SAP2017 - List of Authors (Yang, J.C.)

Paper	Title	Page
MOPH17	Simulation of Beam Intensity Limitations under Space Charge Effects at BRing of HIAF	63
	J. Li, J.C. Yang IMP/CAS, Lanzhou, People's Republic of China
	The booster ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack ²³⁸U³⁵⁺ ions at the injection energy of 17MeV/u and deliver 1.0*10¹¹ of uranium ions at 800MeV/u. Two injection modes, with or without the electron cooling, are introduced. The transverse emittance evolution and beam lifetime are investigated by simulation of RF capture process for the fast cycle mode.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH17
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MOPH20	Simulation of Electron Cooling on Bunched Ion Beam	70
	H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang IMP/CAS, Lanzhou, People's Republic of China
	A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, IntraBeam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. In the paper, the cooling process was simulated for C beam in HIRFL-CSRm, and the result was compared with experiments, according to which the dependence of the minimum bunch length on beam and machine parameters was studied in the paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH20
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TUPH10	Electron Cooling of Bunched Ion Beam in Storage Ring	150
	L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao IMP/CAS, Lanzhou, People's Republic of China
	Funding: This work is supported by the National Natural Science Foundation of China (Project No.11575264, No.11375245 and No.11475235) and the Hundred Talents Project of the Chinese Academy of Sciences. A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, Intra-Beam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. Meanwhile, bunched ion beam cooling experiments have been carried out in the main cooling storage ring (CSRm) of the Heavy Ion Research Facility in Lanzhou (HIRFL), to investigate the minimum bunch length obtained by the cooling method, and study the dependence of the minimum bunch length on beam and machine parameters. It is observed that the IBS effect is dominant for low intensity beams, and the space charge effect is much more important for high intensity beams. The experimental results in CSRm shown a good agreement with the analytical model in the IBS dominated regime. The simulation work offers us comparable results to those from the analytical model both in IBS dominated and space charge dominated regimes.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH10
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TUPH11	Resonance Stop-bands Compensation for the Booster Ring at HIAF	153
	J. Li, J.C. Yang IMP/CAS, Lanzhou, People's Republic of China
	The Booster Ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack 1.0*10¹¹ number of 238U³⁵⁺ ions at the injection energy of 17MeV/u and deliver over such intensity beam to SRing (Spectrometer Ring) at 800MeV/u. However such intensity beam causes low-order resonances crossing during RF bunching. To keep a low beam loss, resonance stop-band compensation scheme is proposed covering the process from RF capture to the first stage of acceleration below 200MeV/u.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH11
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TUPH23	Beam Loss Simulation and Gas Desorption Measurement for HIAF	159
	P. Li, J.J. Chang, M. Li, W.L. Li, X.J. Liu, C.L. Luo, R.S. Mao, J. Meng, W.J. Xie, J.C. Yang, Y.J. Yuan, W.H. Zheng IMP/CAS, Lanzhou, People's Republic of China
	Funding: National Natural Science Foundation of China (11675235). Youth Innovation Promotion Association of Chinese Academy of Sciences 2016364 Large dynamic vacuum pressure rises of orders of magnitude which caused by the lost heavy ions can seriously limit the ion intensity and beam lifetime of the intermediate charge state heavy ion accelerator. The High Intensity heavy ion Accelerator Facility (HIAF) which will be built by the IMP will accumulate the intermediate charge state ion 238U³⁵⁺ to intensity 3×10¹⁰ ppp to different terminals for nuclear physics, nuclear astrophysics and so on. In order to control the dynamic vacuum effects induced by the lose beams and design the collimation system for the BRing of the HIAF, a newly developed dynamic vacuum simulation program is conducted to optimize the collimation efficiency. Furthermore, two dedicated desorption measurement setups have been established at the terminal of the CSRm and 320 kV HV platform to study the molecular desorption process and do the benchmarking of the simulation code. This presentation will describe the collimation efficiency optimization, measurement results with Sn beam at the CSRm and withthe Xe beam in the HV platform.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH23
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Paper

Title

Page

Simulation of Beam Intensity Limitations under Space Charge Effects at BRing of HIAF

