北京HI-13串列加速器束流能量的重新刻度  

Beam Energy Re-calibration of Beijing HI-13 Tandem Accelerator

作　　者：骆天鹏 林承键[1,2] 马南茹 李康宁[1] 阚朝新[1] 王晓飞[1] 包轶文[1] 杨磊[1] 贾会明[1] 杨峰[1] 温培威[1] 庞廷涛 陈思 黄志杰 常昶 尹诚 杨炅和 段海锐 祝颂娴 范泽睿 王浩睿 傅凌逸 李慧艳 石广俊 张子豪 李智 LUO Tianpeng;LIN Chengjian;MA Nanru;LI Kangning;KAN Chaoxin;WANG Xiaofei;BAO Yiwen;YANG Lei;JIA Huiming;YANG Feng;WEN Peiwei;PANG Tingtao;CHEN Si;HUANG Zhijie;CHANG Chang;YIN Cheng;YANG Jionghe;DUAN Hairui;ZHU Songxian;FAN Zerui;WANG Haorui;FU Lingyi;LI Huiyan;SHI Guangjun;ZHANG Zihao;LI Zhi(China Institute of Atomic Energy,Beijing 102413,China;College of Physics and Technology,Guangxi Key Laboratory of Nuclear Physics and Technology,Guangxi Normal University,Guilin 541004,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]广西师范大学物理科学与技术学院,广西核物理与核技术重点实验室,广西桂林541004

出　　处：《原子能科学技术》2025年第4期966-972,共7页Atomic Energy Science and Technology

基　　金：国家重点研发计划(2022YFA1602302);国家自然科学基金(U2167204,12175314,12235020);稳定支持基础科研计划。

摘　　要：北京HI-13串列加速器是我国低能核物理领域的大科学装置,其能量分辨率可达0.02%,是开展高能量精确度核物理实验的利器,2007年进行束流能量重新刻度后经历了多次升级改造。为保证束流能量的精确度,需重新刻度分析磁铁常数K。本文利用反应道^(12)C(p,p)^(12)C、12C(p,p')^(12)C^(*)和^(12)C(p,α_(0))^(9)B的共振核反应,在束流能量4.793、9.127、14.231和18.460 MeV处对K进行刻度。在误差最小的14.231 MeV处,测得K为(803.52±0.09) keV·u/kGs^(2),相比2007年的刻度值增大了1.835%,相应束流能量展宽为(1.1±0.8) keV以及能量分辨率为(7.6±5.4)×10^(-5)。综合4个能点的结果,给出K(keV·u/kGs^(2))=800.612+2.054×10^(-4)E(keV),与能量呈弱线性正相关,同1994年首次刻度情况相似。The Beijing HI-13 Tandem Accelerator is a national scientific facility for nuclear physics research in China,characterized by an extremely small beam-energy spread with a resolution reaching0.02%.The analyzing magnet with a high momentum resolution is a key component of the tandem accelerator for achieving a high energy resolution.Due to the uniformity of the magnetic field and installation errors of the magnet,as well as variations in measurement positions,there may be a significant deviation between the actual deflection radius and the theoretical value,which therefore requires a calibration experiment to determine the magnet constant K with high precision and accuracy.After the accelerator was installed,it underwent the first calibration in 1994 and the second calibration in 2007.Since 2007,the accelerator has undergone several upgrades and modifications,especially the installation of the superconducting linear post-accelerator in 2019,wherein the analyzing magnet was disassembled and reassembled,and the magnetic field measurement instrument was changed from the previous nuclear magnetic resonance frequency meter to a Gauss meter.These changes may alter the K of the analyzing magnet,thereby affect the accuracy of the beam energy.Therefore,it is necessary to re-calibrate the analyzing magnet.The resonance nuclear reactions of the p+12C system were selected for this purpose.The main advantage of this system is that the compound nucleus 13N has an extremelynarrow resonant state at 15.064 6 MeV with a width of 0.93 keV,allowing for a precise calibration of the K.Additionally,the corresponding beam energy 14.231 MeV is almost in the middle energy range provided by the tandem accelerator.Two wider energy levels of 6.364 and 10.360 MeV were selected as well for preliminary calibration,allowing for a quick determination of a rough K and thus saving beam time.To test the stability of the K over a wider energy range,measurements were also conducted at a higher energy level of 18.961 MeV.The experiment was carried out at

关 键 词：串列加速器 能量刻度 分析磁铁 共振核反应 

分 类 号：TL52[核科学技术—核技术及应用]