IBIC2023 - List of Keywords (target)

Paper	Title	Other Keywords	Page
MOP002	MiniBEE - Minibeam Beamline for Preclinical Experiments	proton, radiation, cyclotron, simulation	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
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, experiment, vacuum, 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)

MOP033	1L Target Harp Diagnostic Display Tool	operation, diagnostics, neutron, status	99
	A.D. Walker, E.L. Kerstiens LANL, Los Alamos, New Mexico, USA
	The Los Alamos Neutron Science Center (LANSCE) completed upgrades to its 1L Target Facility, which included installing the new Mark IV target assembly. This added a third tungsten target located upstream of the other two targets. Prior to Mark IV, beam centering on target was achieved by using thermocouples mounted to the quadrants and center of the upper target coolant chamber. It is slightly offset from center of the old upper target and it shadows several of the thermocouples previously used to center beam on target. This required adjustments to the diagnostic tools utilized to monitor position of the H⁻ beam that is being delivered to the 1L target. The original display included the thermocouple readouts and displayed a visual beam profile and position taken from an upstream harp. With some of the thermocouples now being shadowed, an image overlay was added to show where the harp¿s measured beam position is relative to both the upper and middle targets. This gives the beam operations team an additional level of awareness when it comes to thermocouple temperatures, beam steering, and beam tuning. Details of the display tool and its associated upgrades are presented. LANL Report #: LA-UR-23-25004
	Poster MOP033 [0.825 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP033
About •	Received ※ 05 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 20 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP038	Development of an Active Beam-Stabilization System for Electrofission Experiments at the S-Dalinac	electron, controls, linac, experiment	111
	D. Schneider, M. Arnold, U. Bonnes, A. Brauch, M. Dutine, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, G. Steinhilber TU Darmstadt, Darmstadt, Germany
	Funding: Work supported by DFG (GRK 2128), BMBF (05H21RDRB1), the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006) and the LOEWE Research Group Nuclear Photonics. The r-process fission cycle terminates the natural synthesis of heavy elements in binary neutron-star mergers. Fission processes of transuranium nuclides will be studied in electrofission reactions at the S-DALINAC. Due to the minuscule fissile target, the experimental setup requires an active electron-beam-stabilization system with high accuracy and a beam position resolution in the submillimeter range. In this contribution, requirements and concepts of this system regarding beam-diagnostic elements, feedback control and readout electronics are presented. The usage of a beam position monitor cavity and optical transition radiation targets to monitor the required beam parameters will be discussed in detail. Additionally, various measurements performed at the S-DALINAC to assess requirements and limits for the beam-stabilization system will be presented. Finally, the option of using advanced machine learning methods such as neural networks and agent-based reinforcement learning will be discussed. N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)
	Poster 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
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOP041	Modified Fast Orbit Feedback Controller for Disturbance Attenuation in Long Straights for Diamond-II	controls, simulation, electron, feedback	119
	S. Banerjee, M.G. Abbott, L. Bobb, I. Kempf DLS, Harwell, United Kingdom I. Kempf University of Oxford, Oxford, United Kingdom
	At Diamond Light Source, the fast orbit feedback (FOFB) uses one array of correctors and the controller is designed using the internal model control (IMC) structure. The Diamond-II upgrade will introduce an additional array of fast correctors and a new controller that is designed using the generalised modal decomposition, increasing the overall closed-loop bandwidth from 140 Hz to 1 kHz. Although simulation results have shown that the resulting beam displacement is within specification in all straights, they have also shown that the performance on long straights is limited, particularly in the vertical plane. In this paper, the controller is tuned in order to increase the FOFB performance in long straights by introducing a mode-by-mode regularisation parameter. The performance of the controller beyond 1 kHz is assessed using new disturbance data and a new measurement noise model, showing that the Diamond-II performance criteria are met, even in the presence of measurement noise.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP041
About •	Received ※ 07 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TU2I02	First Direct Measurement of Electron and Positron Bunch Characteristics during Positron Capture Process at the Positron Source of the SuperKEKB B-Factory	positron, operation, electron, factory	146
	T. Suwada KEK, Ibaraki, Japan
