IPAC2021 - List of Authors (Zheng, S.X.)

Paper	Title	Page
MOPAB189	Beam Commissioning of XiPAF Synchrotron	639
	H.J. Yao, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, W.B. Ye, H.J. Zeng, S.X. Zheng TUB, Beijing, People’s Republic of China W.L. Liu, D. Wang, Z.M. Wang NINT, Shannxi, People’s Republic of China
	XiPAF (Xi’an 200MeV Proton Application Facility) is a project to fulfill the need for the experimental simulation of the space radiation environment. It comprises a 7 MeV H⁻ linac, a 60-230 MeV proton synchrotron, and experimental stations. The Installation of the synchrotron, beamline and one experimental station were completed at the end of December 2019, and commissioning has just begun. Circulating beam around the synchrotron was observed on the first day of operation, and now 10-200 MeV proton beam directly extracted from the synchrotron had been transported to the experimental station for user experiments. The results of the commissioning and data analysis are presented in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB189
About •	paper received ※ 18 May 2021 paper accepted ※ 21 May 2021 issue date ※ 17 August 2021
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TUPAB168	Beam Commissioning of a 325 MHz Proton IH-DTL at XiPAF	1777
	P.F. Ma, X. Guan, R. Tang, M.W. Wang, X.W. Wang, Q.Z. Xing, W.B. Ye, S.X. Zheng TUB, Beijing, People’s Republic of China W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, Y. Yang, M.T. Zhao NINT, Shannxi, People’s Republic of China
	The Inter-Digital H-mode Drift Tube Linac (IH-DTL) is widely used as the main component of injectors for medical synchrotrons. This paper describes the beam commissioning of a compact 325 MHz IH-DTL with modified KONUS beam dynamics at Tsinghua University (THU). This IH-DTL accelerates the proton beam from 3 MeV to 7 MeV in 1m. The average energy of the beam is 7.0 MeV with the energy spread range of -0.6 MeV to 0.3 MeV. The output transverse normalized RMS emittance of the beam is 0.58 (x)/0.58 (y) pi mm mrad with the input emittance of 0.43 (x)/0.37 (y) pi mm mrad. The beam test results show good agreement with the beam dynamics design.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB168
About •	paper received ※ 08 May 2021 paper accepted ※ 16 June 2021 issue date ※ 14 August 2021
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TUPAB169	Overall Concept Design of a Heavy-Ion Injector for XiPAF-Upgrading	1781
	P.F. Ma, C.T. Du, X. Guan, Y. Lei, M.W. Wang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng TUB, Beijing, People’s Republic of China W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao NINT, Shannxi, People’s Republic of China
	A heavy-ion injector can be used for SEE study. In this paper, the primary beam dynamics design of a heavy-ion injector for the XiPAF upgrade is presented. The injector consists of an ECR heavy-ion source, a LEBT, an RFQ, and a DTL. The mass charge ratio can be up to 6.5. The RFQ can accelerate heavy ions to 500 keV/u, and the DTL can accelerate the ions to 2 MeV/u, which can meet the requirement of the synchrotron.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB169
About •	paper received ※ 16 May 2021 paper accepted ※ 16 June 2021 issue date ※ 11 August 2021
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TUPAB170	Decouple Transverse Coupled Beam in the DTL with Tilted PMQs	1785
	P.F. Ma, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng TUB, Beijing, People’s Republic of China Y.H. Pu, J. Qiao, C.P. Wang, X.C. Xie, F. Yang Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China
	The coupling of the beam is widely studied in the accelerator physics field. Projected transverse emittances easily grow up if the beam is transversely-coupled. If we decouple the transverse coupled beam, the transverse emittance can be small. The matrix approach based on the symplectic transformation theory for decoupling the coupled beam is summarized. For a proton accelerator, the transverse coupled beam is introduced by an RFQ tilted by 45°. The beam is decoupled with the first five tilted quadrupoles mounted in the DTL section. A study on the gradient choice of the quadrupoles and the space charge effect is given in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB170
About •	paper received ※ 08 May 2021 paper accepted ※ 21 June 2021 issue date ※ 28 August 2021
