IBIC2018 - Table of Session: MOPA (Monday Poster A)

Paper	Title	Page
MOPA01	Status Overview of the HESR Beam Instrumentation	26
	C. Böhme, A.J. Halama, V. Kamerdzhiev, F. Klehr, B. Klimczok, M. Maubach, S. Merzliakov, D. Prasuhn, R. Tölle FZJ, Jülich, Germany
	The High Energy Storage Ring (HESR), within the Facility for Antiproton and Ion Research (FAIR), will provide proton and anti-proton beams for PANDA (Proton Antiproton Annihilation at Darmstadt) and heavy ion beams for SPARC (Stored Particles Atomic Physics Research Collaboration). With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM being in production, other BI instruments like Viewer, Scraper, or Ionization Beam Profile Monitor are in the mechanical design phase. An overview of the status is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA01
About •	paper received ※ 12 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA02	Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation	29
	H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama KEK, Ibaraki, Japan
	The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02
About •	paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA04	The Beam Instruments for HIMM@IMP	33
	T.C. Zhao, Y.C. Chen, J.M. Dong, Y.C. Feng, X.C. Kang, M. Li, S. Li, W.L. Li, W.N. Ma, R.S. Mao, H.H. Song, K. Song, Y. Wang, K. Wei, Z.G. Xu, Y. Yan, Y. Yin, Z.L. Zhao IMP/CAS, Lanzhou, People’s Republic of China
	HIMM（Heavy Ion Medical Machine）is a synchrotron based accelerator for cancer therapy in Wuwei city, China. It is composed of 2 ion sources, LEBT, cyclotron, MEBT, a synchrotron, HEBT and therapy terminals. The commissioning of HIMM is completed .At present, electrical safety, electromagnetic compatibility and performance testing of medical devices have been passed, and now enters the clinical tests phase. The beam diagnositics(BD) devices for HIMM are designed and produced by IMP BD department .An overview of the integrated devices is presented, and the common beam parameters in the different parts of the accelerator facility are reviewed including intensity measurement, beam profile, emmitance, energy and so on with the related detectors such as the View Screen, Faraday Cup, Radial Detector, Multi-wires, Phase Probe, Wire Scanner, DCCT, ICT, BPM, Schottky, Slit, Beam Stopper, Beam Halo Monitor, Multi-channel Ionization Chamber. Additionally, the RF-KO for beam extraction, the strip foil with automatic control system as well as the detectors for terminal therapy are described.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA04
About •	paper received ※ 05 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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MOPA06	Recent Advances in Beam Monitoring During SEE Testing on ISDE&JINR Heavy Ion Facilities	36
	P.A. Chubunov ISDE, Moscow, Russia V.S. Anashin United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia A. Issatov JINR/FLNR, Moscow region, Russia S.V. Mitrofanov JINR, Dubna, Moscow Region, Russia
	SEE testing of candidate electronic components for space applications is essential part of a spacecraft radiation hardness assurance process in terms of its operability in the harsh space radiation environment. The unique in Russia SEE test facilities have been created to provide SEE testing. The existing ion beam monitoring system has been presented at IBIC 2017, however, it has a number of shortcomings related to the lack of reliable online ion fluence measurement on the DUT, and inability to measure energies of the high-energy (15-60 MeV/nucleon) long-range (10-2000 µm) ions on the DUT. The paper presents the latest developments and their test results of the ISDE and JINR collaboration in the field of flux online monitoring (including, on the DUT) during tests using scintillation detectors based on flexible optical fibers, and measuring ion energies by the method of total absorption in the volume of scintillation or semiconductor detector. The modernization of the standard beam monitoring procedure during tests is proposed.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA06
About •	paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPA07	Beam Diagnostics and Instrumentation for Proton Irradiation Facility at INR RAS Linac	40
	S.A. Gavrilov, A.A. Melnikov, A.I. Titov RAS/INR, Moscow, Russia
	The new proton irradiation facility to study radiation effects in electronics and other materials has been built in INR RAS linac. The range of the specified intensity from 10⁷ to 10¹² protons per beam pulse is covered with three beam diagnostic instruments: current transformer, phosphor screen and multianode gas counter. The peculiarities of the joint use of the three instruments are described. The experimental results of beam parameters observations and adjustments are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA07
About •	paper received ※ 04 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA09	Overview of Beam Instrumentation and Commissioning Results from the Coherent Electron Cooling Experiment at BNL	43
	T.A. Miller, J.C.B. Brutus, W.C. Dawson, D.M. Gassner, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, D. Kayran, V. Litvinenko, C. Liu, R.J. Michnoff, M.G. Minty, P. Oddo, M.C. Paniccia, I. Pinayev, Z. Sorrell, J.E. Tuozzolo BNL, Upton, Long Island, New York, USA V. Litvinenko Stony Brook University, Stony Brook, USA
	Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy The Coherent Electron Cooling (CeC) Proof-of-Principle experiment [1], installed in the RHIC tunnel at BNL, has completed its second run. In this experiment, an FEL is used to amplify patterns imprinted on the cooling electron beam by the RHIC ion bunches and then the imprinted pattern is fed back to the ions to achieve cooling of the ion beam. Diagnostics for the CeC experiment have been fully commissioned during this year’s run. An overview of the beam instrumentation is presented, this includes devices for measurements of beam current, position, profile, bunch charge, emittance, as well as gun photocathode imaging and FEL infra-red light emission diagnostics. Design details are discussed and beam measurement results are presented. [1] I. Pinayev, et al, ’First Results of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL’ proceedings from IPAC 2018, Vancouver, CANADA
