中国散裂中子源二期双spoke超导腔设计  

Design of the China Spallation Neutron Source phaseⅡdouble spoke resonator

作　　者：周文中[1,2,3] 潘卫民 葛锐[1,3] 贺斐思 李中泉[1] 王子晗 米正辉 黄彤明[1] 戴劲 马强 徐妙富[1] 李梅 王小龙[1,2] 刘佰奇[1] 张新颖[1] 刘华昌[1,2] 彭军 王生[1,2,3] Zhou Wenzhong;Pan Weimin;Ge Rui;He Feisi;Li Zhongquan;Wang Zihan;Mi Zhenghui;Huang Tongming;Dai jin;Ma qiang;Xu Miaofu;Li Mei;Wang Xiaolong;Liu Baiqi;Zhang Xinying;Liu Huachang;Peng Jun;Wang Sheng(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]散裂中子源科学中心,广东东莞523803 [3]中国科学院大学,北京100049

出　　处：《强激光与粒子束》2023年第3期102-110,共9页High Power Laser and Particle Beams

摘　　要：中国散裂中子源是中国第一台、世界第四台脉冲型散裂中子源,其已于2020年2月达到100 kW功率的设计指标,运行稳定高效,供束效率位于国际前列。中国散裂中子源二期升级方案中总束流功率将升级到500 kW,其中直线加速器段将采用超导加速腔结构,束流能量由80 MeV提高到300 MeV。其中在80~165 MeV能量段采用324 MHz双spoke超导腔,在165~300 MeV能量段采用648 MHz 6-cell椭球超导腔。采用CST、COMSOL等仿真软件完成324 MHz双spoke超导腔的电磁、机械设计及优化,达到实际运行指标要求。为了提高腔运行的稳定性,在腔的设计中对E_(P)/E_(acc)着重进行了优化,使其尽量降低。The China Spallation Neutron Source(CSNS),located in Dongguan city,is the country’s first and only spallation neutron source.It is also the fourth spallation neutron source in the world.It achieved the design index of 100 kW power in February 2020,and its operation is reliable and efficient.The total beam power will be increased to 500 kW in the CSNS phase II upgrade design,where the linac beam energy will be boosted from 80 MeV to300 MeV and the peak current intensity will be increased from 15 mA to 50 mA by incorporating a superconducting linear accelerator.The double spoke resonator(DSR)will be used in the energy range of 80 MeV to 165 MeV.In the energy range of 165 MeV to 300 MeV,6-cell ellipsoidal cavity will be used.DSR has many advantages,such as large velocity acceptance,which allows the spoke cavity to be used for a wider range of velocities,small size,high shunt impedance and a high coupling degree,which allows the production error requirements to be relaxed and the frequency bandwidth to be broadened from neighboring modes,among others.The DSR performance,including electromagnetic properties and machine parameters,was simulated and optimized using CST,COMSOL and other simulation software,and it achieved the requirement of CSNS phaseⅡupgrade project.To improve the operating stability of the cavity,the design focused on minimizing E_(P)/E_(acc).

关 键 词：双spoke超导腔 氦压灵敏度 洛伦兹力失谐 二次电子倍增 调谐灵敏度 

分 类 号：TL503.2[核科学技术—核技术及应用]