IBIC2023 - List of Keywords (vacuum)

Paper	Title	Other Keywords	Page
MOP001	Current Status of the HESR Beam Instrumentation	pick-up, instrumentation, controls, antiproton	29
	C. Böhme FZJ, Jülich, Germany A.J. Halama, V. Kamerdzhiev, G.K. Koch, K. Laihem, K. Reimers GSI, Darmstadt, Germany
	The High Energy Storage Ring (HESR), within the FAIR project, will according to current planning provide anti-proton beams for PANDA and heavy ion beams for i.a. the SPARC experiment. Manufacturing for most of the envisaged beam instrumentation devices in vacuum is completed and testing is well underway. The overall status update of the beam instrumentation devices is presented, with a focus on the test-bench results of the BPMs. In addition, the planned future timeline of the HESR beam instrumentation is briefly reported.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP001
About •	Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 18 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP018	Beam-diagnostic and T0 System for the mCBM and CBM Experiments at GSI and FAIR	detector, target, experiment, monitoring	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP032	One Dimensional Beam Position Monitor Prototype using Incoherent Cherenkov Diffraction Radiation	pick-up, radiation, electron, experiment	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP039	Transverse Multi-Bunch Feedback Detector Electronics Using Direct Sampling Analog-to-Digital Converters for the Synchrotron Radiation Source PETRA IV	detector, electron, electronics, timing	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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP043	Using Lag Compensator in Orbit Feedback	feedback, power-supply, operation, simulation	123
	I. Pinayev BNL, Upton, New York, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-SC0012704 with the U.S. Department of Energy Growing demand on the beam orbit stability requires higher loop gain within the operational bandwidth. Increasing the gain leads to the increase of the unity gain frequency and creates problems with systems stability due to the additional phase shifts caused by the trims (power supplies, eddy currents in vacuum chambers, etc.) and filtering of beam position data. Conventionally employed systems have 20 dB/decade slope near the unity gain providing 90 degrees phase shift which is sufficient for stability. Utilizing one or more lag compensators allows to increase the gain at low frequencies while keeping phase margin acceptable. The paper provides more details on the proposed solution as well as simulations of how the transients will be modified.
	Poster MOP043 [0.230 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP043
About •	Received ※ 25 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 23 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU3I04	Comparison of Different Bunch Charge Monitors Used at the ARES Accelerator at DESY	electron, experiment, cavity, FEL	169
	T. Lensch, D. Lipka, Re. Neumann, M. Werner DESY, Hamburg, Germany
	The SINBAD (Short and INnovative Bunches and Ac-celerators at DESY) facility, also called ARES (Acceler-ator Research Experiment at SINBAD), is a conventional S-band linear RF accelerator allowing the production of lowcharge ultra-short electron bunches within a range of currently 0.01 pC to 250 pC. The R&D accelerator also hosts various experiments. Especially for the medical eFLASH experiment an absolute, non-destructive charge measurement is needed. Therefore different types of monitors are installed along the 45 m long machine: A new Faraday Cup design had been simulated and realized. Further two resonant cavities (Dark Current monitors) and two beam charge transfomers (Toroids) are installed. Both, Dark Current Monitors and Toroids are calibrated independently with laboratory setups. At the end of the accelerator a Bergoz Turbo-ICT is installed. This paper will give an overview of the current installations of charge monitors at ARES and compare their measured linearity and resolution.
	Slides TU3I04 [4.553 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3I04
About •	Received ※ 01 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 29 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP002	Development of Bunch Position Monitors to Observe Sudden Beam Loss of SuperKEKB Rings	luminosity, feedback, detector, operation	179
	M. Tobiyama, H. Ikeda, G. Mitsuka KEK, Ibaraki, Japan
	In the SuperKEKB rings, we have encountered extremely-fast beam losses occurring primarily within one to two turns in some parts of the bunch train. Such ¿sudden beam loss¿ induced severe failure in the vertical collimator heads, quenches on the superconducting final quadrupoles, and damage on the Belle II detector in some cases. Thus it is essential to investigate the cause and take countermeasures. This paper presents the phenomena clarified by the bunch current and position monitor of the bunch feedback system. The upgrade plan for the existing monitor, and recently developed simple monitors installed in the suspected area is also introduced.
	Poster TUP002 [0.727 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP002
About •	Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUP011	Geometry Study of an RF-Window for a GHz Transition Radiation Monitor for Longitudinal Bunch Shape Measurements	radiation, simulation, target, FEL	209
	S. Klaproth, A. Penirschke THM, Friedberg, Germany H. De Gersem TEMF, TU Darmstadt, Darmstadt, Germany R. Singh GSI, Darmstadt, Germany
	Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05P21RORB2. Joint Project 05P2021 - R&D Accelerator (DIAGNOSE) GHz transition radiation monitors (GTRs) can be used to measure longitudinal beam profiles even for low ß beams. In comparison to traditional methods e.g., Fast Faraday Cups (FFCs) and Feschenko monitors, GTRs are a non-destructive measurement method and are able to resolve bunch-by-bunch longitudinal profiles at the same time. In our case, we plan to measure the transition radiation outside the beam line through an RF-window with an 8 GHz broad band antenna. At the border of the RF-window the transition radiation is partially reflected propagating in the beam line backwards. In this contribution, we show a study of different geometries to suppress reflections generated at the transition to the RF-window. For higher permittivity the strength of these reflections becomes stronger, simultaneously reducing the measurable signal strength at the antenna. Secondly the RF-window material must be UHV usable and should be durable like Alumina or Peek.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP011