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA09
About •	paper received ※ 04 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPA12	The Design and Use of Faraday Cage in Linac Temporary Line of CSNS	48
	M. Meng DNSC, Dongguan, People’s Republic of China F. Li, P. Li, A.X. Wang, T.G. Xu IHEP, Beijing, People’s Republic of China J.L. Sun IHEP CSNS, Guangdong Province, People’s Republic of China
	In the end of linac temporary line in csns, we need a faraday cage to absorb the beam. in the beam experiment it will be mounted and used twice. according to the beam energy and current of csns, we choose water-cooled pipe structure with tilted panel after simulation. the main principle of the faraday cage design is to simplify the structure and reduce the radiation activation of it, to do this, we also do the simulation of radiation. to make sure the faraday cage is safe in beam experiment, we alos plug in a pt100 Platinum resistance to monitor the temperature. after faraday cage is built and mounted on the line, it works well and sustain the beam bombardment.
	Poster MOPA12 [0.471 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA12
About •	paper received ※ 03 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019
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MOPA13	Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project)	51
	C.G. Pang, P. Bambade, S. Di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault LAL, Orsay, France Y. Funakoshi, S. Uehara KEK, Ibaraki, Japan
	LumiBelle2 is a fast luminosity monitoring system prepared for SuperKEKB. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing scattering angle. Two types of online luminosity signals are provided, a Train-Integrated-Luminosity at 1 kHz as input to the dithering feedback system used to maintain optimum overlap between the colliding beams in horizontal plane, and Bunch-Integrated-Luminosities at about 1 Hz to check for variations along the bunch trains. Individual beam sizes and offsets can also be determined from collision scanning. This paper will describe the design of LumiBelle2 and report on its performance during the Phase-2 commissioning of SuperKEKB.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA13
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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MOPA14	Electron Spectrometer for a Low Charge Intermediate Energy LWFA Electron Beam Measurement	57
	A.V. Ottmar, Yu.I. Maltseva, T.V. Rybitskaya BINP SB RAS, Novosibirsk, Russia V. Gubin Institute of Laser Physics, SB RAS, Novosibirsk, Russia
	The Laser-driven Compton light source is under development in ILP SB RAS in collaboration with BINP SB RAS. Electron spectrometer for measurement of LWFA electron beam with energy in the range 10-150 MeV and bunch charge 1-10 pC is presented. Spectrometer based on permanent magnet and luminous screen with CCD registrar and this geometry was optimized for best measurements resolution in compromise with size limitations. Preliminary collimation of electron beam allows achieving energy resolution up to 5-10 % of top limit. System has been tested at the VEPP-5 linear electron accelerator and obtained results correspond to design objectives. Sensitivity of beam transverse charge density was experimentally fixed at 0.03 pC/mm², it is practically sufficient for our LWFA experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA14
About •	paper received ※ 03 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019
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MOPA16	Design of a Compact Permanent Magnet Spectrometer for CILEX/APOLLON	61
	M. Khojoyan, A. Cauchois, J. Prudent, A. Specka LLR, Palaiseau, France
	Laser wakefield acceleration experiments make extensive use of small permanent magnets or magnet assemblies for analyzing and focusing electron beams produced in plasma accelerators. This choice is motivated by the ease of operation inside vacuum chambers, absence of power-supplies and feedthroughs, and potentially lower cost. Indeed, in these experiments space is at premium, and compactness is frequently required. At the same time, these magnets have to have a large angular acceptance for the divergent laser and electron beams which imposes constraint of the gap size. We will present the optimized design and characterization of a 100 mm long, 2.1 Tesla permanent magnet dipole. Furthermore, we will present the implementation of this magnet in a spectrometer that will measure the energy spectrum of electrons of [60-2000] MeV with a few percent resolution in the CILEX/APOLLON 10PW laser facility in France.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA16
About •	paper received ※ 03 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019
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MOPA17	Momentum Compaction Measurement Using Synchrotron Radiation	66
	L. Torino, N. Carmignani, A. Franchi ESRF, Grenoble, France
	The momentum compaction factor of a storage ring can be obtained by measuring how the beam energy changes with the RF frequency. Direct measurement of the beam energy can be difficult, long or even not possible with acceptable accuracy and precision in some machines such as ESRF. Since the energy spectrum of the Synchrotron Radiation (SR) depends on the beam energy, it is indeed possible to relate the variation of the beam energy with a variation of the produced SR flux. In this proceeding, we will present how we obtain a measurement of the momentum compaction using this dependence.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA17
About •	paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019
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Paper

