation. The resolution of the beam position measurement and the beam size measurement is need to reach sub-micro meter. The large current and multi-bunches need bunch by bunch feedback system to cure instabilities. This paper will present an overview of beam instrumentation
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MOP004	Design and Study of Cavity Quadrupole Moment and Energy Spread Monitor	37
	Q. Wang, Q.Y. Dong, L.T. Huang DICP, Dalian, Liaoning, People’s Republic of China Q. Luo USTC/NSRL, Hefei, Anhui, People’s Republic of China
	A nondestructive method to measure beam energy spread using the quadrupole modes within a microwave cavity is proposed. Compared with a button beam position monitor (BBPM) or a stripline beam position monitor (SBPM), the cavity monitor is a narrow band pickup and therefore has better signal-to-noise ratio (SNR) and resolution. In this study, a rectangular cavity monitor is designed. TM220 mode operating at 4.76 GHz in the cavity reflects the quadrupole moment of the beam. The cavity plans to be installed behind a bending magnet in Dalian Coherent Light Source (DCLS), an extreme ultraviolet FEL facility. In this position, the beam has a larger dispersion, which is beneficial to measure the energy spread. A quadrupole magnet, a fluorescent screen, and a SBPM with eight electrodes is installed near the cavity for calibration and comparison. The systematic framework and simulation results are also discussed in this paper.
	Poster MOP004 [0.882 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP004
About •	Received ※ 13 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 28 September 2023
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MOP006	Design Overview of the Electron Storage Ring Instrumentation System for Hefei Advanced Light Factory
	B.G. Sun, Y.B. Leng, Y. Liang, P. Lu, Q. Luo, L.L. Tang, A.X. Wang, J. Wang, T.Y. Zhou, Z.R. Zhou USTC/NSRL, Hefei, Anhui, People’s Republic of China
	The Hefei Advanced Light Factory (HALF) is a diffraction-limited storage ring with a beam energy of 2.2 GeV. Based on the beam related technical parameters and requirements provided by the physical design of the HALF storage ring, the storage ring beam instrumentation system mainly includes beam position measurement system, DC current measurement system, bunch-by-bunch beam current measurement system, tune measurement system, beam profile measurement system, bunch length measurement system, bunch-by-bunch feedback system, fast orbit feedback system, BPM displacement measurement system, and beam loss measurement. An overview of the design of the storage ring instrumentation system will be presented.
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MOP007	Experimental Verification of the Coherent Diffraction Radiation Measurement Method for Longitudinal Electron Beam Characteristics	41
	R. Panaś, A.I. Wawrzyniak NSRC SOLARIS, Kraków, Poland A. Curcio LNF-INFN, Frascati, Italy K. Łasocha CERN, Meyrin, Switzerland
	This paper presents a natural extension of prior theoretical investigations regarding the utilization of coherent diffraction radiation for assessing longitudinal characteristics of electron beams at Solaris. The study focuses on the measurement results obtained at the linac injector of the Solaris synchrotron and their analysis through a theoretical model. The findings are compared with previous estimates of the electron beam longitudinal profile. This paper contributes to the future diagnostics at the first Polish free electron laser (PolFEL) project, where it will be used for the optimization of particle accelerator performance.
	Poster MOP007 [20.060 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP007
About •	Received ※ 02 August 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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MOP008	Consideration of Beam Instrumentation for SOLARIS Linac Upgrade	45
	A.I. Wawrzyniak, J.B. Biernat, R. Panaś, J.J. Wiechecki, M.T. Ünal NSRC SOLARIS, Kraków, Poland A. Curcio LNF-INFN, Frascati, Italy
	SOLARIS linac currently operates at 540 MeV and is used as an injector to the storage ring, where after the accumulation the energy is ramped up to 1.5 GeV via two active RF cavities. Top-up injection would be of extreme benefits for user operation, therefore a new 1.5 GeV linac is being designed. The idea is to replace the current machine without infrastructural interventions in terms of tunnel expansion. Performed studies demonstrate that the best solution is provided by a Hybrid S-band/C-band LINAC. One of the main goals is to achieve bunch compression below the picosecond level and low-emittance beams for a future short-pulse facility or a Free Electron Laser. Within this presentation the results of performed simulations will be presented together with the concept of different diagnostics as BPMs, current transformers, YAG screens, coherent diffraction radiation monitor distribution.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP008
About •	Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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MOP009	A Snapshot of CERN Beam Instrumentation R&D Activities	49
	T. Lefèvre, D. Alves, A. Boccardi, S. Jackson, F. Roncarolo, J.W. Storey, R. Veness, C. Zamantzas CERN, Meyrin, Switzerland
	The CERN accelerator complex stands out as an unique scientific tool, distinguished by its scale and remarkable diversity. Its capacity to explore a vast range of beam parameters is truly unparalleled, spanning from the minute energies of around a few keV and microampere antiproton beams, decelerated within the CERN antimatter factory, to the 6.8 TeV high-intensity proton beams that race through the Large Hadron Collider (LHC). The Super Proton Synchrotron (SPS) ring plays also a crucial role by slowly extracting protons at 400 GeV. These proton currents are then directed toward various targets, generating all sorts of secondary particle beams. These beams, in turn, become the foundation of a diverse fixed-target research program, enabling scientific exploration across a wide spectrum. Moreover, as CERN looks ahead to future studies involving electron-positron colliders, the development of cutting-edge diagnostics for low emittance, short electron pulses is also underway. This contribution serves as a snapshot, shedding light on the main R&D initiatives currently underway at CERN in the field of beam instrumentation.
	Poster MOP009 [13.654 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP009
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023
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MOP010	Diagnostics for a High Emittance and High Energy Spread Positron Source	54
	N. Vallis, P. Craievich, R.F. Fortunati, R. Ischebeck, E. Ismaili, P.N. Juranič, F. Marcellini, G.L. Orlandi, M. Schaer, R. Zennaro, M. Zykova PSI, Villigen PSI, Switzerland
	Funding: This work was done under the auspices of CHART (chart.ch) This paper is an overview of a diagnostics setup for highly spread e⁺e⁻ beams, to be installed at the PSI Positron Production (P³ or P-cubed) experiment. To be hosted at the SwissFEL facility (PSI, Switzerland) in 2026, P³ is e⁺ source demonstrator designed to generate, capture, separate and detect nano-Coulombs of secondary e⁺ and e^- bunches, in spite of their extreme tranverse emittance and energy spread. The experiment will employ an arrangement of broadband pick-ups (BBPs) to detect simultaneously the time structure of secondary e⁺e⁻ bunches. A spectrometer will follow the BBPs and deflect the e⁺ and e^- onto two unconventional faraday cups that will measure their charge. In addition, the energy spectrum of e⁺ and e^- distribution will be reconstructed through scintillating fibers.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP010
About •	Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023
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MOP011	Safety Considerations for Shield Door Control Systems	59
	H.A. Watkins, W.C. Barkley, C.D. Hatch, D. Martinez, D. Rai, E.I. Simakov LANL, Los Alamos, New Mexico, USA
	Funding: Los Alamos National Lab LDRD The Accelerator Operations and Technology division is upgrading the control system for a 33-ton shield door that will be used when the Cathodes and RF Interactions in Extremes (CARIE) accelerator begins operations. The door was installed in the 1990¿s but safety standards such as ISO 13849-1 have since emerged which provide safety requirements and guidance on the principles for the design and integration of safety-related parts of a control system. Applying this standard, a safety controller, safety relays and a light curtain barrier have been added to eliminate injury and exposure of personnel to potential hazards during door operations. LANL Report #: LA-UR-23-25064
	Poster MOP011 [0.827 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP011
About •	Received ※ 31 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023
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MOP012	Design Status of the Electron-Ion Collider Beam Instrumentation