	Electron (e-) and positron (e+) bunch characteristics were directly measured for the first time using wideband beam monitors (WBMs) and a detection system at the e⁺ source of the SuperKEKB B-factory. Both secondarily-generated e^- and e⁺ bunches after the e±production target were clearly identified in their dynamical capture process at locations of the WBMs under two-bunch acceleration scheme. Not only the longitudinal but also transverse bunch characteristics, the time intervals between the e^- and e⁺ bunches, the bunch lengths, transverse bunch positions, and bunch charges were simultaneously separately measured for each bunch as functions of the capture phase to investigate their dynamical capture process. The results show that quite symmetric dynamical behaviors for the e^- and e⁺ bunch characteristics were clearly observed. The new WBMs open up a new window for direct measurements of both the e^- and e⁺ bunches during their dynamical capture process and in the optimization procedure of the e⁺ bunch intensity in multidimensional parameter spaces at any e⁺ sources. The historical backgrounds for introducing and implementing the new WBMs are also described in this report.
	Slides TU2I02 [2.925 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2I02
About •	Received ※ 07 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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TUP004	Detector Response Studies of the ESS Ionization Chamber	detector, linac, neutron, simulation	183
	I. Dolenc Kittelmann, V. Grishin ESS, Lund, Sweden P. Boutachkov GSI, Darmstadt, Germany E. Effinger, A.T. Lernevall, W. Viganò, C. Zamantzas CERN, Meyrin, Switzerland
	The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a pulsed neutron source based on a proton linac. The ESS linac is designed to deliver a 2GeV beam with peak current of 62.5mA at 14 Hz to a rotating tungsten target for neutron production. One of the most critical elements for protection of an accelerator is a Beam Loss Monitoring (BLM) system. The system is designed to protect the accelerator from beam-induced damage and unnecessary activation of the components. The main ESS BLM system is based on ionization chamber (IC) detectors. The detector was originally designed for the LHC at CERN resulting in production of 4250 monitors in 2006-2008. In 2014-2017 a new production of 830 detectors with a modified design was carried out to replenish spares for LHC and make a new series for ESS and GSI. This contribution focuses on the results from a measurement campaigns performed at the HRM (High-Radiation to Materials) facility at CERN, where detector response of the ESS type IC has been studied. The results may be of interest for other facilities, that are using existing or plan to use new generation of LHC type IC monitors as BLM detectors.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP004
About •	Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 16 September 2023 — Issue date ※ 21 September 2023
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TUP011	Geometry Study of an RF-Window for a GHz Transition Radiation Monitor for Longitudinal Bunch Shape Measurements	radiation, vacuum, simulation, 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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TUP023	Application of a Camera Array for the Upgrade of the AWAKE Spectrometer	electron, proton, plasma, emittance	230
	E. Senes, S. Mazzoni, M. Turner, G. Zevi Della Porta CERN, Meyrin, Switzerland D.A. Cooke, F.E. Pannell, M. Wing UCL, London, United Kingdom
	The first run of the AWAKE experiment successfully demonstrated the acceleration of an electron beam in the plasma wakefields of a relativistic proton beam. The planned second run will focus on the control of the emittance of accelerated electrons, requiring an upgrade of the existing spectrometer. Preliminary measurements showed that this might be achieved by improving the resolution of the scintillator and with a new design of the optical system. This contribution discusses the application of a digital camera array in close proximity of the spectrometer scintillator, to enable the accelerated electron beam emittance measurement.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP023
About •	Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 24 September 2023
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WEP006	Development of Pepper-pot Emittance Monitor for High-intensity Ion Beam Accelerated by RIKEN AVF Cyclotron	emittance, cyclotron, radiation, beam-transport	339
	Y. Kotaka, N. Imai, K. Kamakura, Y. Sakemi, H. Yamaguchi CNS, Saitama, Japan K. Hatanaka RCNP, Osaka, Japan J. Ohnishi RIKEN Nishina Center, Wako, Japan
