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李钟汕, 杜衡, 殷学军, 夏佳文, 原有进, 杨建成, 李小妮, 李朋, 李杰, 郑文亨, 葛文文, 曲国锋, 申国栋, 张小虎, 乔舰, 王科栋. CSR-LINAC IH-RFQ的高频电磁设计[J]. 原子核物理评论, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
引用本文: 李钟汕, 杜衡, 殷学军, 夏佳文, 原有进, 杨建成, 李小妮, 李朋, 李杰, 郑文亨, 葛文文, 曲国锋, 申国栋, 张小虎, 乔舰, 王科栋. CSR-LINAC IH-RFQ的高频电磁设计[J]. 原子核物理评论, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
LI Zhongshan, DU Heng, YIN Xuejun, XIA Jiawen, YUAN Youjin, YANG Jiancheng, LI Xiaoni, LI Peng, LI Jie, ZHENG Wenheng, GE Wenwen, QU Guofeng, SHEN Guodong, ZHANG Xiaohu, QIAO Jian, WANG Kedong. RF Structure Design for CSR-LINAC IH-RFQ[J]. Nuclear Physics Review, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
Citation: LI Zhongshan, DU Heng, YIN Xuejun, XIA Jiawen, YUAN Youjin, YANG Jiancheng, LI Xiaoni, LI Peng, LI Jie, ZHENG Wenheng, GE Wenwen, QU Guofeng, SHEN Guodong, ZHANG Xiaohu, QIAO Jian, WANG Kedong. RF Structure Design for CSR-LINAC IH-RFQ[J]. Nuclear Physics Review, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140

CSR-LINAC IH-RFQ的高频电磁设计

doi: 10.11804/NuclPhysRev.35.02.140
基金项目: 广东省引进创新创业团队计划资助项目(2016ZT06G373);国家自然科学基金资助项目(11375243,11475235,11405237)
详细信息
    作者简介:

    李钟汕(1969-),男,湖南邵阳人,在读博士研究生,从事核技术及应用研究;E-mail:lizhsh89@impcas.ac.cn

    通讯作者: 殷学军,E-mail:yinxj@impcas.ac.cn;杜衡,E-mail:duheng@impcas.ac.cn
  • 中图分类号: TL53

RF Structure Design for CSR-LINAC IH-RFQ

Funds: Guangdong Innovative and Entrepreneurial Research Team Program (2016ZT06G373); National Natural Science Foundation of China (11375243, 11405237, 11475235)
  • 摘要: 中国科学院近代物理研究所在CSR-LINAC项目中设计了一台108.48 MHz的IH型RFQ直线加速器。该RFQ可以将质荷比为3~7的离子从4 keV/u加速到300 keV/u。在完成束流动力学设计的基础上,主要针对RFQ腔体的高频电磁设计展开了研究,同时利用了电磁场仿真和束流动力学模拟来研究腔体的四极场不平整度和二极场及其动力学影响。未经调谐的情况下,腔体的谐振频率为108.15 MHz,腔体空载品质因子Q0为5 910,腔体功耗为123 kW。通过在支撑板两端增加底切的设计,将腔体的四极场不平整度由-21%~ 12%优化至±2.5%,满足了束流动力学要求。腔体的二极场为-3%~ -2.2%,使得束流在垂直方向小幅振荡,RFQ的垂直方向接受度减小5%。为了保证功率馈入时反射较小,将耦合器设置在临界耦合状态,耦合面积为940 mm2。为了补偿腔体的频率偏差和漂移,设计了调谐量分别为707和132 kHz的固定调谐器和可动调谐器。


