| BEPCⅡ真空内扭摆磁铁波纹管RF屏蔽结构的改进 |
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| 引用本文： | 王建力,肖琼,王娜,王梨兵.BEPCⅡ真空内扭摆磁铁波纹管RF屏蔽结构的改进[J].真空科学与技术学报,2011,31(2):212-215. |
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| 作者姓名： | 王建力 肖琼 王娜 王梨兵 |
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| 作者单位： | 中国科学院高能物理研究所,北京,100049 |
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| 基金项目： | 北京正负电子对撞机重大改造工程资助课题 |
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| 摘 要： | BEPCⅡ真空内扭摆磁铁的波纹管在电子束流的高流强运行中发生了损伤和真空泄漏。对损伤原因进行了分析,怀疑是波纹管RF屏蔽结构的弹簧片与接触套之间存在间隙,导致了高次模泄漏。如果波纹管没有压缩到设计的安装长度,弹簧片与接触套之间可能存在1 mm的间隙。利用MAFIA软件对这种情况下的尾场和阻抗进行计算,结果表明尾场收敛很慢,最大的尾场振幅为0.08 V/pC,阻抗在1.32 GHz存在窄带的共振峰。在该间隙处会发生高次模泄漏,有必要对屏蔽结构加以改进。对屏蔽结构的弹簧接触方式做了改进,将弹簧片改为环形的弹簧丝,最大调节量由4.0 mm提高到7.9 mm,且杜绝了间隙。300~500 mA的束流实验表明,屏蔽结构改进后,波纹管附近的真空度从2.66×10-7Pa提高到6.65×10-8Pa,波纹管的温度从40℃以上降低到25℃以下。
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| 关 键 词： | BEPCⅡ 波纹管 RF屏蔽 尾场 阻抗 MAFIA |
RF Shielding Improvement of Bellows of in-Vacuum Wiggler for Second Phase Construction of Beijing Electron-Positron Collider |
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| Wang Jianli,Xiao Qiong,Wang Na,Wang Libing.RF Shielding Improvement of Bellows of in-Vacuum Wiggler for Second Phase Construction of Beijing Electron-Positron Collider[J].JOurnal of Vacuum Science and Technology,2011,31(2):212-215. |
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| Authors: | Wang Jianli Xiao Qiong Wang Na Wang Libing |
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| Affiliation: | Wang Jianli,Xiao Qiong,Wang Na,Wang Libing(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Here,we addressed one of the possible reasons responsible for damages and leaks of the bellows of the in vacuum wiggler in the second phase construction of Beijing Electron-Positron Collider(BEPCII) and its solution.The damage could be caused by high order modes(HOM),and the leak may originate from a gap between the spring washer and the contact sleeve of the RF shielding structure in the bellows.If the bellows was not compressed to its designed installation length,mm wide gap may exist.After the wakefield ... |
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| Keywords: | MAFIA |
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