Title

Page

Status Overview of the HESR Beam Instrumentation

26

C. Böhme, A.J. Halama, V. Kamerdzhiev, F. Klehr, B. Klimczok, M. Maubach, S. Merzliakov, D. Prasuhn, R. Tölle
FZJ, Jülich, Germany

The High Energy Storage Ring (HESR), within the Facility for Antiproton and Ion Research (FAIR), will provide proton and anti-proton beams for PANDA (Proton Antiproton Annihilation at Darmstadt) and heavy ion beams for SPARC (Stored Particles Atomic Physics Research Collaboration). With the beam instrumentation devices envisaged in larger quantities, e.g. BPM and BLM being in production, other BI instruments like Viewer, Scraper, or Ionization Beam Profile Monitor are in the mechanical design phase. An overview of the status is presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA01

About •

paper received ※ 12 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPA02

Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation

29

H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan

The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02

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paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPA04

The Beam Instruments for HIMM@IMP

33

T.C. Zhao, Y.C. Chen, J.M. Dong, Y.C. Feng, X.C. Kang, M. Li, S. Li, W.L. Li, W.N. Ma, R.S. Mao, H.H. Song, K. Song, Y. Wang, K. Wei, Z.G. Xu, Y. Yan, Y. Yin, Z.L. Zhao
IMP/CAS, Lanzhou, People’s Republic of China

HIMM（Heavy Ion Medical Machine）is a synchrotron based accelerator for cancer therapy in Wuwei city, China. It is composed of 2 ion sources, LEBT, cyclotron, MEBT, a synchrotron, HEBT and therapy terminals. The commissioning of HIMM is completed .At present, electrical safety, electromagnetic compatibility and performance testing of medical devices have been passed, and now enters the clinical tests phase. The beam diagnositics(BD) devices for HIMM are designed and produced by IMP BD department .An overview of the integrated devices is presented, and the common beam parameters in the different parts of the accelerator facility are reviewed including intensity measurement, beam profile, emmitance, energy and so on with the related detectors such as the View Screen, Faraday Cup, Radial Detector, Multi-wires, Phase Probe, Wire Scanner, DCCT, ICT, BPM, Schottky, Slit, Beam Stopper, Beam Halo Monitor, Multi-channel Ionization Chamber. Additionally, the RF-KO for beam extraction, the strip foil with automatic control system as well as the detectors for terminal therapy are described.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA04

