中国散裂中子源漂移管四极磁铁线圈冷却分析  

Cooling Analysis of Quadrupole Magnetic Coil of Drift Tube for China Spallation Neutron Source

作　　者：李波[1,2] 刘华昌 吴小磊[1,2] 巩克云 李阿红[1,2] 陈强 樊梦旭[1,2] 王云[1,2] 瞿培华 

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

出　　处：《核科学与技术》2020年第3期137-142,共6页Nuclear Science and Technology

摘　　要：中国散裂中子源漂移管直线加速器采用Alvarez结构,包含161台漂移管,每台漂移管内装有一台电四极磁铁以达到磁场梯度高且可调的要求,实现强聚焦。四极磁铁采用日本质子加速器研究中心研发的SAKAE结构,实现小体积、小孔径、高励磁电流、水冷线圈的要求。相比较于日本J-PARC的在35%占空比脉冲模式下工作的四极磁铁,CSNS漂移管四极磁铁工作在直流模式下,设计最高励磁电流570A,而且CSNS四极磁铁线圈的水冷管道横截面减小了35%,欧姆发热大,磁铁线圈的冷却及能否稳定运行分析十分重要。本文利用经验公式和软件Workbench分别计算了在最大励磁电流570 A,冷却水流量为1 L/min情况下,线圈的温升情况,并且对磁铁样机做了9小时的烤机实验,线圈温升与仿真结果基本一致,磁铁运行稳定。In China Spallation Neutron Source, classical Alvarez structure is used for the drift tube linac;the linac consists of 161 drift tubes, each with an electric quadrupole magnet to achieve high and adjustable magnetic gradient for strong focus. Quadrupole magnetic coil adopted SAKAE structure, which was invented by Japan Proton Accelerator Research Complex with small volume, small beam aperture, high excitation current and with water cooling. Compared with the pulse working mode with 35% duty ratio of J-PARC magnet, CSNS magnet works in DC mode with max current 570A;in addition, the water cooling pipe section of CSNS magnet reduced by 35%. So, it is very important to analyze the cooling and stable operation of the magnet coil due to the high ohmic heating. In this paper, the temperature rise of the magnetic coil under the condition of the maximum excitation current of 570 A and the cooling water flow of 1 L/min is calculated by empirical formula and software Workbench, and 9-hour-test was done on the prototype magnet, the magnet operated stably, the temperature rise is basically consistent with the simulation results.

关 键 词：漂移管加速器 四极磁铁 SAKAE结构 水冷 温升 

分 类 号：G63[文化科学—教育学]