一种稳定磁场的方法  

A method for stabilizing magnetic field

作　　者：王思广[1] Bouwhuis M Holler Y Lenisa P Reggiani D Marukyan H Tait P 叶震宇[7] 叶云秀[7] 

机构地区：[1]北京大学物理学院 [2]Department of Physics University of Illinois,Urbana,Illinois61801,USA [3]Desy Deutsches Elektronen-Synchrotron,22603Hamburg,Germany [4]Istituto Nazionale di Fisica Nucleare Sezione di Ferrara and Dipartimento di Fisica,Universitàdi Ferrara,44100Ferrara,Italy [5]Yerevan Physics Institute 375036Yerevan,Armenia [6]Physikalisches Institut Universit?t Erlangen-Nürnberg,91058Erlangen,Germany [7]中国科学技术大学现代物理系

出　　处：《核技术》2005年第4期297-300,共4页Nuclear Techniques

摘　　要：本文叙述了HERMES横向极化气体靶的外磁场的磁感应强度随时间减弱现象的发现,探讨了这种减弱的原因。由此开发了一种全自动补偿系统。利用该系统后,磁场的稳定度得到很大提高,如在某测量位置,预置磁感应强度为338.6mT的磁场的稳定度由原来的±0.45mT变化幅度改善到±0.004mT(Stat)±0.048(Syst)mT。The magnetic flux density of the HERMES transverse polarized gas target changing with time and an automatic compensating system for stabilizing the strong magnetic field are described in this paper. The instability of magnetic field was found to be related to temperature change of the ferromagnetics. With the automatic system, the field in the monitoring point around 338.6 mT can be stabilized with the accuracy of ±0.004 mT(Stat) or ±0.045 mT (Syst) instead of ±0.45 mT without the system.

关 键 词：极化靶 磁感应强度 全自动补偿系统 

分 类 号：O571.323[理学—粒子物理与原子核物理]