	D.M. Gassner, B. Bacha, G. Bassi, K.A. Drees, S.H. Hafeez, D. Holmes, R.L. Hulsart, P. Inacker, C. Liu, R.J. Michnoff, M.G. Minty, D. Padrazo, M.C. Paniccia, I. Pinayev, J.A. Pomaro, A.C. Pramberger, M.P. Sangroula, P. Thieberger, E. Wang, F.J. Willeke BNL, Upton, New York, USA J.R. Bellon, A. Blednykh, C. Hetzel, F. Micolon, C. Montag, V. Ptitsyn, V.H. Ranjbar Brookhaven National Laboratory (BNL), Electron-Ion Collider, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy The Electron Ion Collider (EIC) is being built at Brookhaven National Laboratory (BNL). Early preliminary design phase efforts are underway. In addition to upgrading the existing RHIC instrumentation for the EIC hadron storage ring, new electron accelerator subsystems that include a 400 MeV Linac, rapid-cycling synchrotron, electron storage ring, and a strong hadron cooling facility will have all new instrumentation systems. The scope of the instrumentation includes devices to measure beam position, loss, current, charge, tune, transverse and longitudinal profiles, emittance, and crabbing angles. A description of the planned instruments and the present design status will be presented.
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MOP013	Expansion of the MTCA Based Direct Sampling LLRF at MedAustron for Hadron Synchrotron Applications	63
	M. Wolf, M. Cerv, C. Kurfürst, S. Myalski, M. Repovž, C. Schmitzer EBG MedAustron, Wr. Neustadt, Austria A. Bardorfer, B. Baričevič, P. Leban, P. Paglovec, M. Škabar I-Tech, Solkan, Slovenia
	The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility located in Lower Austria, which delivers proton and carbon ion beams for cancer treatments. Currently the facility treats over 400 patients per year and is expected to double this number in the future. Six years since the start of clinical operation, MedAustron is experiencing end-of-life issues concerning the digital Low Level RF components in the injector and the synchrotron. Replacements for these applications are under development and the chosen hardware is suitable to also update multiple beam diagnostic devices in the facility. Main targets for updates are the Schottky monitors, which were never properly integrated into the MedAustron Control system and the position pickup measurement system, which currently does not support turn by turn measurements. Comparison measurements with other state of the art diagnostic devices are ongoing to demonstrate the capabilities of the generic hardware. Furthermore, these measurements should show the increased usability and diagnostic potential compared to the legacy devices.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP013
About •	Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
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MOP015	RF Calibration and Distribution devices for SPIRAL2 BPMs
	C. Jamet, T. Andre, P. Legallois, S. Leloir, C. Potier de courcy GANIL, Caen, France
	In order to achieve the required measurement accuracy for the SPIRAL2 BPMs in positions, ellipticities and phases, new RF Calibration and Distribution devices were developed, tested and installed on the SPIRAL2 Facility in 2022. Accuracy measurements depends on gain and phase differences of the 4 BPM measurement channels. In order to compensate analogic differences, digital corrections are applied in function of the calibration results. One of the main objectives was to automate the different steps of the calibration process in order to reduce the calibration time and avoid cable connections and disconnections. The second objective was to distribute RF reference signals to all BPM electronics cards with the same amplitudes and phases. This document describes technical solutions and qualifications performed, explains the calibration process, corrections and results obtained.
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MOP018	Beam-diagnostic and T0 System for the mCBM and CBM Experiments at GSI and FAIR	66
	A. Rost, A. Senger FAIR, Darmstadt, Germany T. Galatyuk, M. Kis, J. Pietraszko, J. Thaufelder, F. Ulrich-Pur GSI, Darmstadt, Germany T. Galatyuk, V. Kedych, W. Krüger TU Darmstadt, Darmstadt, Germany
	Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 871072. The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt requires a highly accurate beam monitoring and time-zero (T0) system. This system needs to meet the requirements of the CBM time-of-flight (ToF) measurement system for both proton and heavy ion beams, while also serving as part of the fast beam abort system. To achieve these goals, a detector based on chemical vapor deposition (CVD) diamond technology has been proposed. In addition, new developments using Low Gain Avalanche Detectors (LGADs) are currently under evaluation. This contribution presents the current development status of the beam detector concept for the CBM experiment.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP018
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 30 September 2023
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MOP019	First Test with MicroTCA Based Cavity BPM Electronics for the European XFEL and FLASH	70
	B. Lorbeer, H.T. Duhme, I. Krouptchenkov, T. Lensch, D. Lipka, M. Werner DESY, Hamburg, Germany
	The European X-ray free-electron laser (E-XFEL) and the FLASH2020+ project for the free electron laser Hamburg (FLASH) at DESY in Hamburg, Germany foresee several machine upgrades in the years to come. At FLASH a whole undulator section in a shutdown starting in summer 2024 and finishing in autumn 2025 is going to be rebuild. Existing button beam position monitors installed in this section of the machine do not deliver sufficient signal strength for future required resolution specification and orbit feedback optimization for machine operation. The resolution limitations will be overcome by replacing the button-based beam position monitors with in-house developed cavity beam position monitors and compact microTCA based radio frequency receiver read-out electronics. The measurement system has been tested and evaluated in a test setup at FLASH.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP019
About •	Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 21 September 2023 — Issue date ※ 30 September 2023
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MOP021	New Beam Position Monitor System for PETRA IV
	J.L. Lamaack University of Hamburg, Hamburg, Germany A. Bardorfer, L. Bogataj, M. Cargnelutti, P. Leban, M.O. Oblak, P. Paglovec, B. Repič I-Tech, Solkan, Slovenia H.T. Duhme, G. Kube, F. Schmidt-Föhre, K. Wittenburg DESY, Hamburg, Germany
	The PETRA IV project at DESY aims to upgrade the present synchrotron radiation source PETRA III into a source of ultra-low emittance with target emittance of 20 pmrad. The small beam emittance translates directly into much smaller beam sizes of about 7 microns horizontally and 3 microns vertically at insertion device source points, thus imposing stringent requirements on the machine’s stability. In order to measure beam position and control orbit stability to the required level of accuracy, a high-resolution BPM system consisting of 790 individual monitors will be installed. Its readout electronics will be based on MTCA.4 as a technical platform. To fulfill the long-term drift requirement (< 1 micron over 7 days), the concept of crossbar-switching was extended in such a way that the RF switch matrix is separated from the readout electronics and placed as close to the BPM pickup as possible, therefore enabling additional stabilization of the RF cables. At present, a fully populated MTCA.4 crate with 6 AMC boards for the readout of 12 BPMs is installed at PETRA III and extensively tested. This contribution summarizes the latest measurements of the long term stability.
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MOP022	Replacement of the Single-Pass BPM System with MicroTCA.4-based Versatile Electronics at SPring-8	74
	H. Maesaka, N. Hosoda, S. Takano RIKEN SPring-8 Center, Hyogo, Japan H. Dewa, T. Fujita, N. Hosoda, H. Maesaka, M. Masaki, S. Takano JASRI, Hyogo, Japan
	We have developed MicroTCA.4-based versatile BPM readout electronics for the SPring-8 upgrade project, SPring-8-II (). The input signals are processed by an rf front-end rear transition module (RTM) with band-pass filters, amplifiers, and step attenuators and digitized by 16-bit 370 MSPS high-speed digitizers on an advanced mezzanine card (AMC). The field-programmable gate array (FPGA) on the AMC calculates both single-pass and COD beam positions. The current BPM system at SPring-8 consists of approximately twenty single-pass dedicated BPMs and over two hundred other COD dedicated ones. In advance of SPring-8-II, so far, we renewed half of the single-pass dedicated BPM electronics to the MicroTCA.4. A graphical user interface (GUI) for the new BPM system was also developed and ready for tuning. The single-pass BPM resolution was confirmed to be better than 100 um for a 100 pC single bunch, sufficient for SPring-8-II. The other existing single-pass BPM electronics will also be renewed this summer. The full renewal of remaining COD dedicated BPM electronics to the versatile MicroTCA.4 ones is planned in the subsequent years before the construction of SPring-8-II. () H. Maesaka et al., "Development of MTCA.4-based BPM Electronics for SPring-8 Upgrade", Proc. IBIC’19, doi:10.18429/JACoW-IBIC2019-WEBO03