	At the Center for Nuclear Study of the University of Tokyo, the measurement of Electric Dipole Moment of Francium (Fr) is underway with the world highest precision. Fr is generated by nuclear fusion reaction by irradiating gold with oxygen ion beam accelerated by RIKEN AVF Cyclotron. The required beam intensity is 18 eµA or more. However, the average beam transport efficiency drops to be around 66 % as the beam intensity exceeds 10 eµA. To solve the problem, a pepper-pot emittance monitor (PEM) for high-intensity beams has been developed. Referencing the PEM used for the injection beams of AVF Cyclotron, we have developed three additional items. The first is reducing the radiation damage to a camera, which is placed away from the beamline. The distance between the camera and PEM is 2.2 m, and the average image position accuracy of 0.15 mm is achieved. The second is the angular accuracy suitable for the accelerated beam. The required angular accuracy is estimated to be less than 0.3 mrad. A beam test for the first and second items is planned. The third is a beam shutter system to prevent PEM from heating due to beam. The measurement time by the system reaches 0.27 seconds now.
	Poster WEP006 [2.250 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP006
About •	Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023
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WEP007	Beam Profile Measurement using Helium Gas Light Emission and BEPM for Superheavy Element Search Experiment	controls, experiment, optics, quadrupole	343
	T. Watanabe, O. Kamigaito, T. Nishi, A. Uchiyama RIKEN Nishina Center, Wako, Japan T. Adachi, B. Brionnet, K.M. Morimoto RIKEN, Saitama, Japan A. Kamoshida National Instruments Japan Corporation, MInato-ku, Tokyo, Japan K. Kaneko, R. Koyama SHI Accelerator Service Ltd., Tokyo, Japan
	The newly constructed superconducting linear accelerator (SRILAC) is now in operation with the aim of discovering new superheavy elements and advancing the production of medical radiation isotopes. Because it is crucial to extend the durability of the expensive Cm target for as long as possible, these experiments require the accelerated V beam to be sufficiently widened. To this end, a helium gas light emission monitor (HeLM) has been introduced to measure the beam profile. Because He gas flows within the target chamber, by capturing the light emitted from He gas with a CCD camera, the beam profile can be obtained nondestructively and continuously. These measurements are handled through programming in LabVIEW, with analyzed data integrated into an EPICS control system. A method to estimate the beam envelope has been recently developed by leveraging the measured quadrupole moments with beam energy position monitors (BEPMs), and incorporating calculations of the transfer matrix. The synergistic use of HeLM and BEPM plays a useful role in accurately controlling the beam size at the Cm target.
	Poster WEP007 [4.168 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP007
About •	Received ※ 04 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023
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WEP022	Target Multiwire for the Fermilab Booster Neutrino Beamline	electron, radiation, electronics, proton	392
	R.M. Prokop Fermilab, Batavia, Illinois, USA
	Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359. The Booster Neutrino Beamline experiment requested a new secondary electron emission multiwire profile monitor installation. The device had to be durable in high radiation conditions and mounted within a large 10 foot airtight steel fixture for installation near the beam target. Previous iterations of multiwire suffered radiation damage to both the connectors and wires. To ensure accurate horizontal and vertical beam profile measurements, an updated design was proposed, designed, and constructed. The new BNB multiwire utilizes 3 mil diameter gold-plated tungsten sense wires soldered to vertical and horizontal Alumina-96 ceramic planes, 50 wires per plane. Radiation hard Kapton insulated 30 gauge wires carry the output signals. Profiles are readout through charge integrator scanner electronics. This paper will detail the design and functionality of the BNB target multiwire and present relevant beam profile data.
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP022
About •	Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023
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WEP023	Progress on an Electron Beam Profile Monitor at the Fermilab Main Injector	electron, proton, gun, experiment	395
	R.M. Thurman-Keup, T.V. Folan, M.W. Mwaniki, S.G. Sas-Pawlik 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. The current program at Fermilab involves the construction of a new superconducting linear accelerator (LINAC) to replace the existing warm version. The new LINAC, together with other planned improvements, is in support of proton beam intensities in the Main Injector (MI) that will exceed 2 MW. Measuring the transverse profiles of these high intensity beams in a ring requires non-invasive techniques. The MI uses ionization profile monitors as its only profile system. An alternative technique involves measuring the deflection of a probe beam of electrons with a trajectory perpendicular to the proton beam. This type of device was installed in MI and initial studies of it have been previously presented. This paper will present the status and recent studies of the device utilizing different techniques.
	Poster WEP023 [3.243 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP023
About •	Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 14 September 2023
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Paper