    The 108.48 MHz IH type RFQ for CSR-LINAC project is under design at Institute of Modern Physics, Chinese Academy of Sciences. This RFQ can accelerate heavy ions with mass to charge ratio of 3~7 from 4 keV/u to 300 keV/u. According to the beam dynamics requirement, the RF structure design has been finished. The quadrupole field unflatness and dipole field of the cavity were studied by electromagnetic simulation and beam dynamics simulation. The frequency of the cavity without tuning is 108.15 MHz, the Q0 of the cavity is 5910, and the RF power loss is 123 kW. The quadrupole field unflatness of ±2.5%,which was -21%~12% before optimizing, is achieved to meet dynamics requirement through the undercuts in cavity supporters. The dipole field of -3%~ -2.2% causes the oscillation of the beam center and acceptance reduction of 5%. The power coupler must be in critical coupling state with the coupling area of 940 mm2 for minimum reflection coefficient. The tuners, consist of coarse and fine tuners with frequency shift of 707 and 132 kHz respectively, is used for tuning of frequency deviation of the cavity.
  • [1] XIA Jiawen, ZHAN Wenlong, WEI Baowen, et al. Nucl Instr Meth A, 2002, 488(1):11.
    [2] ZHANG Xiaohu, YUAN Youjin, XIA Jiawen, et al. Chinese Physics C, 2014, 38(10):74.
    [3] ZHANG Xiaohu. Beam dynamics design and research of the Linac injectors in HIRFL[D]. Lanzhou:Institute of Modern Physics, Chinese Academy of Sciences, 2014:127. (in Chinese) (张小虎. HIRFL重离子直线注入器的动力学设计与研究[D]. 兰州:中国科学院近代物理研究所, 2014:127.)
    [4] JAMESON R A. NATO ASI Series B:Physics, 1988, 178:497.
    [5] LIU G, LU Y R, HE Y, et al. Nucl Instr Meth A, 2013, 701(3):186.
    [6] YIN X J, YUAN Y J, XIA J W, et al. Phys Rev ST Accel Beams, 2016, 19(1):010402.
    [7] LI C, SUN L, HE Y, et al. Nucl Instr Meth A, 2013, 729(1-2):426.
    [8] WANG Z J, HE Y, JIA H, et al. Proceedings of LINAC2012[C]. Tel-Aviv, Israel, 2012.
    [9] KLABUNDE J. Proceedings of the 1988 Linear Accelerator Conference[C]. Williamsburg, Virginia, USA, 2012.
    [10] KLABUNDE J. Proceedings of the 1992 Linear Accelerator Conference[C]. Ottawa, Ontario, Canada, 1992.
    [11] RATZINGER U, KASPAR K, MALWITZ E, et al. Nucl Instr Meth, 1998, 415(1):281.
    [12] KASPAR K, RATZINGER U. DESIGN OF THE GSI 36 MHZ RFQ ACCELERATOR ON THE BASE OF MAFIA CALCULATIONS, 1996.
    [13] KOSCIELNIAK S, LAXDAL R E, LEE R, et al. Particle Accelerator Conference, 1997[C]. Vancouver, British Columbia, Canada, 1997:1102.
    [14] LAXDAL R E, BAARTMAN R A, ROOT L. Proceedings of the 1999 Particle Accelerator Conference[C]. New York,1999:3534.
    [15] CRANDALL K R. Proceedings of the 1979 Linear Accelerator Conference[C]. Montauk, New York, USA, 1979:205.
    [16] ZHANG C, SCHEMPP A. Nucl Instr Meth A, 2008, 586(2):153.
    [17] ZHANG C, SCHEMPP A. Nucl Instr Meth A, 2009, 609(2-3):95.
    [18] CHUAN ZHANG. Linac Design for Intense Hadron Beams[D]. Frankfurt am Main, 2009(12):54.
    [19] KASPAR K, RATZINGER U. the 5th European Particle Accelerator Conference[C]. Sitges, Barcelona, Spain, 1996.
    [20] RATZINGER U, KASPAR K, MALWITZ E, et al. Nucl Instr Meth A, 1998, 415(1):281.
    [21] CST-Computer Simulation Technology. www.cst.com.
    [22] LIU Ge. Study on the Theoretical Design and Experimental Research of a Continuous Wave High Charge State Heavy Ion RFQ[D]. Beijing:Peking University, 2014:68. (in Chinese) (刘戈. 连续波高电荷态重离子RFQ加速器的理论设计与实验研究[D]. 北京大学, 2014:68.)
    [23] URIOT D. TraceWin[M]. CEA Saclay, 2013.
    [24] BAILEY R. Proceedings of the CAS-CERN Accelerator School:RF for accelerators, Ebeltoft, Denmark, 2011:125.
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出版历程
  • 收稿日期:  2017-07-19
  • 修回日期:  2017-10-12
  • 刊出日期:  2018-06-20

CSR-LINAC IH-RFQ的高频电磁设计

doi: 10.11804/NuclPhysRev.35.02.140
    基金项目:  广东省引进创新创业团队计划资助项目(2016ZT06G373);国家自然科学基金资助项目(11375243,11475235,11405237)
    作者简介:

    李钟汕(1969-),男,湖南邵阳人,在读博士研究生,从事核技术及应用研究;E-mail:lizhsh89@impcas.ac.cn

    通讯作者: 殷学军,E-mail:yinxj@impcas.ac.cn;杜衡,E-mail:duheng@impcas.ac.cn
  • 中图分类号: TL53

摘要: 中国科学院近代物理研究所在CSR-LINAC项目中设计了一台108.48 MHz的IH型RFQ直线加速器。该RFQ可以将质荷比为3~7的离子从4 keV/u加速到300 keV/u。在完成束流动力学设计的基础上,主要针对RFQ腔体的高频电磁设计展开了研究,同时利用了电磁场仿真和束流动力学模拟来研究腔体的四极场不平整度和二极场及其动力学影响。未经调谐的情况下,腔体的谐振频率为108.15 MHz,腔体空载品质因子Q0为5 910,腔体功耗为123 kW。通过在支撑板两端增加底切的设计,将腔体的四极场不平整度由-21%~ 12%优化至±2.5%,满足了束流动力学要求。腔体的二极场为-3%~ -2.2%,使得束流在垂直方向小幅振荡,RFQ的垂直方向接受度减小5%。为了保证功率馈入时反射较小,将耦合器设置在临界耦合状态,耦合面积为940 mm2。为了补偿腔体的频率偏差和漂移,设计了调谐量分别为707和132 kHz的固定调谐器和可动调谐器。


The 108.48 MHz IH type RFQ for CSR-LINAC project is under design at Institute of Modern Physics, Chinese Academy of Sciences. This RFQ can accelerate heavy ions with mass to charge ratio of 3~7 from 4 keV/u to 300 keV/u. According to the beam dynamics requirement, the RF structure design has been finished. The quadrupole field unflatness and dipole field of the cavity were studied by electromagnetic simulation and beam dynamics simulation. The frequency of the cavity without tuning is 108.15 MHz, the Q0 of the cavity is 5910, and the RF power loss is 123 kW. The quadrupole field unflatness of ±2.5%,which was -21%~12% before optimizing, is achieved to meet dynamics requirement through the undercuts in cavity supporters. The dipole field of -3%~ -2.2% causes the oscillation of the beam center and acceptance reduction of 5%. The power coupler must be in critical coupling state with the coupling area of 940 mm2 for minimum reflection coefficient. The tuners, consist of coarse and fine tuners with frequency shift of 707 and 132 kHz respectively, is used for tuning of frequency deviation of the cavity.

English Abstract

李钟汕, 杜衡, 殷学军, 夏佳文, 原有进, 杨建成, 李小妮, 李朋, 李杰, 郑文亨, 葛文文, 曲国锋, 申国栋, 张小虎, 乔舰, 王科栋. CSR-LINAC IH-RFQ的高频电磁设计[J]. 原子核物理评论, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
引用本文: 李钟汕, 杜衡, 殷学军, 夏佳文, 原有进, 杨建成, 李小妮, 李朋, 李杰, 郑文亨, 葛文文, 曲国锋, 申国栋, 张小虎, 乔舰, 王科栋. CSR-LINAC IH-RFQ的高频电磁设计[J]. 原子核物理评论, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
LI Zhongshan, DU Heng, YIN Xuejun, XIA Jiawen, YUAN Youjin, YANG Jiancheng, LI Xiaoni, LI Peng, LI Jie, ZHENG Wenheng, GE Wenwen, QU Guofeng, SHEN Guodong, ZHANG Xiaohu, QIAO Jian, WANG Kedong. RF Structure Design for CSR-LINAC IH-RFQ[J]. Nuclear Physics Review, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
Citation: LI Zhongshan, DU Heng, YIN Xuejun, XIA Jiawen, YUAN Youjin, YANG Jiancheng, LI Xiaoni, LI Peng, LI Jie, ZHENG Wenheng, GE Wenwen, QU Guofeng, SHEN Guodong, ZHANG Xiaohu, QIAO Jian, WANG Kedong. RF Structure Design for CSR-LINAC IH-RFQ[J]. Nuclear Physics Review, 2018, 35(2): 140-146. doi: 10.11804/NuclPhysRev.35.02.140
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