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TUPAB171	Linear Transfer Matrix of a Half Solenoid	1789
	P.F. Ma, X. Guan, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng TUB, Beijing, People’s Republic of China
	Solenoid magnets can provide strong transverse focusing to electrons and ions with relatively small energies. For the ECR heavy-ion source, the ions are extracted at the central area of the solenoid, the beam is coupled at the exit of the source. The coupling caused by the solenoids can lead to the growth of projected transverse emittance, which has been widely studied with great interest. It is important to study the transfer matrix of a half solenoid to study the beam optics in an ECR souce, thus the property of the beam can be given. Based on the transfer matrix calculation, the summary of the linear transfer matrix of a half solenoid can be given. The beam optics in a half solenoid is studied.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB171
About •	paper received ※ 18 May 2021 paper accepted ※ 28 June 2021 issue date ※ 29 August 2021
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TUPAB172	Quadrupole Magnet Design for a Heavy-Ion IH-DTL	1793
	P.F. Ma, C.T. Du, X. Guan, M.W. Wang, X.W. Wang, Y.L. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng TUB, Beijing, People’s Republic of China W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao NINT, Shannxi, People’s Republic of China
	Xi’an Proton Application Facility (XiPAF) will be upgraded to provide heavy-ion beams with a heavy-ion injector. The injector consists of an ECR heavy-ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole (RFQ), an Interdigital H-mode Drift Tube Linac (IH-DTL), and a Linac to Ring Beam Transport line (LRBT). The IH-DTL can accelerate the ions with mass to charge up to 6.5 from 0.4 MeV/u to 2 MeV/u. To provide transverse focusing, the electro-magnetic quadrupoles are installed inside the drift tubes of IH-DTL, thus the magnet needs to be high-gradient and compact. This paper gives the quadrupole magnet design for the heavy-ion IH-DTL. The results show that the quadrupole magnet design can meet the requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB172
About •	paper received ※ 08 May 2021 paper accepted ※ 21 June 2021 issue date ※ 23 August 2021
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPAB326	Injection Optimization and Study of XiPAF Synchrotron	2264
	X.Y. Liu, X. Guan, Y. Li, M.W. Wang, X.W. Wang, H.J. Yao, W.B. Ye, H.J. Zeng, S.X. Zheng TUB, Beijing, People’s Republic of China W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao NINT, Shannxi, People’s Republic of China
	The synchrotron of XiPAF (Xi’an 200MeV proton application Facility) is a compact proton synchrotron, which using H^- stripping injection and phase space painting scheme. Now XiPAF is under commissioning with some achievements, the current intensity after injection reach 43mA, the corresponding particle number is 2.3·10¹¹, and the injection efficiency is 57%. The simulation results by PyOrbit show that the injection efficiency is 77%. In this paper, we report how the injection intensity and efficiency were optimized. We analyzed the difference between simulation and experiments, and quantitatively investigate the factors affecting injection efficiency through experiments.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB326
About •	paper received ※ 14 May 2021 paper accepted ※ 22 June 2021 issue date ※ 22 August 2021
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WEPAB198	Beam Dynamics Design of a Synchrotron Injector with Laser-Accelerated Ions	3085
	M.Z. Tuo, X. Guan, W. Lu, P.F. Ma, Y. Wan, X.W. Wang, Q.Z. Xing, H.J. Yao, S.X. Zheng TUB, Beijing, People’s Republic of China
	We present, in this paper, the beam dynamics design of a linac injector with laser-accelerated carbon-ions for a medical synchrotron. In the design, the initial transverse divergence is reduced by two apertures. The beam is focused transversely through a quadrupole triplet lens downstream the apertures. The output energy spread of the extracted beam at the exit of the injector is compressed from ±6% to ±0.6% by a debuncher and a bend magnet system to meet the injection requirement for the synchrotron. By changing the width of imaging slit of the bend magnet system, the beam with energy of 4±0.024 MeV/u is extracted, and the particle number per shot and transverse emittances of the beam at the exit of the injector can be regulated through adjusting the slit height. The dynamics design can pave the way for the future concept research of the synchrotron injector.