Title

Other Keywords

Page

MOP002

MiniBEE - Minibeam Beamline for Preclinical Experiments

proton, radiation, cyclotron, simulation

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

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, experiment, vacuum, 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

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

MOP033

1L Target Harp Diagnostic Display Tool

operation, diagnostics, neutron, status

99

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

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

Poster MOP033 [0.825 MB]

DOI •

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

About •

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

Cite •

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

MOP038

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

electron, controls, linac, experiment

111

D. Schneider, M. Arnold, U. Bonnes, A. Brauch, M. Dutine, R. Grewe, L.E. Jürgensen, N. Pietralla, F. Schließmann, G. Steinhilber
TU Darmstadt, Darmstadt, Germany

Funding: Work supported by DFG (GRK 2128), BMBF (05H21RDRB1), the State of Hesse within the Research Cluster ELEMENTS (Project ID 500/10.006) and the LOEWE Research Group Nuclear Photonics.
The r-process fission cycle terminates the natural synthesis of heavy elements in binary neutron-star mergers. Fission processes of transuranium nuclides will be studied in electrofission reactions at the S-DALINAC*. Due to the minuscule fissile target, the experimental setup requires an active electron-beam-stabilization system with high accuracy and a beam position resolution in the submillimeter range. In this contribution, requirements and concepts of this system regarding beam-diagnostic elements, feedback control and readout electronics are presented. The usage of a beam position monitor cavity and optical transition radiation targets to monitor the required beam parameters will be discussed in detail. Additionally, various measurements performed at the S-DALINAC to assess requirements and limits for the beam-stabilization system will be presented. Finally, the option of using advanced machine learning methods such as neural networks and agent-based reinforcement learning will be discussed.
*N. Pietralla, Nuclear Physics News, Vol. 28, No. 2, 4 (2018)

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

MOP041

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

controls, simulation, electron, feedback

119

S. Banerjee, M.G. Abbott, L. Bobb, I. Kempf
DLS, Harwell, United Kingdom
I. Kempf
University of Oxford, Oxford, United Kingdom

At Diamond Light Source, the fast orbit feedback (FOFB) uses one array of correctors and the controller is designed using the internal model control (IMC) structure. The Diamond-II upgrade will introduce an additional array of fast correctors and a new controller that is designed using the generalised modal decomposition, increasing the overall closed-loop bandwidth from 140 Hz to 1 kHz. Although simulation results have shown that the resulting beam displacement is within specification in all straights, they have also shown that the performance on long straights is limited, particularly in the vertical plane. In this paper, the controller is tuned in order to increase the FOFB performance in long straights by introducing a mode-by-mode regularisation parameter. The performance of the controller beyond 1 kHz is assessed using new disturbance data and a new measurement noise model, showing that the Diamond-II performance criteria are met, even in the presence of measurement noise.

DOI •

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

About •

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

Cite •

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

TU2I02

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

positron, operation, electron, factory

146

T. Suwada
KEK, Ibaraki, Japan

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

Slides TU2I02 [2.925 MB]

DOI •

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

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

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TUP004

Detector Response Studies of the ESS Ionization Chamber

detector, linac, neutron, simulation

183

I. Dolenc Kittelmann, V. Grishin
ESS, Lund, Sweden
P. Boutachkov
GSI, Darmstadt, Germany
E. Effinger, A.T. Lernevall, W. Viganò, C. Zamantzas
CERN, Meyrin, Switzerland

The European Spallation Source (ESS), currently under construction in Lund, Sweden, will be a pulsed neutron source based on a proton linac. The ESS linac is designed to deliver a 2GeV beam with peak current of 62.5mA at 14 Hz to a rotating tungsten target for neutron production. One of the most critical elements for protection of an accelerator is a Beam Loss Monitoring (BLM) system. The system is designed to protect the accelerator from beam-induced damage and unnecessary activation of the components. The main ESS BLM system is based on ionization chamber (IC) detectors. The detector was originally designed for the LHC at CERN resulting in production of 4250 monitors in 2006-2008. In 2014-2017 a new production of 830 detectors with a modified design was carried out to replenish spares for LHC and make a new series for ESS and GSI. This contribution focuses on the results from a measurement campaigns performed at the HRM (High-Radiation to Materials) facility at CERN, where detector response of the ESS type IC has been studied. The results may be of interest for other facilities, that are using existing or plan to use new generation of LHC type IC monitors as BLM detectors.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP004

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Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 16 September 2023 — Issue date ※ 21 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, vacuum, simulation, 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

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

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TUP023

Application of a Camera Array for the Upgrade of the AWAKE Spectrometer

electron, proton, plasma, emittance

230

E. Senes, S. Mazzoni, M. Turner, G. Zevi Della Porta
CERN, Meyrin, Switzerland
D.A. Cooke, F.E. Pannell, M. Wing
UCL, London, United Kingdom

The first run of the AWAKE experiment successfully demonstrated the acceleration of an electron beam in the plasma wakefields of a relativistic proton beam. The planned second run will focus on the control of the emittance of accelerated electrons, requiring an upgrade of the existing spectrometer. Preliminary measurements showed that this might be achieved by improving the resolution of the scintillator and with a new design of the optical system. This contribution discusses the application of a digital camera array in close proximity of the spectrometer scintillator, to enable the accelerated electron beam emittance measurement.