	Poster MOP022 [1.074 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP022
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 30 September 2023
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MOP023	The Conceptual Design Study for New BPM Signal Processing System of J-PARC (MR)	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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MOP024	The Design and Optimization of Digital Beam Position Monitor Processor in HEPS
	Y.Y. Du, J.S. Cao, Z. Liu, Y.F. Sui, S.J. Wei, Q. Ye, J.H. Yue IHEP, Beijing, People’s Republic of China
	The Digital Beam Position Monitor (DBPM) is an important component of the High Energy Photon Source (HEPS). This article mainly introduces the design and development of the digital beam position measurement system based on the main indicators of HEPS, including the overall architecture design of the system, digital electronics design, RF electronics design, and the exposition of core algorithm design. It also provides a detailed performance comparison between the two versions of electronic design before and after optimization, including performance indicators such as flow-dependent, long-term stability, and position resolution. In laboratory testing, under the condition of an input signal of 499.8MHz and K factor is 8.26, the position resolution per turn by turn (TBT) is less than 1um, the fast orbit position resolution (FA) is less than 100nm, and the closed orbit position resolution (SA) is less than 10nm. The beam current-dependence and long-term stability are significantly better than the previous version, and the test results meet the design requirements of the High Energy Photon Source.
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MOP026	A Novel BPM Mechanical Center Calibration Method Based on Laser Ranging	82
	X.H. Tang, J.S. Cao, Y.Y. Du, J. He, Y.F. Sui, J.H. Yue IHEP, Beijing, People’s Republic of China
	Determining the mechanical center of the beam position monitor(BPM) has been a difficulty for BPM calibration. To solve this problem, a method of positioning the BPM mechanical center based on laser ranging is proposed. This method uses high-precision antenna support as the core locating datum, and high-precision laser ranging sensors(LRSs) as the detection tool. By detecting the distances from the LRSs to the antenna support and the distances from the LRSs to the BPM, the mechanical center of the BPM can be indirectly determined. The theoretical system error of this method is within 20¿m, and the experimental results show that the measurement repeatability is less than 40¿m, This method has low cost and fast speed, which can be used for large-scale calibration.
	Poster MOP026 [1.142 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP026
About •	Received ※ 13 July 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023
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MOP028	The Design of Button Beam Position Monitor for Shenzhen Innovation Light-Source Facility
	T. Yu IASF, Shenzhen, Guangdong, People’s Republic of China
	Shenzhen Innovation Light-source Facility (SILF) is a brand new project supported by the Chinese government to build a 4th generation synchrotron radiation source whose storage ring is so-called diffraction-limited. The beam design is that the emission is less than 100 pm·rad, and the beam instability is less than 10% of the beam spot. Therefore, the revolution of the beam position monitor (BPM) needs to be less than 0.12 ¿m for closed orbit detection. In order to achieve such excellent resolution, the signal-to-noise ratio of the BPM output signal in the 10MHz bandwidth is required to be better than 66dB. After the finite element numerical analysis, the diameter of the pickup electrode will be 8mm, and the gap between the electrode and the vacuum chamber will be 0.3 mm.
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MOP029	A Novel Design of a Dielectric-filled Cavity BPM for HUST-PTF
	J.Q. Li, K. Fan, J. Wang HUST, Wuhan, People’s Republic of China
	To guarantee proton therapy safety and effectivity, non-invasive beam diagnostic¿NBD¿ devices are mandatory to precisely monitor the beam parameters during patient treatment. However, the clinical proton beams have characters of low currents and frequencies, which impose challenges for the design to improve the diagnosis resolution. A dielectric-filled racetrack cavity-type BPM has been studied deeply to compact its size while maintaining high diagnosis sensitivity. Moreover, the cross-talk between X and Y directions is effectively suppressed to ensure the diagnosis precision. The simulation and calculation results show that the cavity BPM has sufficient position sensitivity and signal-to-noise ratio. The signal-to-noise ratio can ba as large as 16.2 even when the beam intensity is 0.35 nA. The design studies results show that the dielectric-filled racetrack cavity is a potential candidate for a non-destructive beam position detector in HUST-PTF.
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MOP030	Developments of 4GSR BPM Electronics	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 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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MOP031	A Study Into the Long-Term Stability of Front End X-Ray Beam Position Monitor Support Columns at Diamond Light Source	90
	C.E. Houghton, C. Bloomer, L. Bobbpresenter, D. Crivelli, J.E. Melton, H. Patel DLS, Harwell, United Kingdom
	Sand-filled steel columns are used at Diamond Light Source to support front end X-ray beam position monitors. This approach is chosen due to the relatively large thermal mass of the sand being considered useful to reduce the rate at which expansion and contraction of the column occurred as the storage ring tunnel temperature varied, particularly during machine start-up. With the higher requirements for mechanical stability for the upcoming Diamond-II upgrade, there is now a need to assess and quantify the current system’s impact on X-ray beam movement. A study of thermal and mechanical stability has been carried out to quantify the stability performance of the front end X-ray beam position monitor’s columns and the impact that column motion may have on the X-ray beam position measurement. Measurements have been made over a range of different timescales, from 250 Hz up to 2 weeks. The measured stability of the support column is presented, showing that it meets our Diamond-II stability requirements. A comparison of the stability of the column with and without a sand filling is presented.
	Poster MOP031 [0.594 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP031
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023
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MOP032	One Dimensional Beam Position Monitor Prototype using Incoherent Cherenkov Diffraction Radiation	94
	A.J. Clapp Royal Holloway, University of London, Surrey, United Kingdom L. Bobb, G. Cook DLS, Oxfordshire, United Kingdom P. Karataev JAI, Egham, Surrey, United Kingdom
	This paper proposes a novel advancement in both the studies of Cherenkov diffraction radiation (ChDR) and beam instrumentation. The proposed beam position monitor (BPM) consists of two identical fused Silica prism radiators, with a fibre collimator attached to each one, which in turn are connected to a photodetector via a series of optical fibres. The setup will be implemented into the booster to storage ring transfer line at Diamond Light Source ¿ an electron light source with 3 GeV beam energy. The prototype proposed aims to test the feasibility of a full BPM utilising ChDR. If proven to be fully realisable, optical rather than capacitive BPM pickups could be more widely distributed. The paper will include the complete design and preliminary results of a one-dimensional BPM, utilising the ChDR effect.
	Poster MOP032 [2.516 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP032
About •	Received ※ 26 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023
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MOP033	1L Target Harp Diagnostic Display Tool	99
	A.D. Walker, E.L. Kerstiens LANL, Los Alamos, New Mexico, USA
	The Los Alamos Neutron Science Center (LANSCE) completed upgrades to its 1L Target Facility, which included installing the new Mark IV target assembly. This added a third tungsten target located upstream of the other two targets. Prior to Mark IV, beam centering on target was achieved by using thermocouples mounted to the quadrants and center of the upper target coolant chamber. It is slightly offset from center of the old upper target and it shadows several of the thermocouples previously used to center beam on target. This required adjustments to the diagnostic tools utilized to monitor position of the H⁻ beam that is being delivered to the 1L target. The original display included the thermocouple readouts and displayed a visual beam profile and position taken from an upstream harp. With some of the thermocouples now being shadowed, an image overlay was added to show where the harp¿s measured beam position is relative to both the upper and middle targets. This gives the beam operations team an additional level of awareness when it comes to thermocouple temperatures, beam steering, and beam tuning. Details of the display tool and its associated upgrades are presented. LANL Report #: LA-UR-23-25004