	Poster WEPAB198 [1.034 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB198
About •	paper received ※ 16 May 2021 paper accepted ※ 16 June 2021 issue date ※ 18 August 2021
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WEPAB205	XiPAF Synchrotron Slow Extraction Commissioning	3106
	W.B. Ye, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, H.J. Yao, H.J. Zeng, S.X. Zheng TUB, Beijing, People’s Republic of China W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao NINT, Shannxi, People’s Republic of China
	Xi’an 200 MeV Proton Application Facility (XiPAF) is a project to fulfill the need for the experimental simulation of the space radiation environment. It comprises a 7 MeV H⁻ linac, a 60~230 MeV proton synchrotron, and experimental stations. Slow extraction commissioning for 60 MeV proton beam in XiPAF synchrotron has been finished. After commissioning, the maximal experiment extraction efficiency with the RF-knockout (RF-KO) method can up to 85%. The reason for beam loss has been analyzed and presented in this paper. Besides, an experiment of multiple energy extraction has been conducted in XiPAF synchrotron. The proton beams of 3 different energies were successfully extracted in 1.54 s.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB205
About •	paper received ※ 18 May 2021 paper accepted ※ 07 July 2021 issue date ※ 31 August 2021
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THPAB317	Experiment and Simulation Study on the Capture and Acceleration Process of XiPAF Synchrotron	4409
	Y. Li, X. Guan, X.Y. Liu, M.W. Wang, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng TUB, Beijing, People’s Republic of China W.L. Liu, D. Wang, Z.M. Wang, Y. Yang, M.T. Zhao NINT, Shannxi, People’s Republic of China
	The beam commissioning of the capture and acceleration process on the XiPAF (Xi’an 200MeV Proton Application Facility) synchrotron has been carried out. The efficiency of the experiment results has been compared with the simulation results. At present, the efficiency of the capture process with single-harmonic is about 73%, and the acceleration efficiency is about 82%, and the simulation results are 77% and 96% without space charge effect, respectively. In order to improve efficiency, dual-harmonic was used during the capture and acceleration process. During the experiment, the capture efficiency was increased by 5%, and the acceleration efficiency was increased by 4%. The capture efficiency decreases with the increase of the maximum RF voltages. We analyzed the reasons for the decrease in capture efficiency. In the next step, further verification will be carried out through experiments under different conditions.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB317
About •	paper received ※ 19 May 2021 paper accepted ※ 08 July 2021 issue date ※ 23 August 2021
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THPAB318	Uniformization of the Transverse Beam Profile with Nonlinear Magnet	4413
	Y. Li, X. Guan, X.Y. Liu, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng TUB, Beijing, People’s Republic of China Y. Yang NINT, Shannxi, People’s Republic of China
	The beam generated after slow extraction of the synchrotron is always not uniform and asymmetrical in transverse distribution. In practice, radiation therapy or radiation irradiation requires a high degree of uniformity of beam spot. Therefore, it is necessary to adjust the beam distribution with a nonlinear magnet and other elements on the transport line from synchrotron ring to beam target station. Nonlinear magnet has high requirements on beam quality. Before passing through the nonlinear magnet field, the beam center can be adjusted by taking advantage of the gradient change distribution of the nonlinear magnet’s transverse field map to achieve uniform distribution at the target station. As an example, we use the parameters of heavy ions of XiPAF (Xi’an 200MeV Proton Application Facility) to simulate the beam transport from synchrotron ring to beam target station.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB318
About •	paper received ※ 20 May 2021 paper accepted ※ 08 July 2021 issue date ※ 21 August 2021
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Paper