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paper received ※ 05 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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MOPA06

Recent Advances in Beam Monitoring During SEE Testing on ISDE&JINR Heavy Ion Facilities

36

P.A. Chubunov
ISDE, Moscow, Russia
V.S. Anashin
United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia
A. Issatov
JINR/FLNR, Moscow region, Russia
S.V. Mitrofanov
JINR, Dubna, Moscow Region, Russia

SEE testing of candidate electronic components for space applications is essential part of a spacecraft radiation hardness assurance process in terms of its operability in the harsh space radiation environment. The unique in Russia SEE test facilities have been created to provide SEE testing. The existing ion beam monitoring system has been presented at IBIC 2017, however, it has a number of shortcomings related to the lack of reliable online ion fluence measurement on the DUT, and inability to measure energies of the high-energy (15-60 MeV/nucleon) long-range (10-2000 µm) ions on the DUT. The paper presents the latest developments and their test results of the ISDE and JINR collaboration in the field of flux online monitoring (including, on the DUT) during tests using scintillation detectors based on flexible optical fibers, and measuring ion energies by the method of total absorption in the volume of scintillation or semiconductor detector. The modernization of the standard beam monitoring procedure during tests is proposed.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA06

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paper received ※ 06 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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MOPA07

Beam Diagnostics and Instrumentation for Proton Irradiation Facility at INR RAS Linac

40

S.A. Gavrilov, A.A. Melnikov, A.I. Titov
RAS/INR, Moscow, Russia

The new proton irradiation facility to study radiation effects in electronics and other materials has been built in INR RAS linac. The range of the specified intensity from 10⁷ to 10¹² protons per beam pulse is covered with three beam diagnostic instruments: current transformer, phosphor screen and multianode gas counter. The peculiarities of the joint use of the three instruments are described. The experimental results of beam parameters observations and adjustments are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA07

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paper received ※ 04 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPA09

Overview of Beam Instrumentation and Commissioning Results from the Coherent Electron Cooling Experiment at BNL

43

T.A. Miller, J.C.B. Brutus, W.C. Dawson, D.M. Gassner, R.L. Hulsart, P. Inacker, J.P. Jamilkowski, D. Kayran, V. Litvinenko, C. Liu, R.J. Michnoff, M.G. Minty, P. Oddo, M.C. Paniccia, I. Pinayev, Z. Sorrell, J.E. Tuozzolo
BNL, Upton, Long Island, New York, USA
V. Litvinenko
Stony Brook University, Stony Brook, USA

Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
The Coherent Electron Cooling (CeC) Proof-of-Principle experiment [1], installed in the RHIC tunnel at BNL, has completed its second run. In this experiment, an FEL is used to amplify patterns imprinted on the cooling electron beam by the RHIC ion bunches and then the imprinted pattern is fed back to the ions to achieve cooling of the ion beam. Diagnostics for the CeC experiment have been fully commissioned during this year’s run. An overview of the beam instrumentation is presented, this includes devices for measurements of beam current, position, profile, bunch charge, emittance, as well as gun photocathode imaging and FEL infra-red light emission diagnostics. Design details are discussed and beam measurement results are presented.
[1] I. Pinayev, et al, ’First Results of Proof-of-Principle Experiment of Coherent Electron Cooling at BNL’ proceedings from IPAC 2018, Vancouver, CANADA

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA09

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paper received ※ 04 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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MOPA12

The Design and Use of Faraday Cage in Linac Temporary Line of CSNS

48

M. Meng
DNSC, Dongguan, People’s Republic of China
F. Li, P. Li, A.X. Wang, T.G. Xu
IHEP, Beijing, People’s Republic of China
J.L. Sun
IHEP CSNS, Guangdong Province, People’s Republic of China

In the end of linac temporary line in csns, we need a faraday cage to absorb the beam. in the beam experiment it will be mounted and used twice. according to the beam energy and current of csns, we choose water-cooled pipe structure with tilted panel after simulation. the main principle of the faraday cage design is to simplify the structure and reduce the radiation activation of it, to do this, we also do the simulation of radiation. to make sure the faraday cage is safe in beam experiment, we alos plug in a pt100 Platinum resistance to monitor the temperature. after faraday cage is built and mounted on the line, it works well and sustain the beam bombardment.

