北京谱仪附近空间电磁噪声测量和抑制工作  

The measurements of repressing the electromagnetic noise around the BES

作　　者：陈黎明[1] 张仲峪[1] 郝耀斗[1] 郝祖岳[1] 王锋[1] 

机构地区：[1]中国科学院高能物理研究所,北京100039

出　　处：《核电子学与探测技术》2001年第5期373-376,325,共5页Nuclear Electronics & Detection Technology

摘　　要：当北京正负电子对撞机 (BEPC)提供的 e+ / e-束流通过北京谱仪 (BES)时 ,在对撞区附近会产生一个空间电磁信号。采用单点测量和矩阵测量等方法 ,对其进行时域和频域测量及分析 ,为寻找BES附近的干扰噪声源 ,提供了非常有益的数据。确认了静电分离器的屏蔽改进效果 ,并且找到了 BES附近另一个干扰噪声源 -束流管道上安装 DCCT(直流电流传感器 )位置附近的陶瓷结构的不连续性而泄漏的电磁波。对其采取了屏蔽、接地等一系列电磁兼容措施 ,极大地净化了 BES附近的空间电磁环境 ,提高了 BES对 BEPC束流的利用率 ,改善了Space electromagnetic signal will occurre around the collision region, when the e +/e beams in the BEPC passes through the BES . By means of 'One point detetion',or'Matrix detection' methods, the signal is measured and analyszed on time domain and frequency domain in our experiment. Many useful data is provided for reaching the interference sources around the BES. The effective result on ESP shield is confirmed and another interference source near BES is found, which is the leak electromagnetic signal comes from the DCCT (Direct current sensor) due to the uncontinuity on its ceramic structure. Several electromagnetic compatibility measures such as shielding and grounding DCCT is executed, therefore the space electromagnetic environment near BES is significantly purified. The BES utilization ratio for BEPC beam is enhanced and the reliability of BES data is improved.

关 键 词：北京谱仪 空间电磁噪声 静电分离器 直流电流传感器 测量 抑制 电磁干扰源 

分 类 号：TL817[核科学技术—核技术及应用]