Title

Page

Beam Commissioning of XiPAF Synchrotron

639

H.J. Yao, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, W.B. Ye, H.J. Zeng, S.X. Zheng
TUB, Beijing, People’s Republic of China
W.L. Liu, D. Wang, Z.M. Wang
NINT, Shannxi, People’s Republic of China

XiPAF (Xi’an 200MeV Proton Application Facility) is a project to fulfill the need for the experimental simulation of the space radiation environment. It comprises a 7 MeV H⁻ linac, a 60-230 MeV proton synchrotron, and experimental stations. The Installation of the synchrotron, beamline and one experimental station were completed at the end of December 2019, and commissioning has just begun. Circulating beam around the synchrotron was observed on the first day of operation, and now 10-200 MeV proton beam directly extracted from the synchrotron had been transported to the experimental station for user experiments. The results of the commissioning and data analysis are presented in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB189

About •

paper received ※ 18 May 2021 paper accepted ※ 21 May 2021 issue date ※ 17 August 2021

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

TUPAB168

Beam Commissioning of a 325 MHz Proton IH-DTL at XiPAF

1777

P.F. Ma, X. Guan, R. Tang, M.W. Wang, X.W. Wang, Q.Z. Xing, W.B. Ye, S.X. Zheng
TUB, Beijing, People’s Republic of China
W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, Y. Yang, M.T. Zhao
NINT, Shannxi, People’s Republic of China

The Inter-Digital H-mode Drift Tube Linac (IH-DTL) is widely used as the main component of injectors for medical synchrotrons. This paper describes the beam commissioning of a compact 325 MHz IH-DTL with modified KONUS beam dynamics at Tsinghua University (THU). This IH-DTL accelerates the proton beam from 3 MeV to 7 MeV in 1m. The average energy of the beam is 7.0 MeV with the energy spread range of -0.6 MeV to 0.3 MeV. The output transverse normalized RMS emittance of the beam is 0.58 (x)/0.58 (y) pi mm mrad with the input emittance of 0.43 (x)/0.37 (y) pi mm mrad. The beam test results show good agreement with the beam dynamics design.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB168

About •

paper received ※ 08 May 2021 paper accepted ※ 16 June 2021 issue date ※ 14 August 2021

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TUPAB169

Overall Concept Design of a Heavy-Ion Injector for XiPAF-Upgrading

1781

P.F. Ma, C.T. Du, X. Guan, Y. Lei, M.W. Wang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
TUB, Beijing, People’s Republic of China
W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao
NINT, Shannxi, People’s Republic of China

A heavy-ion injector can be used for SEE study. In this paper, the primary beam dynamics design of a heavy-ion injector for the XiPAF upgrade is presented. The injector consists of an ECR heavy-ion source, a LEBT, an RFQ, and a DTL. The mass charge ratio can be up to 6.5. The RFQ can accelerate heavy ions to 500 keV/u, and the DTL can accelerate the ions to 2 MeV/u, which can meet the requirement of the synchrotron.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB169

About •

paper received ※ 16 May 2021 paper accepted ※ 16 June 2021 issue date ※ 11 August 2021

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TUPAB170

Decouple Transverse Coupled Beam in the DTL with Tilted PMQs

1785

P.F. Ma, X. Guan, R. Tang, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
TUB, Beijing, People’s Republic of China
Y.H. Pu, J. Qiao, C.P. Wang, X.C. Xie, F. Yang
Shanghai APACTRON Particle Equipment Company Limited, Shanghai, People’s Republic of China

The coupling of the beam is widely studied in the accelerator physics field. Projected transverse emittances easily grow up if the beam is transversely-coupled. If we decouple the transverse coupled beam, the transverse emittance can be small. The matrix approach based on the symplectic transformation theory for decoupling the coupled beam is summarized. For a proton accelerator, the transverse coupled beam is introduced by an RFQ tilted by 45°. The beam is decoupled with the first five tilted quadrupoles mounted in the DTL section. A study on the gradient choice of the quadrupoles and the space charge effect is given in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB170

About •

paper received ※ 08 May 2021 paper accepted ※ 21 June 2021 issue date ※ 28 August 2021

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TUPAB171

Linear Transfer Matrix of a Half Solenoid

1789

P.F. Ma, X. Guan, X.W. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
TUB, Beijing, People’s Republic of China