Poster MOPA12 [0.471 MB]

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA12

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paper received ※ 03 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019

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MOPA13

Fast Luminosity Monitoring for the SuperKEKB Collider (LumiBelle2 Project)

51

C.G. Pang, P. Bambade, S. Di Carlo, D. Jehanno, V. Kubytskyi, Y. Peinaud, C. Rimbault
LAL, Orsay, France
Y. Funakoshi, S. Uehara
KEK, Ibaraki, Japan

LumiBelle2 is a fast luminosity monitoring system prepared for SuperKEKB. It uses sCVD diamond detectors placed in both the electron and positron rings to measure the Bhabha scattering process at vanishing scattering angle. Two types of online luminosity signals are provided, a Train-Integrated-Luminosity at 1 kHz as input to the dithering feedback system used to maintain optimum overlap between the colliding beams in horizontal plane, and Bunch-Integrated-Luminosities at about 1 Hz to check for variations along the bunch trains. Individual beam sizes and offsets can also be determined from collision scanning. This paper will describe the design of LumiBelle2 and report on its performance during the Phase-2 commissioning of SuperKEKB.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA13

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paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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MOPA14

Electron Spectrometer for a Low Charge Intermediate Energy LWFA Electron Beam Measurement

57

A.V. Ottmar, Yu.I. Maltseva, T.V. Rybitskaya
BINP SB RAS, Novosibirsk, Russia
V. Gubin
Institute of Laser Physics, SB RAS, Novosibirsk, Russia

The Laser-driven Compton light source is under development in ILP SB RAS in collaboration with BINP SB RAS. Electron spectrometer for measurement of LWFA electron beam with energy in the range 10-150 MeV and bunch charge 1-10 pC is presented. Spectrometer based on permanent magnet and luminous screen with CCD registrar and this geometry was optimized for best measurements resolution in compromise with size limitations. Preliminary collimation of electron beam allows achieving energy resolution up to 5-10 % of top limit. System has been tested at the VEPP-5 linear electron accelerator and obtained results correspond to design objectives. Sensitivity of beam transverse charge density was experimentally fixed at 0.03 pC/mm², it is practically sufficient for our LWFA experiments.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA14

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paper received ※ 03 September 2018 paper accepted ※ 13 September 2018 issue date ※ 29 January 2019

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MOPA16

Design of a Compact Permanent Magnet Spectrometer for CILEX/APOLLON

61

M. Khojoyan, A. Cauchois, J. Prudent, A. Specka
LLR, Palaiseau, France

Laser wakefield acceleration experiments make extensive use of small permanent magnets or magnet assemblies for analyzing and focusing electron beams produced in plasma accelerators. This choice is motivated by the ease of operation inside vacuum chambers, absence of power-supplies and feedthroughs, and potentially lower cost. Indeed, in these experiments space is at premium, and compactness is frequently required. At the same time, these magnets have to have a large angular acceptance for the divergent laser and electron beams which imposes constraint of the gap size. We will present the optimized design and characterization of a 100 mm long, 2.1 Tesla permanent magnet dipole. Furthermore, we will present the implementation of this magnet in a spectrometer that will measure the energy spectrum of electrons of [60-2000] MeV with a few percent resolution in the CILEX/APOLLON 10PW laser facility in France.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA16

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paper received ※ 03 September 2018 paper accepted ※ 12 September 2018 issue date ※ 29 January 2019

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MOPA17

Momentum Compaction Measurement Using Synchrotron Radiation

66

L. Torino, N. Carmignani, A. Franchi
ESRF, Grenoble, France

The momentum compaction factor of a storage ring can be obtained by measuring how the beam energy changes with the RF frequency. Direct measurement of the beam energy can be difficult, long or even not possible with acceptable accuracy and precision in some machines such as ESRF. Since the energy spectrum of the Synchrotron Radiation (SR) depends on the beam energy, it is indeed possible to relate the variation of the beam energy with a variation of the produced SR flux. In this proceeding, we will present how we obtain a measurement of the momentum compaction using this dependence.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA17

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paper received ※ 04 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019

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