About •	Received ※ 25 September 2023 — Revised ※ 29 September 2023 — Accepted ※ 30 September 2023 — Issue date ※ 30 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP001	Non-invasive Profilers for the Cold Part of ESS Accelerator	proton, electron, space-charge, linac	326
	J. Marroncle, P. Abbon, F. Belloni, F. Bénédetti, T. Hamelin, J.-Ph. Mols, L. Scola CEA-DRF-IRFU, France B. Bolzon, N. Chauvin, D. Chirpaz-Cerbat, M. Combet, M.J. Desmons, Y. Gauthier, C. Lahonde-Hamdoun, Ph. Legou, O. Leseigneur, Y. Mariette, V. Nadot, M. Oublaid, G. Perreu, F. Popieul, B. Pottin, Y. Sauce, J. Schwindling, F. Senée, O. Tuske, S. Tzvetkov CEA-IRFU, Gif-sur-Yvette, France I. Dolenc Kittelmann, A.A. Gevorgyan, H. Kocevar, R. Tarkeshian, C.A. Thomas ESS, Lund, Sweden
	Several Non-invasive Profile Monitors are being in-stalled along the accelerator to support the commissioning, tuning and operation of the powerful proton based ESS linear accelerator. In the low energy parts of the ESS linac (3.6 MeV to 90 MeV), the residual gas pressure is high enough to measure the transverse beam profile by using fluorescence induced by the beam on the gas molecules. However, in the ESS linac sections above 90 MeV, protons are accelerated by superconductive cavities working at cryogenic temperatures and high vacuum. Therefore, the signal based on the fluorescence process is too weak, while ionization can counteract this drawback. We have provided five IPM (Ionization Profile Monitors) pairs for energies ranging from 100 to 600 MeV. The design of such monitors is challenging due to weak signal (as a result of high proton energy and low pressure <10-9 mbar), tight space constraints inside the vacuum chamber, space charge effect, ISO-5 cleanliness requirement, and electrode polarization at ±15 kV. This publication will detail the development we followed to fulfil the ESS requirements.
	Poster WEP001 [2.190 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP001
About •	Received ※ 03 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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WEP025	A Study of the Gain of Microchannel Plates in the Ionization Profile Monitors at Fermilab	electron, ECR, booster, instrumentation	405
	R.M. Thurman-Keup, C.E. Lundberg, D. Slimmer, J.R. Zagel Fermilab, Batavia, Illinois, USA
	Funding: This work was produced by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. One of the on-going issues with the use of microchannel plates (MCP) in the ionization profile monitors (IPM) at Fermilab is the significant decrease in gain over time. There are several possible issues that can cause this. Historically, the assumption has been that this is aging, where the secondary emission yield (SEY) of the pore surface changes after some amount of extracted charge. Recent literature searches have brought to light the possibility that this is an initial ’scrubbing’ effect whereby adsorbed gasses are removed from the MCP pores by the removal of charge from the MCP. This paper discusses the results of studies conducted on the IPMs in the Main Injector at Fermilab.
	Poster WEP025 [7.408 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP025
About •	Received ※ 08 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 18 September 2023
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WEP027	Status of Gas Sheet Monitor for Profile Measurements at FRIB	photon, simulation, optics, heavy-ion	410
	A. Lokey, S.M. Lidia FRIB, East Lansing, Michigan, USA
	Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University. We report on the status of work on a non-invasive profile monitor under development for use at the Facility for Rare Isotope Beams (FRIB), a heavy-ion LINAC which produces high-intensity, multi-charge state beams. The measurement will be made by collecting photons generated at the interaction point of the beam and a collimated molecular gas curtain. These photons will be collected with an intensified camera system, generating a two dimensional image and allowing for measurements of profile, beam halo, and other properties more prevalent at specific locations of interest, such as charge state spread after folding segment bends. Included will be ongoing design specifications, simulation results, and discussion of measurement techniques for acquiring signal from the device.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP027
About •	Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 14 September 2023
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WEP030	First Results for a 50 MeV Beam Induced Fluorescence Monitor for Beam Profile Measurements	experiment, neutron, diagnostics, operation	418
	G.B. Rosenthal, J.I. Anderson, A. Cao, E. Cramer, T. Gordon, K. Kuhn, O.O. Ledezma Vazquez, J. Lopez, S. Lynam, J.B. Ringuette, L. Szeto, J. Zhou Nusano, Valencia, CA, USA E.F. Dorman, R.C. Emery, B. Smith University of Washington Medical Center, Seattle, Washington, USA
	Nusano is developing a 50 MeV alpha (4He++) particle accelerator, primarily to produce medical radionuclides. The accelerator produces an average current of 3 mAe with 20 mAe average macro pulse current. This results in an average beam power of 75 kW, and an average beam power within the macro pulse of 500 kW. The beam profile at the exit of the DTL is approximately gaussian with a diameter (FWHM) of about 3 mm. Designing diagnostics for this beam is challenging, as any diagnostics that intercept beam will receive a very high heat load. A BIFM (Beam Induced Fluorescence Monitor) is being developed to measure beam profiles. Nitrogen gas is leaked into the beamline. Excitation of the nitrogen by beam particles is captured using an image intensifier. The signal generated is directly proportional to the beam current. A prototype system has been constructed and tested on a lower intensity alpha beam. First results indicate we can measure beam profile to a 100 µm accuracy. Production system is currently being designed. The Nusano accelerator can also accelerate 2H⁺, 3He++, 6Li3+, 7Li3+, and a few other heavier ions.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP030
About •	Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 01 October 2023
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Paper