Solenoid magnets can provide strong transverse focusing to electrons and ions with relatively small energies. For the ECR heavy-ion source, the ions are extracted at the central area of the solenoid, the beam is coupled at the exit of the source. The coupling caused by the solenoids can lead to the growth of projected transverse emittance, which has been widely studied with great interest. It is important to study the transfer matrix of a half solenoid to study the beam optics in an ECR souce, thus the property of the beam can be given. Based on the transfer matrix calculation, the summary of the linear transfer matrix of a half solenoid can be given. The beam optics in a half solenoid is studied.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB171

About •

paper received ※ 18 May 2021 paper accepted ※ 28 June 2021 issue date ※ 29 August 2021

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

TUPAB172

Quadrupole Magnet Design for a Heavy-Ion IH-DTL

1793

P.F. Ma, C.T. Du, X. Guan, M.W. Wang, X.W. Wang, Y.L. Wang, Q.Z. Xing, X.D. Yu, S.X. Zheng
TUB, Beijing, People’s Republic of China
W. Chen, W.L. Liu, W. Lv, M.T. Qiu, B.C. Wang, D. Wang, M.C. Wang, Z.M. Wang, Y.H. Yan, M.T. Zhao
NINT, Shannxi, People’s Republic of China

Xi’an Proton Application Facility (XiPAF) will be upgraded to provide heavy-ion beams with a heavy-ion injector. The injector consists of an ECR heavy-ion source, a Low Energy Beam Transport line (LEBT), a Radio Frequency Quadrupole (RFQ), an Interdigital H-mode Drift Tube Linac (IH-DTL), and a Linac to Ring Beam Transport line (LRBT). The IH-DTL can accelerate the ions with mass to charge up to 6.5 from 0.4 MeV/u to 2 MeV/u. To provide transverse focusing, the electro-magnetic quadrupoles are installed inside the drift tubes of IH-DTL, thus the magnet needs to be high-gradient and compact. This paper gives the quadrupole magnet design for the heavy-ion IH-DTL. The results show that the quadrupole magnet design can meet the requirements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB172

About •

paper received ※ 08 May 2021 paper accepted ※ 21 June 2021 issue date ※ 23 August 2021

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TUPAB326

Injection Optimization and Study of XiPAF Synchrotron

2264

X.Y. Liu, X. Guan, Y. Li, M.W. Wang, X.W. Wang, H.J. Yao, W.B. Ye, H.J. Zeng, S.X. Zheng
TUB, Beijing, People’s Republic of China
W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
NINT, Shannxi, People’s Republic of China

The synchrotron of XiPAF (Xi’an 200MeV proton application Facility) is a compact proton synchrotron, which using H^- stripping injection and phase space painting scheme. Now XiPAF is under commissioning with some achievements, the current intensity after injection reach 43mA, the corresponding particle number is 2.3·10¹¹, and the injection efficiency is 57%. The simulation results by PyOrbit show that the injection efficiency is 77%. In this paper, we report how the injection intensity and efficiency were optimized. We analyzed the difference between simulation and experiments, and quantitatively investigate the factors affecting injection efficiency through experiments.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB326

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paper received ※ 14 May 2021 paper accepted ※ 22 June 2021 issue date ※ 22 August 2021

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WEPAB198

Beam Dynamics Design of a Synchrotron Injector with Laser-Accelerated Ions

3085

M.Z. Tuo, X. Guan, W. Lu, P.F. Ma, Y. Wan, X.W. Wang, Q.Z. Xing, H.J. Yao, S.X. Zheng
TUB, Beijing, People’s Republic of China

We present, in this paper, the beam dynamics design of a linac injector with laser-accelerated carbon-ions for a medical synchrotron. In the design, the initial transverse divergence is reduced by two apertures. The beam is focused transversely through a quadrupole triplet lens downstream the apertures. The output energy spread of the extracted beam at the exit of the injector is compressed from ±6% to ±0.6% by a debuncher and a bend magnet system to meet the injection requirement for the synchrotron. By changing the width of imaging slit of the bend magnet system, the beam with energy of 4±0.024 MeV/u is extracted, and the particle number per shot and transverse emittances of the beam at the exit of the injector can be regulated through adjusting the slit height. The dynamics design can pave the way for the future concept research of the synchrotron injector.

