Effects of longitudinal parasitic modes on the beam dynamics for the ADS driving linac in China

For the accelerator driven subcritical system （ADS） main linac in China, two families of superconducting elliptical radio frequency （RF） cavities will be used to accelerate the proton beam from 180 MeV to 1.5 GeV. When the proton beam traverses in the RF cavity, the excited parasitic modes, like hig...

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Published inChinese physics C Vol. 39; no. 1; pp. 91 - 97
Main Author 程鹏 裴士伦 王九庆 李智慧 唐靖宇
Format Journal Article
LanguageEnglish
Published 2015
Subjects
ADS
Beams (radiation)
China
Dynamical systems
Dynamics
Holes
Linear accelerators
Proton beams
Radio frequencies
中国
加速器驱动次临界系统
家庭射频
寄生
束流动力学
直线加速器
驾驶
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Summary:For the accelerator driven subcritical system （ADS） main linac in China, two families of superconducting elliptical radio frequency （RF） cavities will be used to accelerate the proton beam from 180 MeV to 1.5 GeV. When the proton beam traverses in the RF cavity, the excited parasitic modes, like high order modes （HOMs） and same order modes （SOMs）, may drive the beam to become unstable and increase the cryogenic load, thus putting a limitation on the normal operation of the accelerator. In this paper, by using a numerical code SMD based on the ROOT environment, the effects of longitudinal parasitic modes on the beam dynamics for the ADS driving linac in China have been investigated systematically, while parasitic modes which increase cryogenic loss have not been included in this paper. Some conclusions concerning the beam energy ranging from 180 MeV to 1.5 GeV have been obtained.
Bibliography:11-5641/O4
parasitic mode, HOM, SOM, beam dynamics, beam instability
For the accelerator driven subcritical system （ADS） main linac in China, two families of superconducting elliptical radio frequency （RF） cavities will be used to accelerate the proton beam from 180 MeV to 1.5 GeV. When the proton beam traverses in the RF cavity, the excited parasitic modes, like high order modes （HOMs） and same order modes （SOMs）, may drive the beam to become unstable and increase the cryogenic load, thus putting a limitation on the normal operation of the accelerator. In this paper, by using a numerical code SMD based on the ROOT environment, the effects of longitudinal parasitic modes on the beam dynamics for the ADS driving linac in China have been investigated systematically, while parasitic modes which increase cryogenic loss have not been included in this paper. Some conclusions concerning the beam energy ranging from 180 MeV to 1.5 GeV have been obtained.
CHENG Peng, PEI Shi-Lun, WANG Jiu-Qing, LI Zhi-Hui, TANG Jing-Yu（Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China）
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/39/1/017005