Title

Other Keywords

Page

MOP001

Current Status of the HESR Beam Instrumentation

pick-up, instrumentation, controls, antiproton

29

C. Böhme
FZJ, Jülich, Germany
A.J. Halama, V. Kamerdzhiev, G.K. Koch, K. Laihem, K. Reimers
GSI, Darmstadt, Germany

The High Energy Storage Ring (HESR), within the FAIR project, will according to current planning provide anti-proton beams for PANDA and heavy ion beams for i.a. the SPARC experiment. Manufacturing for most of the envisaged beam instrumentation devices in vacuum is completed and testing is well underway. The overall status update of the beam instrumentation devices is presented, with a focus on the test-bench results of the BPMs. In addition, the planned future timeline of the HESR beam instrumentation is briefly reported.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP001

About •

Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 18 September 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP018

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

detector, target, experiment, monitoring

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

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP032

One Dimensional Beam Position Monitor Prototype using Incoherent Cherenkov Diffraction Radiation

pick-up, radiation, electron, experiment

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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MOP039

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

detector, electron, electronics, timing

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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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP043

Using Lag Compensator in Orbit Feedback

feedback, power-supply, operation, simulation

123

I. Pinayev
BNL, Upton, New York, USA

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

Poster MOP043 [0.230 MB]

DOI •

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

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

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TU3I04

Comparison of Different Bunch Charge Monitors Used at the ARES Accelerator at DESY

electron, experiment, cavity, FEL

169

T. Lensch, D. Lipka, Re. Neumann, M. Werner
DESY, Hamburg, Germany

The SINBAD (Short and INnovative Bunches and Ac-celerators at DESY) facility, also called ARES (Acceler-ator Research Experiment at SINBAD), is a conventional S-band linear RF accelerator allowing the production of lowcharge ultra-short electron bunches within a range of currently 0.01 pC to 250 pC. The R&D accelerator also hosts various experiments. Especially for the medical eFLASH experiment an absolute, non-destructive charge measurement is needed. Therefore different types of monitors are installed along the 45 m long machine: A new Faraday Cup design had been simulated and realized. Further two resonant cavities (Dark Current monitors) and two beam charge transfomers (Toroids) are installed. Both, Dark Current Monitors and Toroids are calibrated independently with laboratory setups. At the end of the accelerator a Bergoz Turbo-ICT is installed. This paper will give an overview of the current installations of charge monitors at ARES and compare their measured linearity and resolution.

Slides TU3I04 [4.553 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU3I04

About •

Received ※ 01 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 29 September 2023

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TUP002

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

luminosity, feedback, detector, operation

179

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

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

Poster TUP002 [0.727 MB]

DOI •

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

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

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TUP011

Geometry Study of an RF-Window for a GHz Transition Radiation Monitor for Longitudinal Bunch Shape Measurements

radiation, simulation, target, FEL

209

S. Klaproth, A. Penirschke
THM, Friedberg, Germany
H. De Gersem
TEMF, TU Darmstadt, Darmstadt, Germany
R. Singh
GSI, Darmstadt, Germany