Poster WEPAB198 [1.034 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB198

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paper received ※ 16 May 2021 paper accepted ※ 16 June 2021 issue date ※ 18 August 2021

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WEPAB205

XiPAF Synchrotron Slow Extraction Commissioning

3106

W.B. Ye, X. Guan, Y. Li, X.Y. Liu, M.W. Wang, X.W. Wang, Y. Yang, H.J. Yao, H.J. Zeng, S.X. Zheng
TUB, Beijing, People’s Republic of China
W.L. Liu, D. Wang, M.C. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
NINT, Shannxi, People’s Republic of China

Xi’an 200 MeV Proton Application Facility (XiPAF) is a project to fulfill the need for the experimental simulation of the space radiation environment. It comprises a 7 MeV H⁻ linac, a 60~230 MeV proton synchrotron, and experimental stations. Slow extraction commissioning for 60 MeV proton beam in XiPAF synchrotron has been finished. After commissioning, the maximal experiment extraction efficiency with the RF-knockout (RF-KO) method can up to 85%. The reason for beam loss has been analyzed and presented in this paper. Besides, an experiment of multiple energy extraction has been conducted in XiPAF synchrotron. The proton beams of 3 different energies were successfully extracted in 1.54 s.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB205

About •

paper received ※ 18 May 2021 paper accepted ※ 07 July 2021 issue date ※ 31 August 2021

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THPAB317

Experiment and Simulation Study on the Capture and Acceleration Process of XiPAF Synchrotron

4409

Y. Li, X. Guan, X.Y. Liu, M.W. Wang, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng
TUB, Beijing, People’s Republic of China
W.L. Liu, D. Wang, Z.M. Wang, Y. Yang, M.T. Zhao
NINT, Shannxi, People’s Republic of China

The beam commissioning of the capture and acceleration process on the XiPAF (Xi’an 200MeV Proton Application Facility) synchrotron has been carried out. The efficiency of the experiment results has been compared with the simulation results. At present, the efficiency of the capture process with single-harmonic is about 73%, and the acceleration efficiency is about 82%, and the simulation results are 77% and 96% without space charge effect, respectively. In order to improve efficiency, dual-harmonic was used during the capture and acceleration process. During the experiment, the capture efficiency was increased by 5%, and the acceleration efficiency was increased by 4%. The capture efficiency decreases with the increase of the maximum RF voltages. We analyzed the reasons for the decrease in capture efficiency. In the next step, further verification will be carried out through experiments under different conditions.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB317

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paper received ※ 19 May 2021 paper accepted ※ 08 July 2021 issue date ※ 23 August 2021

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THPAB318

Uniformization of the Transverse Beam Profile with Nonlinear Magnet

4413

Y. Li, X. Guan, X.Y. Liu, X.W. Wang, Q.Z. Xing, Y. Yang, H.J. Yao, W.B. Ye, S.X. Zheng
TUB, Beijing, People’s Republic of China
Y. Yang
NINT, Shannxi, People’s Republic of China

The beam generated after slow extraction of the synchrotron is always not uniform and asymmetrical in transverse distribution. In practice, radiation therapy or radiation irradiation requires a high degree of uniformity of beam spot. Therefore, it is necessary to adjust the beam distribution with a nonlinear magnet and other elements on the transport line from synchrotron ring to beam target station. Nonlinear magnet has high requirements on beam quality. Before passing through the nonlinear magnet field, the beam center can be adjusted by taking advantage of the gradient change distribution of the nonlinear magnet’s transverse field map to achieve uniform distribution at the target station. As an example, we use the parameters of heavy ions of XiPAF (Xi’an 200MeV Proton Application Facility) to simulate the beam transport from synchrotron ring to beam target station.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB318

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paper received ※ 20 May 2021 paper accepted ※ 08 July 2021 issue date ※ 21 August 2021

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