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TUP023

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Received ※ 05 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 24 September 2023

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WEP006

Development of Pepper-pot Emittance Monitor for High-intensity Ion Beam Accelerated by RIKEN AVF Cyclotron

emittance, cyclotron, radiation, beam-transport

339

Y. Kotaka, N. Imai, K. Kamakura, Y. Sakemi, H. Yamaguchi
CNS, Saitama, Japan
K. Hatanaka
RCNP, Osaka, Japan
J. Ohnishi
RIKEN Nishina Center, Wako, Japan

At the Center for Nuclear Study of the University of Tokyo, the measurement of Electric Dipole Moment of Francium (Fr) is underway with the world highest precision. Fr is generated by nuclear fusion reaction by irradiating gold with oxygen ion beam accelerated by RIKEN AVF Cyclotron. The required beam intensity is 18 eµA or more. However, the average beam transport efficiency drops to be around 66 % as the beam intensity exceeds 10 eµA. To solve the problem, a pepper-pot emittance monitor (PEM) for high-intensity beams has been developed. Referencing the PEM used for the injection beams of AVF Cyclotron, we have developed three additional items. The first is reducing the radiation damage to a camera, which is placed away from the beamline. The distance between the camera and PEM is 2.2 m, and the average image position accuracy of 0.15 mm is achieved. The second is the angular accuracy suitable for the accelerated beam. The required angular accuracy is estimated to be less than 0.3 mrad. A beam test for the first and second items is planned. The third is a beam shutter system to prevent PEM from heating due to beam. The measurement time by the system reaches 0.27 seconds now.

Poster WEP006 [2.250 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP006

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Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023

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WEP007

Beam Profile Measurement using Helium Gas Light Emission and BEPM for Superheavy Element Search Experiment

controls, experiment, optics, quadrupole

343

T. Watanabe, O. Kamigaito, T. Nishi, A. Uchiyama
RIKEN Nishina Center, Wako, Japan
T. Adachi, B. Brionnet, K.M. Morimoto
RIKEN, Saitama, Japan
A. Kamoshida
National Instruments Japan Corporation, MInato-ku, Tokyo, Japan
K. Kaneko, R. Koyama
SHI Accelerator Service Ltd., Tokyo, Japan

The newly constructed superconducting linear accelerator (SRILAC) is now in operation with the aim of discovering new superheavy elements and advancing the production of medical radiation isotopes. Because it is crucial to extend the durability of the expensive Cm target for as long as possible, these experiments require the accelerated V beam to be sufficiently widened. To this end, a helium gas light emission monitor (HeLM) has been introduced to measure the beam profile. Because He gas flows within the target chamber, by capturing the light emitted from He gas with a CCD camera, the beam profile can be obtained nondestructively and continuously. These measurements are handled through programming in LabVIEW, with analyzed data integrated into an EPICS control system. A method to estimate the beam envelope has been recently developed by leveraging the measured quadrupole moments with beam energy position monitors (BEPMs), and incorporating calculations of the transfer matrix. The synergistic use of HeLM and BEPM plays a useful role in accurately controlling the beam size at the Cm target.

Poster WEP007 [4.168 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP007

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Received ※ 04 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 22 September 2023

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WEP022

Target Multiwire for the Fermilab Booster Neutrino Beamline

electron, radiation, electronics, proton

392

R.M. Prokop
Fermilab, Batavia, Illinois, USA

Funding: This work was supported by the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
The Booster Neutrino Beamline experiment requested a new secondary electron emission multiwire profile monitor installation. The device had to be durable in high radiation conditions and mounted within a large 10 foot airtight steel fixture for installation near the beam target. Previous iterations of multiwire suffered radiation damage to both the connectors and wires. To ensure accurate horizontal and vertical beam profile measurements, an updated design was proposed, designed, and constructed. The new BNB multiwire utilizes 3 mil diameter gold-plated tungsten sense wires soldered to vertical and horizontal Alumina-96 ceramic planes, 50 wires per plane. Radiation hard Kapton insulated 30 gauge wires carry the output signals. Profiles are readout through charge integrator scanner electronics. This paper will detail the design and functionality of the BNB target multiwire and present relevant beam profile data.

DOI •

reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP022

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Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 16 September 2023

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WEP023

Progress on an Electron Beam Profile Monitor at the Fermilab Main Injector

electron, proton, gun, experiment

395

R.M. Thurman-Keup, T.V. Folan, M.W. Mwaniki, S.G. Sas-Pawlik
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.
The current program at Fermilab involves the construction of a new superconducting linear accelerator (LINAC) to replace the existing warm version. The new LINAC, together with other planned improvements, is in support of proton beam intensities in the Main Injector (MI) that will exceed 2 MW. Measuring the transverse profiles of these high intensity beams in a ring requires non-invasive techniques. The MI uses ionization profile monitors as its only profile system. An alternative technique involves measuring the deflection of a probe beam of electrons with a trajectory perpendicular to the proton beam. This type of device was installed in MI and initial studies of it have been previously presented. This paper will present the status and recent studies of the device utilizing different techniques.

Poster WEP023 [3.243 MB]

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reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP023

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Received ※ 08 September 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 14 September 2023

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