低频率低β低温氮掺杂HWR超导腔的性能测试  

Performance Test of Low β 162.5 MHz Nitrogen Infused HWR Cavity

作　　者：陈蒙[1,2] 朱凤 冯立文[1,2] 全胜文[1,2] 郝建奎 王芳[1,2] 林林[1,2] 陈术[1,2] 程安齐[1,2] CHEN Meng;ZHU Feng;FENG Liwen;QUAN Shengwen;HAO Jiankui;WANG Fang;LIN Lin;CHEN Shu;CHENG Anqi(State Key Laboratory of Nuclear Physics and Technology,Peking University,Beijing 100871,China;Institute of Heavy Ion Physics,School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]北京大学核物理与核技术重点实验室,北京100871 [2]北京大学物理学院重离子物理研究所,北京100871

出　　处：《原子能科学技术》2019年第9期1617-1620,共4页Atomic Energy Science and Technology

基　　金：973计划资助项目(2014CB845504)

摘　　要：中国原子能科学研究院和北京大学联合提出的北京在线同位素分离丰中子束流装置(BISOL)的强流氘驱动加速器采用半波长谐振(HWR)超导腔作为主要加速结构,加速能量为3~40MeV的强流氘离子。为此,北京大学设计并研究了可加速50mA氘束的β=0.09、频率为162.5MHzHWR超导腔。本文介绍该腔的设计、加工、表面处理及低温射频性能测试,并研究将低温氮掺杂这种新的表面处理方法用于该腔,进行低温超导性能测试。实验结果表明,采用圆锥形(taper)结构的HWR超导腔在2K温度下达17MV/m的高加速梯度。通过低温氮掺杂后,HWR超导腔在2K、10MV/m下的品质因数Q0提升了1倍,表明HWR超导腔有高加速梯度高品质因数的优点。Beijing isotope-separation-on-line neutron rich beam facility(BISOL)for both basic science and application is a project proposed by China Institute of Atomic Energy and Peking University.The intense deuteron driver accelerator(IDD)of BISOL would adopt superconducting half wave resonator(HWR)with low β and high current.Aβ=0.09 HWR cavity was developed in Peking University which has the ability to accelerate deuteron beam with current of 50 mA even for IDD future update.The design,fabrication,surface treatment and low temperature RF performance test results of HWR cavity were presented in this paper.A surface treatment of low temperature nitrogen infusion was applied to this cavity to study the effect of nitrogen infusion on low frequency lowβcavity.The results show that this tapered shape HWR cavity reaches high accelerating gradient of 17 MV/m at 2 K.After low temperature infusion,the quality factor Q0 almost doubles when the gradient is 10 MV/m at 2 K.

关 键 词：HWR超导腔 氮掺杂 垂直测试 

分 类 号：O571.6[理学—粒子物理与原子核物理]