	Poster MOP033 [0.825 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP033
About •	Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
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MOP036	A New Approach for Canadian Light Source Future Orbit Correction System Driven by Neural Network	102
	S. Saadat, M.J. Boland CLS, Saskatoon, Saskatchewan, Canada M.J. Boland University of Saskatchewan, Saskatoon, Canada
	The Orbit Correction System (OCS) of the CLS comprises 48 sets of BPMs. Each BPM has the ability to measure the position of the beam in both the X-Y directions and can record data at a rate of 900 times per second. The Inverse Response Matrix is utilized to determine the optimal strength of the 48 sets of orbit correctors in both the X-Y directions, in order to ensure that the beam follows its desired path. The Singular Value Decomposition function is replaced by a neural network algorithm to serve as the brain of the orbit correction system in this study. The training model’s design includes three hidden layers, and within each layer, there are 96 nodes. The neural network’s outputs for regular operations in CLS exhibit a Mean Square Error of 10^-7. Various difficult scenarios were created to test the OCS at 8.0 mA, using offsets in different sections of the storage ring. However, the new model was able to produce the necessary Orbit Correctors signals without any trouble.
	Poster MOP036 [1.438 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP036
About •	Received ※ 14 July 2023 — Revised ※ 09 September 2023 — Accepted ※ 28 September 2023 — Issue date ※ 30 September 2023
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MOP037	Tune Feedback at the Canadian Light Source	106
	W.A. Wurtz, C.K. Baribeau, A.M. Duffy CLS, Saskatoon, Saskatchewan, Canada
	In order to maintain good injection efficiency for top-up operation at the Canadian Light Source, we must keep the betatron tunes constant even as changes in insertion device fields cause the tunes to vary. To meet this requirement, we implemented a tune feedback system. We measure the tunes at a rate of 1 Hz using Dimtel bunch-by-bunch systems. The transverse feedback function of the bunch-by-bunch systems provides tune measurements without disturbing the electron beam. We adjust two quadrupole families at a rate of 0.25 Hz to control the horizontal and vertical tunes. In this article we describe the tune feedback system, its development and its performance. The system has proven to be very robust, enabling reliable top-up operation.
	Poster MOP037 [1.284 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP037
About •	Received ※ 24 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 21 September 2023
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MOP038	Development of an Active Beam-Stabilization System for Electrofission Experiments at the S-Dalinac	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 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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MOP039	Transverse Multi-Bunch Feedback Detector Electronics Using Direct Sampling Analog-to-Digital Converters for the Synchrotron Radiation Source PETRA IV	115
	S. Jabłoński, H.T. Duhme, U. Mavrič, S. Pfeiffer, H. Schlarb DESY, Hamburg, Germany
	PETRA IV, a new fourth generation synchrotron radiation source planned at DESY, will require a transverse multi-bunch feedback (T-MBFB) system to damp transverse instabilities and keep the beam emittance low. The critical part of the T-MBFB is a detector that must measure bunch-by-bunch, i.e. every 2 ns, beam position variations with the resolution not worse than 1 ¿m for the dynamic beam range of ±1 mm. In this paper, we present the conceptual design of the T-MBFB detector from the beam position pickups to the direct sampling ADCs. We analyse the noise sources limiting the detector resolution and present measurement results based on the evaluation modules.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP039
About •	Received ※ 01 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 01 October 2023
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MOP041	Modified Fast Orbit Feedback Controller for Disturbance Attenuation in Long Straights for Diamond-II	119
	S. Banerjee, M.G. Abbott, L. Bobb, I. Kempfpresenter DLS, Harwell, United Kingdom I. Kempfpresenter 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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MOP043	Using Lag Compensator in Orbit Feedback	123
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Growing demand on the beam orbit stability requires higher loop gain within the operational bandwidth. Increasing the gain leads to the increase of the unity gain frequency and creates problems with systems stability due to the additional phase shifts caused by the trims (power supplies, eddy currents in vacuum chambers, etc.) and filtering of beam position data. Conventionally employed systems have 20 dB/decade slope near the unity gain providing 90 degrees phase shift which is sufficient for stability. Utilizing one or more lag compensators allows to increase the gain at low frequencies while keeping phase margin acceptable. The paper provides more details on the proposed solution as well as simulations of how the transients will be modified.
	Poster MOP043 [0.230 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP043
About •	Received ※ 25 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 23 September 2023
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MOP044	"Instantaneous" Lifetime Measurement in Storage Ring with Top-Up Injection	125
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Top-up operation becomes routine in the light sources. The goal of the top-up operation is to keep the current of the circulating beam stable to avoid variations of the heat load on the beamline optics. It is also considered for the electron-ion collider to maintain the polarization of the electron beam. Frequent re-injection makes measurement of the beam lifetime very difficult if possible. Since, only part of the bunch train is refreshed during the injection cycle then the distribution of the bunch charges in the train has a characteristic saw-tooth distribution. The slope of saw tooth and step in the bunch charge distribution is defined by the lifetime and filling frequency. Both parameters can be used for the measurement. The data for processing can be obtained either from fast current transformer or from the raw ADC signal from beam position monitor. In this paper we present the theoretical considerations as well as experimental data from NSLS-II storage ring.
	Poster MOP044 [0.284 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP044
About •	Received ※ 25 August 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 18 September 2023
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MOP045	Robust Emittance Measurements	127
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy The quadrupole scan is commonly used for measurement of beam emittance. The found dependence of the beam size vs. quadrupole strength is fitted with parabola, which coefficients are used for emittance calculations. The measurement errors can cause substantial variations in the emittance value. Sometimes the fitted parabola has negative minimum value, making impossible emittance calculation. We propose more robust data processing using weighted fit for parabola or modifying the quadrupole scan procedure. The experimental results are presented.
	Poster MOP045 [0.255 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP045
About •	Received ※ 25 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 28 September 2023
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MOP046	Measurement of Slice Emittance with Deflecting Cavity and Slit	129
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Coherent Electron Cooling experiment carried out at RHIC requires small slice emittance of 15 MeV electron beam with high peak current. In this paper we describe the system for slice emittance measurement utilizing transverse deflecting cavity and slit. The image of the beam passing through the slit is used to measure slice intensity and angular divergence. Beam size at slit location is measured using scan of the beam across the slit with trim. The angular kick by the trim is taken into the account during calculations. Data processing and the experimental results are presented.
	Poster MOP046 [0.997 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP046
About •	Received ※ 28 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 19 September 2023
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Paper