Funding: This work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05P21RORB2. Joint Project 05P2021 - R&D Accelerator (DIAGNOSE)
GHz transition radiation monitors (GTRs) can be used to measure longitudinal beam profiles even for low ß beams. In comparison to traditional methods e.g., Fast Faraday Cups (FFCs) and Feschenko monitors, GTRs are a non-destructive measurement method and are able to resolve bunch-by-bunch longitudinal profiles at the same time. In our case, we plan to measure the transition radiation outside the beam line through an RF-window with an 8 GHz broad band antenna. At the border of the RF-window the transition radiation is partially reflected propagating in the beam line backwards. In this contribution, we show a study of different geometries to suppress reflections generated at the transition to the RF-window. For higher permittivity the strength of these reflections becomes stronger, simultaneously reducing the measurable signal strength at the antenna. Secondly the RF-window material must be UHV usable and should be durable like Alumina or Peek.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP011

About •

Received ※ 25 September 2023 — Revised ※ 29 September 2023 — Accepted ※ 30 September 2023 — Issue date ※ 30 September 2023

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reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEP001

Non-invasive Profilers for the Cold Part of ESS Accelerator

proton, electron, space-charge, linac

326

J. Marroncle, P. Abbon, F. Belloni, F. Bénédetti, T. Hamelin, J.-Ph. Mols, L. Scola
CEA-DRF-IRFU, France
B. Bolzon, N. Chauvin, D. Chirpaz-Cerbat, M. Combet, M.J. Desmons, Y. Gauthier, C. Lahonde-Hamdoun, Ph. Legou, O. Leseigneur, Y. Mariette, V. Nadot, M. Oublaid, G. Perreu, F. Popieul, B. Pottin, Y. Sauce, J. Schwindling, F. Senée, O. Tuske, S. Tzvetkov
CEA-IRFU, Gif-sur-Yvette, France
I. Dolenc Kittelmann, A.A. Gevorgyan, H. Kocevar, R. Tarkeshian, C.A. Thomas
ESS, Lund, Sweden

Several Non-invasive Profile Monitors are being in-stalled along the accelerator to support the commissioning, tuning and operation of the powerful proton based ESS linear accelerator. In the low energy parts of the ESS linac (3.6 MeV to 90 MeV), the residual gas pressure is high enough to measure the transverse beam profile by using fluorescence induced by the beam on the gas molecules. However, in the ESS linac sections above 90 MeV, protons are accelerated by superconductive cavities working at cryogenic temperatures and high vacuum. Therefore, the signal based on the fluorescence process is too weak, while ionization can counteract this drawback. We have provided five IPM (Ionization Profile Monitors) pairs for energies ranging from 100 to 600 MeV. The design of such monitors is challenging due to weak signal (as a result of high proton energy and low pressure <10-9 mbar), tight space constraints inside the vacuum chamber, space charge effect, ISO-5 cleanliness requirement, and electrode polarization at ±15 kV. This publication will detail the development we followed to fulfil the ESS requirements.

Poster WEP001 [2.190 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP001

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Received ※ 03 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023

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WEP025

A Study of the Gain of Microchannel Plates in the Ionization Profile Monitors at Fermilab

electron, ECR, booster, instrumentation

405

R.M. Thurman-Keup, C.E. Lundberg, D. Slimmer, J.R. Zagel
Fermilab, Batavia, Illinois, USA

Funding: This work was produced by Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy.
One of the on-going issues with the use of microchannel plates (MCP) in the ionization profile monitors (IPM) at Fermilab is the significant decrease in gain over time. There are several possible issues that can cause this. Historically, the assumption has been that this is aging, where the secondary emission yield (SEY) of the pore surface changes after some amount of extracted charge. Recent literature searches have brought to light the possibility that this is an initial ’scrubbing’ effect whereby adsorbed gasses are removed from the MCP pores by the removal of charge from the MCP. This paper discusses the results of studies conducted on the IPMs in the Main Injector at Fermilab.

Poster WEP025 [7.408 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP025

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Received ※ 08 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 11 September 2023 — Issue date ※ 18 September 2023

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WEP027

Status of Gas Sheet Monitor for Profile Measurements at FRIB

photon, simulation, optics, heavy-ion

410

A. Lokey, S.M. Lidia
FRIB, East Lansing, Michigan, USA

Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661, the State of Michigan and Michigan State University.
We report on the status of work on a non-invasive profile monitor under development for use at the Facility for Rare Isotope Beams (FRIB), a heavy-ion LINAC which produces high-intensity, multi-charge state beams. The measurement will be made by collecting photons generated at the interaction point of the beam and a collimated molecular gas curtain. These photons will be collected with an intensified camera system, generating a two dimensional image and allowing for measurements of profile, beam halo, and other properties more prevalent at specific locations of interest, such as charge state spread after folding segment bends. Included will be ongoing design specifications, simulation results, and discussion of measurement techniques for acquiring signal from the device.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP027

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Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 14 September 2023

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WEP030

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

experiment, neutron, diagnostics, operation

418

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

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

DOI •

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

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

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