63

J. Li, J.C. Yang
IMP/CAS, Lanzhou, People's Republic of China

The booster ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack ²³⁸U³⁵⁺ ions at the injection energy of 17MeV/u and deliver 1.0*10¹¹ of uranium ions at 800MeV/u. Two injection modes, with or without the electron cooling, are introduced. The transverse emittance evolution and beam lifetime are investigated by simulation of RF capture process for the fast cycle mode.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH17

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MOPH20

Simulation of Electron Cooling on Bunched Ion Beam

70

H. Zhao, J. Li, L.J. Mao, M.T. Tang, J.C. Yang, X.D. Yang
IMP/CAS, Lanzhou, People's Republic of China

A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, IntraBeam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. In the paper, the cooling process was simulated for C beam in HIRFL-CSRm, and the result was compared with experiments, according to which the dependence of the minimum bunch length on beam and machine parameters was studied in the paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-MOPH20

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

TUPH10

Electron Cooling of Bunched Ion Beam in Storage Ring

150

L.J. Mao, J. Li, X.M. Ma, M.T. Tang, J.C. Yang, X.D. Yang, H. Zhao
IMP/CAS, Lanzhou, People's Republic of China

Funding: This work is supported by the National Natural Science Foundation of China (Project No.11575264, No.11375245 and No.11475235) and the Hundred Talents Project of the Chinese Academy of Sciences.
A combination of electron cooling and RF system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multi-particle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, Intra-Beam Scattering (IBS), ion beam space charge field, transverse and synchrotron motion are considered. Meanwhile, bunched ion beam cooling experiments have been carried out in the main cooling storage ring (CSRm) of the Heavy Ion Research Facility in Lanzhou (HIRFL), to investigate the minimum bunch length obtained by the cooling method, and study the dependence of the minimum bunch length on beam and machine parameters. It is observed that the IBS effect is dominant for low intensity beams, and the space charge effect is much more important for high intensity beams. The experimental results in CSRm shown a good agreement with the analytical model in the IBS dominated regime. The simulation work offers us comparable results to those from the analytical model both in IBS dominated and space charge dominated regimes.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH10

Export •

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

TUPH11

Resonance Stop-bands Compensation for the Booster Ring at HIAF

153

J. Li, J.C. Yang
IMP/CAS, Lanzhou, People's Republic of China

The Booster Ring (BRing) of the new approved High Intensity heavy-ion Accelerator Facility (HIAF) in China is designed to stack 1.0*10¹¹ number of 238U³⁵⁺ ions at the injection energy of 17MeV/u and deliver over such intensity beam to SRing (Spectrometer Ring) at 800MeV/u. However such intensity beam causes low-order resonances crossing during RF bunching. To keep a low beam loss, resonance stop-band compensation scheme is proposed covering the process from RF capture to the first stage of acceleration below 200MeV/u.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH11

Export •

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

TUPH23

Beam Loss Simulation and Gas Desorption Measurement for HIAF

159

P. Li, J.J. Chang, M. Li, W.L. Li, X.J. Liu, C.L. Luo, R.S. Mao, J. Meng, W.J. Xie, J.C. Yang, Y.J. Yuan, W.H. Zheng
IMP/CAS, Lanzhou, People's Republic of China

Funding: National Natural Science Foundation of China (11675235). Youth Innovation Promotion Association of Chinese Academy of Sciences 2016364
Large dynamic vacuum pressure rises of orders of magnitude which caused by the lost heavy ions can seriously limit the ion intensity and beam lifetime of the intermediate charge state heavy ion accelerator. The High Intensity heavy ion Accelerator Facility (HIAF) which will be built by the IMP will accumulate the intermediate charge state ion 238U³⁵⁺ to intensity 3×10¹⁰ ppp to different terminals for nuclear physics, nuclear astrophysics and so on. In order to control the dynamic vacuum effects induced by the lose beams and design the collimation system for the BRing of the HIAF, a newly developed dynamic vacuum simulation program is conducted to optimize the collimation efficiency. Furthermore, two dedicated desorption measurement setups have been established at the terminal of the CSRm and 320 kV HV platform to study the molecular desorption process and do the benchmarking of the simulation code. This presentation will describe the collimation efficiency optimization, measurement results with Sn beam at the CSRm and withthe Xe beam in the HV platform.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-SAP2017-TUPH23

Export •

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