Title

Page

Current Status of the HESR Beam Instrumentation

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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MOP002

MiniBEE - Minibeam Beamline for Preclinical Experiments

34

J. Reindl, G. Datzmann, G. Dollinger, J. Neubauer, A. Rousseti
Universität der Bundeswehr Muenchen, Neubiberg, Germany
J. Bundesmann, A. Denker, A. Dittwald, G. Kourkafas
HZB, Berlin, Germany
G. Datzmann
Datzmann Interact & Innovate GmbH, München, Germany
A. Denker
BHT, Berlin, Germany

Spatial fractionated radiotherapy using protons, so-called proton minibeam radiotherapy (pMBT) was developed for better sparing of normal tissue in the entrance channel of radiation. Progressing towards clinical use, pMBT should overcome current technical and biomedical limitations. This work discusses a preclinical pMBT facility, currently built at the 68.5MeV cyclotron at the Helmholtz Zentrum Berlin. The goal is to irradiate small animals using focused pMBT with a σ of 50µm, a high peak-to-valley dose ratio at center-to-center distance as small as 1mm and beam current of 1nA. A first degrader defines the maximum energy of the beam. Dipole magnets and quadrupole triplets transport the beam to the treatment room while multiple slits properly form the transverse beam profiles. A high magnetic field gradient triplet lens forms the minibeams in front of the target station and, scanning magnets are used for a raster scan at the target. An additional degrader, positioned close before the focusing spot and the target, further reduces the energy, forming a spread-out Bragg peak. A small animal radiation research platform will be used for imaging and positioning of the target.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP002

About •

Received ※ 09 September 2023 — Revised ※ 14 September 2023 — Accepted ※ 25 September 2023 — Issue date ※ 29 September 2023

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MOP003

Design of HEPS Storage Ring Beam Instrumentation

J.H. Yue, J.S. Cao, Y.Y. Du, J. He, F. Liu, X.Y. Liu, Z. Liu, Y.H. Lu, H.Z. Ma, Y.F. Sui, L. Wang, S.J. Wei, T.G. Xu, Q. Ye, L. Yu, W. Zhang, Y. Zhao, D.C. Zhu
IHEP, Beijing, People’s Republic of China
A.X. Wang
USTC/NSRL, Hefei, Anhui, People’s Republic of China

HEPS is a fourth generation light source which has horizontal emittance around 34pm.rad to gain the high brilliance photon beam, this ultra-low emittance brings many engineering challenges for beam instrumentation. The resolution of the beam position measurement and the beam size measurement is need to reach sub-micro meter. The large current and multi-bunches need bunch by bunch feedback system to cure instabilities. This paper will present an overview of beam instrumentation

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MOP004

Design and Study of Cavity Quadrupole Moment and Energy Spread Monitor

37

Q. Wang, Q.Y. Dong, L.T. Huang
DICP, Dalian, Liaoning, People’s Republic of China
Q. Luo
USTC/NSRL, Hefei, Anhui, People’s Republic of China

A nondestructive method to measure beam energy spread using the quadrupole modes within a microwave cavity is proposed. Compared with a button beam position monitor (BBPM) or a stripline beam position monitor (SBPM), the cavity monitor is a narrow band pickup and therefore has better signal-to-noise ratio (SNR) and resolution. In this study, a rectangular cavity monitor is designed. TM220 mode operating at 4.76 GHz in the cavity reflects the quadrupole moment of the beam. The cavity plans to be installed behind a bending magnet in Dalian Coherent Light Source (DCLS), an extreme ultraviolet FEL facility. In this position, the beam has a larger dispersion, which is beneficial to measure the energy spread. A quadrupole magnet, a fluorescent screen, and a SBPM with eight electrodes is installed near the cavity for calibration and comparison. The systematic framework and simulation results are also discussed in this paper.

Poster MOP004 [0.882 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP004

About •

Received ※ 13 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 28 September 2023

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MOP006

Design Overview of the Electron Storage Ring Instrumentation System for Hefei Advanced Light Factory

B.G. Sun, Y.B. Leng, Y. Liang, P. Lu, Q. Luo, L.L. Tang, A.X. Wang, J. Wang, T.Y. Zhou, Z.R. Zhou
USTC/NSRL, Hefei, Anhui, People’s Republic of China

The Hefei Advanced Light Factory (HALF) is a diffraction-limited storage ring with a beam energy of 2.2 GeV. Based on the beam related technical parameters and requirements provided by the physical design of the HALF storage ring, the storage ring beam instrumentation system mainly includes beam position measurement system, DC current measurement system, bunch-by-bunch beam current measurement system, tune measurement system, beam profile measurement system, bunch length measurement system, bunch-by-bunch feedback system, fast orbit feedback system, BPM displacement measurement system, and beam loss measurement. An overview of the design of the storage ring instrumentation system will be presented.

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MOP007

Experimental Verification of the Coherent Diffraction Radiation Measurement Method for Longitudinal Electron Beam Characteristics

41

R. Panaś, A.I. Wawrzyniak
NSRC SOLARIS, Kraków, Poland
A. Curcio
LNF-INFN, Frascati, Italy
K. Łasocha
CERN, Meyrin, Switzerland

This paper presents a natural extension of prior theoretical investigations regarding the utilization of coherent diffraction radiation for assessing longitudinal characteristics of electron beams at Solaris. The study focuses on the measurement results obtained at the linac injector of the Solaris synchrotron and their analysis through a theoretical model. The findings are compared with previous estimates of the electron beam longitudinal profile. This paper contributes to the future diagnostics at the first Polish free electron laser (PolFEL) project, where it will be used for the optimization of particle accelerator performance.

