SAP2017 - List of Authors (Zheng, W.H.)

Paper	Title	Page
TUPH16	The Experimental Setup of Desorption Measurement at CSRm and the Test Result
	W.H. Zheng, M. Li, P. Li IMP/CAS, Lanzhou, People's Republic of China
	The desorption processes caused by beam loss due to charge exchange interactions with residual gas has become an essential intensity limitation for high intensity heavy-ion accelerators. The collimation system made of low out-gassing rate material is designed to control the ion-beam loss induced desorption to enhance the beam intensity worldwide. Therefore the study and dedicated measurements of desorption rate became the key technology of the collimation system design in high intensity heavy-ion accelerators. The ion-beam loss induced desorption processes and their infestation were introduced in this paper firstly. Then the significance on desorption measurement was explained and the experimental setup of desorption measurement at CSRm was focused on. Furthermore, the desorption rate of copper coated with gold bombarded by tin beam was computed. The desorption measurements in subsequent steps at CSRm were given and the acquired data along with theoretical supports to the research on the collimation system in heavy-ion accelerators in future were also illustrated at the end of this paper.
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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

TUPH16

The Experimental Setup of Desorption Measurement at CSRm and the Test Result

W.H. Zheng, M. Li, P. Li
IMP/CAS, Lanzhou, People's Republic of China

The desorption processes caused by beam loss due to charge exchange interactions with residual gas has become an essential intensity limitation for high intensity heavy-ion accelerators. The collimation system made of low out-gassing rate material is designed to control the ion-beam loss induced desorption to enhance the beam intensity worldwide. Therefore the study and dedicated measurements of desorption rate became the key technology of the collimation system design in high intensity heavy-ion accelerators. The ion-beam loss induced desorption processes and their infestation were introduced in this paper firstly. Then the significance on desorption measurement was explained and the experimental setup of desorption measurement at CSRm was focused on. Furthermore, the desorption rate of copper coated with gold bombarded by tin beam was computed. The desorption measurements in subsequent steps at CSRm were given and the acquired data along with theoretical supports to the research on the collimation system in heavy-ion accelerators in future were also illustrated at the end of this paper.

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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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