Poster MOP007 [20.060 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP007

About •

Received ※ 02 August 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 26 September 2023

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MOP008

Consideration of Beam Instrumentation for SOLARIS Linac Upgrade

45

A.I. Wawrzyniak, J.B. Biernat, R. Panaś, J.J. Wiechecki, M.T. Ünal
NSRC SOLARIS, Kraków, Poland
A. Curcio
LNF-INFN, Frascati, Italy

SOLARIS linac currently operates at 540 MeV and is used as an injector to the storage ring, where after the accumulation the energy is ramped up to 1.5 GeV via two active RF cavities. Top-up injection would be of extreme benefits for user operation, therefore a new 1.5 GeV linac is being designed. The idea is to replace the current machine without infrastructural interventions in terms of tunnel expansion. Performed studies demonstrate that the best solution is provided by a Hybrid S-band/C-band LINAC. One of the main goals is to achieve bunch compression below the picosecond level and low-emittance beams for a future short-pulse facility or a Free Electron Laser. Within this presentation the results of performed simulations will be presented together with the concept of different diagnostics as BPMs, current transformers, YAG screens, coherent diffraction radiation monitor distribution.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP008

About •

Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023

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MOP009

A Snapshot of CERN Beam Instrumentation R&D Activities

49

T. Lefèvre, D. Alves, A. Boccardi, S. Jackson, F. Roncarolo, J.W. Storey, R. Veness, C. Zamantzas
CERN, Meyrin, Switzerland

The CERN accelerator complex stands out as an unique scientific tool, distinguished by its scale and remarkable diversity. Its capacity to explore a vast range of beam parameters is truly unparalleled, spanning from the minute energies of around a few keV and microampere antiproton beams, decelerated within the CERN antimatter factory, to the 6.8 TeV high-intensity proton beams that race through the Large Hadron Collider (LHC). The Super Proton Synchrotron (SPS) ring plays also a crucial role by slowly extracting protons at 400 GeV. These proton currents are then directed toward various targets, generating all sorts of secondary particle beams. These beams, in turn, become the foundation of a diverse fixed-target research program, enabling scientific exploration across a wide spectrum. Moreover, as CERN looks ahead to future studies involving electron-positron colliders, the development of cutting-edge diagnostics for low emittance, short electron pulses is also underway. This contribution serves as a snapshot, shedding light on the main R&D initiatives currently underway at CERN in the field of beam instrumentation.

Poster MOP009 [13.654 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP009

About •

Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023

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MOP010

Diagnostics for a High Emittance and High Energy Spread Positron Source

54

N. Vallis, P. Craievich, R.F. Fortunati, R. Ischebeck, E. Ismaili, P.N. Juranič, F. Marcellini, G.L. Orlandi, M. Schaer, R. Zennaro, M. Zykova
PSI, Villigen PSI, Switzerland

Funding: This work was done under the auspices of CHART (chart.ch)
This paper is an overview of a diagnostics setup for highly spread e⁺e⁻ beams, to be installed at the PSI Positron Production (P³ or P-cubed) experiment. To be hosted at the SwissFEL facility (PSI, Switzerland) in 2026, P³ is e⁺ source demonstrator designed to generate, capture, separate and detect nano-Coulombs of secondary e⁺ and e^- bunches, in spite of their extreme tranverse emittance and energy spread. The experiment will employ an arrangement of broadband pick-ups (BBPs) to detect simultaneously the time structure of secondary e⁺e⁻ bunches. A spectrometer will follow the BBPs and deflect the e⁺ and e^- onto two unconventional faraday cups that will measure their charge. In addition, the energy spectrum of e⁺ and e^- distribution will be reconstructed through scintillating fibers.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP010

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Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 25 September 2023

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MOP011

Safety Considerations for Shield Door Control Systems

59

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

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

Poster MOP011 [0.827 MB]

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

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

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MOP012

Design Status of the Electron-Ion Collider Beam Instrumentation

D.M. Gassner, B. Bacha, G. Bassi, K.A. Drees, S.H. Hafeez, D. Holmes, R.L. Hulsart, P. Inacker, C. Liu, R.J. Michnoff, M.G. Minty, D. Padrazo, M.C. Paniccia, I. Pinayev, J.A. Pomaro, A.C. Pramberger, M.P. Sangroula, P. Thieberger, E. Wang, F.J. Willeke
BNL, Upton, New York, USA
J.R. Bellon, A. Blednykh, C. Hetzel, F. Micolon, C. Montag, V. Ptitsyn, V.H. Ranjbar
Brookhaven National Laboratory (BNL), Electron-Ion Collider, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
The Electron Ion Collider (EIC) is being built at Brookhaven National Laboratory (BNL). Early preliminary design phase efforts are underway. In addition to upgrading the existing RHIC instrumentation for the EIC hadron storage ring, new electron accelerator subsystems that include a 400 MeV Linac, rapid-cycling synchrotron, electron storage ring, and a strong hadron cooling facility will have all new instrumentation systems. The scope of the instrumentation includes devices to measure beam position, loss, current, charge, tune, transverse and longitudinal profiles, emittance, and crabbing angles. A description of the planned instruments and the present design status will be presented.

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MOP013

Expansion of the MTCA Based Direct Sampling LLRF at MedAustron for Hadron Synchrotron Applications

63

M. Wolf, M. Cerv, C. Kurfürst, S. Myalski, M. Repovž, C. Schmitzer
EBG MedAustron, Wr. Neustadt, Austria
A. Bardorfer, B. Baričevič, P. Leban, P. Paglovec, M. Škabar
I-Tech, Solkan, Slovenia

The MedAustron Ion Therapy Centre is a synchrotron-based particle therapy facility located in Lower Austria, which delivers proton and carbon ion beams for cancer treatments. Currently the facility treats over 400 patients per year and is expected to double this number in the future. Six years since the start of clinical operation, MedAustron is experiencing end-of-life issues concerning the digital Low Level RF components in the injector and the synchrotron. Replacements for these applications are under development and the chosen hardware is suitable to also update multiple beam diagnostic devices in the facility. Main targets for updates are the Schottky monitors, which were never properly integrated into the MedAustron Control system and the position pickup measurement system, which currently does not support turn by turn measurements. Comparison measurements with other state of the art diagnostic devices are ongoing to demonstrate the capabilities of the generic hardware. Furthermore, these measurements should show the increased usability and diagnostic potential compared to the legacy devices.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP013

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Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023

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MOP015

RF Calibration and Distribution devices for SPIRAL2 BPMs

C. Jamet, T. Andre, P. Legallois, S. Leloir, C. Potier de courcy
GANIL, Caen, France

In order to achieve the required measurement accuracy for the SPIRAL2 BPMs in positions, ellipticities and phases, new RF Calibration and Distribution devices were developed, tested and installed on the SPIRAL2 Facility in 2022. Accuracy measurements depends on gain and phase differences of the 4 BPM measurement channels. In order to compensate analogic differences, digital corrections are applied in function of the calibration results. One of the main objectives was to automate the different steps of the calibration process in order to reduce the calibration time and avoid cable connections and disconnections. The second objective was to distribute RF reference signals to all BPM electronics cards with the same amplitudes and phases. This document describes technical solutions and qualifications performed, explains the calibration process, corrections and results obtained.

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MOP018

Beam-diagnostic and T0 System for the mCBM and CBM Experiments at GSI and FAIR

66

A. Rost, A. Senger
FAIR, Darmstadt, Germany
T. Galatyuk, M. Kis, J. Pietraszko, J. Thaufelder, F. Ulrich-Pur
GSI, Darmstadt, Germany
T. Galatyuk, V. Kedych, W. Krüger
TU Darmstadt, Darmstadt, Germany

Funding: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 871072.
The Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt requires a highly accurate beam monitoring and time-zero (T0) system. This system needs to meet the requirements of the CBM time-of-flight (ToF) measurement system for both proton and heavy ion beams, while also serving as part of the fast beam abort system. To achieve these goals, a detector based on chemical vapor deposition (CVD) diamond technology has been proposed. In addition, new developments using Low Gain Avalanche Detectors (LGADs) are currently under evaluation. This contribution presents the current development status of the beam detector concept for the CBM experiment.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP018

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Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 30 September 2023

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MOP019

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

70

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

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

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

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

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MOP021

New Beam Position Monitor System for PETRA IV

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

The PETRA IV project at DESY aims to upgrade the present synchrotron radiation source PETRA III into a source of ultra-low emittance with target emittance of 20 pmrad. The small beam emittance translates directly into much smaller beam sizes of about 7 microns horizontally and 3 microns vertically at insertion device source points, thus imposing stringent requirements on the machine’s stability. In order to measure beam position and control orbit stability to the required level of accuracy, a high-resolution BPM system consisting of 790 individual monitors will be installed. Its readout electronics will be based on MTCA.4 as a technical platform. To fulfill the long-term drift requirement (< 1 micron over 7 days), the concept of crossbar-switching was extended in such a way that the RF switch matrix is separated from the readout electronics and placed as close to the BPM pickup as possible, therefore enabling additional stabilization of the RF cables. At present, a fully populated MTCA.4 crate with 6 AMC boards for the readout of 12 BPMs is installed at PETRA III and extensively tested. This contribution summarizes the latest measurements of the long term stability.

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MOP022

Replacement of the Single-Pass BPM System with MicroTCA.4-based Versatile Electronics at SPring-8

74

H. Maesaka, N. Hosoda, S. Takano
RIKEN SPring-8 Center, Hyogo, Japan
H. Dewa, T. Fujita, N. Hosoda, H. Maesaka, M. Masaki, S. Takano
JASRI, Hyogo, Japan

We have developed MicroTCA.4-based versatile BPM readout electronics for the SPring-8 upgrade project, SPring-8-II (*). The input signals are processed by an rf front-end rear transition module (RTM) with band-pass filters, amplifiers, and step attenuators and digitized by 16-bit 370 MSPS high-speed digitizers on an advanced mezzanine card (AMC). The field-programmable gate array (FPGA) on the AMC calculates both single-pass and COD beam positions. The current BPM system at SPring-8 consists of approximately twenty single-pass dedicated BPMs and over two hundred other COD dedicated ones. In advance of SPring-8-II, so far, we renewed half of the single-pass dedicated BPM electronics to the MicroTCA.4. A graphical user interface (GUI) for the new BPM system was also developed and ready for tuning. The single-pass BPM resolution was confirmed to be better than 100 um for a 100 pC single bunch, sufficient for SPring-8-II. The other existing single-pass BPM electronics will also be renewed this summer. The full renewal of remaining COD dedicated BPM electronics to the versatile MicroTCA.4 ones is planned in the subsequent years before the construction of SPring-8-II.
(*) H. Maesaka et al., "Development of MTCA.4-based BPM Electronics for SPring-8 Upgrade", Proc. IBIC’19, doi:10.18429/JACoW-IBIC2019-WEBO03

Poster MOP022 [1.074 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP022

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Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 30 September 2023

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MOP023

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

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.

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

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

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MOP024

The Design and Optimization of Digital Beam Position Monitor Processor in HEPS

Y.Y. Du, J.S. Cao, Z. Liu, Y.F. Sui, S.J. Wei, Q. Ye, J.H. Yue
IHEP, Beijing, People’s Republic of China

The Digital Beam Position Monitor (DBPM) is an important component of the High Energy Photon Source (HEPS). This article mainly introduces the design and development of the digital beam position measurement system based on the main indicators of HEPS, including the overall architecture design of the system, digital electronics design, RF electronics design, and the exposition of core algorithm design. It also provides a detailed performance comparison between the two versions of electronic design before and after optimization, including performance indicators such as flow-dependent, long-term stability, and position resolution. In laboratory testing, under the condition of an input signal of 499.8MHz and K factor is 8.26, the position resolution per turn by turn (TBT) is less than 1um, the fast orbit position resolution (FA) is less than 100nm, and the closed orbit position resolution (SA) is less than 10nm. The beam current-dependence and long-term stability are significantly better than the previous version, and the test results meet the design requirements of the High Energy Photon Source.

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MOP026

A Novel BPM Mechanical Center Calibration Method Based on Laser Ranging

82

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

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

Poster MOP026 [1.142 MB]

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

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

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MOP028

The Design of Button Beam Position Monitor for Shenzhen Innovation Light-Source Facility

T. Yu
IASF, Shenzhen, Guangdong, People’s Republic of China

Shenzhen Innovation Light-source Facility (SILF) is a brand new project supported by the Chinese government to build a 4th generation synchrotron radiation source whose storage ring is so-called diffraction-limited. The beam design is that the emission is less than 100 pm·rad, and the beam instability is less than 10% of the beam spot. Therefore, the revolution of the beam position monitor (BPM) needs to be less than 0.12 ¿m for closed orbit detection. In order to achieve such excellent resolution, the signal-to-noise ratio of the BPM output signal in the 10MHz bandwidth is required to be better than 66dB. After the finite element numerical analysis, the diameter of the pickup electrode will be 8mm, and the gap between the electrode and the vacuum chamber will be 0.3 mm.

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MOP029

A Novel Design of a Dielectric-filled Cavity BPM for HUST-PTF

J.Q. Li, K. Fan, J. Wang
HUST, Wuhan, People’s Republic of China

To guarantee proton therapy safety and effectivity, non-invasive beam diagnostic¿NBD¿ devices are mandatory to precisely monitor the beam parameters during patient treatment. However, the clinical proton beams have characters of low currents and frequencies, which impose challenges for the design to improve the diagnosis resolution. A dielectric-filled racetrack cavity-type BPM has been studied deeply to compact its size while maintaining high diagnosis sensitivity. Moreover, the cross-talk between X and Y directions is effectively suppressed to ensure the diagnosis precision. The simulation and calculation results show that the cavity BPM has sufficient position sensitivity and signal-to-noise ratio. The signal-to-noise ratio can ba as large as 16.2 even when the beam intensity is 0.35 nA. The design studies results show that the dielectric-filled racetrack cavity is a potential candidate for a non-destructive beam position detector in HUST-PTF.

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MOP030

Developments of 4GSR BPM Electronics

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 MOP030 [24.607 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP030

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Received ※ 05 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 19 September 2023

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MOP031

A Study Into the Long-Term Stability of Front End X-Ray Beam Position Monitor Support Columns at Diamond Light Source

90

C.E. Houghton, C. Bloomer, L. Bobbpresenter, D. Crivelli, J.E. Melton, H. Patel
DLS, Harwell, United Kingdom

Sand-filled steel columns are used at Diamond Light Source to support front end X-ray beam position monitors. This approach is chosen due to the relatively large thermal mass of the sand being considered useful to reduce the rate at which expansion and contraction of the column occurred as the storage ring tunnel temperature varied, particularly during machine start-up. With the higher requirements for mechanical stability for the upcoming Diamond-II upgrade, there is now a need to assess and quantify the current system’s impact on X-ray beam movement. A study of thermal and mechanical stability has been carried out to quantify the stability performance of the front end X-ray beam position monitor’s columns and the impact that column motion may have on the X-ray beam position measurement. Measurements have been made over a range of different timescales, from 250 Hz up to 2 weeks. The measured stability of the support column is presented, showing that it meets our Diamond-II stability requirements. A comparison of the stability of the column with and without a sand filling is presented.

Poster MOP031 [0.594 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP031

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Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 17 September 2023

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MOP032

One Dimensional Beam Position Monitor Prototype using Incoherent Cherenkov Diffraction Radiation

94

A.J. Clapp
Royal Holloway, University of London, Surrey, United Kingdom
L. Bobb, G. Cook
DLS, Oxfordshire, United Kingdom
P. Karataev
JAI, Egham, Surrey, United Kingdom

This paper proposes a novel advancement in both the studies of Cherenkov diffraction radiation (ChDR) and beam instrumentation. The proposed beam position monitor (BPM) consists of two identical fused Silica prism radiators, with a fibre collimator attached to each one, which in turn are connected to a photodetector via a series of optical fibres. The setup will be implemented into the booster to storage ring transfer line at Diamond Light Source ¿ an electron light source with 3 GeV beam energy. The prototype proposed aims to test the feasibility of a full BPM utilising ChDR. If proven to be fully realisable, optical rather than capacitive BPM pickups could be more widely distributed. The paper will include the complete design and preliminary results of a one-dimensional BPM, utilising the ChDR effect.

Poster MOP032 [2.516 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP032

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Received ※ 26 August 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 27 September 2023

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MOP033

1L Target Harp Diagnostic Display Tool

99

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

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

Poster MOP033 [0.825 MB]

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

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

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MOP036

A New Approach for Canadian Light Source Future Orbit Correction System Driven by Neural Network

102

S. Saadat, M.J. Boland
CLS, Saskatoon, Saskatchewan, Canada
M.J. Boland
University of Saskatchewan, Saskatoon, Canada

The Orbit Correction System (OCS) of the CLS comprises 48 sets of BPMs. Each BPM has the ability to measure the position of the beam in both the X-Y directions and can record data at a rate of 900 times per second. The Inverse Response Matrix is utilized to determine the optimal strength of the 48 sets of orbit correctors in both the X-Y directions, in order to ensure that the beam follows its desired path. The Singular Value Decomposition function is replaced by a neural network algorithm to serve as the brain of the orbit correction system in this study. The training model’s design includes three hidden layers, and within each layer, there are 96 nodes. The neural network’s outputs for regular operations in CLS exhibit a Mean Square Error of 10^-7. Various difficult scenarios were created to test the OCS at 8.0 mA, using offsets in different sections of the storage ring. However, the new model was able to produce the necessary Orbit Correctors signals without any trouble.

Poster MOP036 [1.438 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP036

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Received ※ 14 July 2023 — Revised ※ 09 September 2023 — Accepted ※ 28 September 2023 — Issue date ※ 30 September 2023

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MOP037

Tune Feedback at the Canadian Light Source

106

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

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

Poster MOP037 [1.284 MB]

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

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

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MOP038

Development of an Active Beam-Stabilization System for Electrofission Experiments at the S-Dalinac

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 MOP038 [1.526 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP038

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Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 23 September 2023

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MOP039

Transverse Multi-Bunch Feedback Detector Electronics Using Direct Sampling Analog-to-Digital Converters for the Synchrotron Radiation Source PETRA IV

115

S. Jabłoński, H.T. Duhme, U. Mavrič, S. Pfeiffer, H. Schlarb
DESY, Hamburg, Germany

PETRA IV, a new fourth generation synchrotron radiation source planned at DESY, will require a transverse multi-bunch feedback (T-MBFB) system to damp transverse instabilities and keep the beam emittance low. The critical part of the T-MBFB is a detector that must measure bunch-by-bunch, i.e. every 2 ns, beam position variations with the resolution not worse than 1 ¿m for the dynamic beam range of ±1 mm. In this paper, we present the conceptual design of the T-MBFB detector from the beam position pickups to the direct sampling ADCs. We analyse the noise sources limiting the detector resolution and present measurement results based on the evaluation modules.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP039

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Received ※ 01 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 01 October 2023

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MOP041

Modified Fast Orbit Feedback Controller for Disturbance Attenuation in Long Straights for Diamond-II

119

S. Banerjee, M.G. Abbott, L. Bobb, I. Kempfpresenter
DLS, Harwell, United Kingdom
I. Kempfpresenter
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.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP041

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Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023

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MOP043

Using Lag Compensator in Orbit Feedback

123

I. Pinayev
BNL, Upton, New York, USA

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

Poster MOP043 [0.230 MB]

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

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

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MOP044

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

125

I. Pinayev
BNL, Upton, New York, USA

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

Poster MOP044 [0.284 MB]

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

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

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MOP045

Robust Emittance Measurements

127

I. Pinayev
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
The quadrupole scan is commonly used for measurement of beam emittance. The found dependence of the beam size vs. quadrupole strength is fitted with parabola, which coefficients are used for emittance calculations. The measurement errors can cause substantial variations in the emittance value. Sometimes the fitted parabola has negative minimum value, making impossible emittance calculation. We propose more robust data processing using weighted fit for parabola or modifying the quadrupole scan procedure. The experimental results are presented.

Poster MOP045 [0.255 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP045

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Received ※ 25 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 28 September 2023

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MOP046

Measurement of Slice Emittance with Deflecting Cavity and Slit

129

I. Pinayev
BNL, Upton, New York, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy
Coherent Electron Cooling experiment carried out at RHIC requires small slice emittance of 15 MeV electron beam with high peak current. In this paper we describe the system for slice emittance measurement utilizing transverse deflecting cavity and slit. The image of the beam passing through the slit is used to measure slice intensity and angular divergence. Beam size at slit location is measured using scan of the beam across the slit with trim. The angular kick by the trim is taken into the account during calculations. Data processing and the experimental results are presented.

Poster MOP046 [0.997 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP046

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Received ※ 28 August 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 19 September 2023

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