用于低动量高精度测量的漂移室氦基混合气体性能的研究  

Study of Properties of Helium-Based Gas Mixtures for Use ofLow Momentum and High Precision Measurement in Drift Chambers

作　　者：陈昌[1] 张勤俭[1] 马基茂[1] 黄秀萍[1] 易凯 郑树臣[1] 

机构地区：[1]中国科学院高能物理研究所

出　　处：《高能物理与核物理》1998年第9期787-793,共7页High Energy Physics and Nuclear Physics

摘　　要：报道了用小型均匀场漂移室对不同比例的氦基混合气体Ｈｅ／ＣＨ４（８０／２０，７０／３０）和Ｈｅ／ｉＣ４Ｈ１０（８５／１５，８０／２０，７０／３０）的电子漂移速度和用正比计数管对上述气体的电子放大系数测量的结果，实验结果同用Ｇａｒｆｉｅｌｄ程序包计算的结果进行了比较，符合得很好。对Ｈｅ／ＣＨ４（８０／２０）混合气体得到漂移速度ｕｄ≈２．７ｃｍ／μｓ，其放大系数Ｍ在适当工作电压下能控制在１０４－１０５之间，这种混合气体可以作为低动量高精度测量的漂移室工作气体较为理想的候选者。Measured drift velocities using an uniform field drift chamber and multiplication factors obtained with proportional tubes in He-based gas mixtures He + CH4(80/20, 70/ 30) and He+ iC4H10 (85/ 15, 80/ 20,70/ 30) are reported.The results are good agreement with calculations by Garfield Code. The Saturated drift velocity is Vd≈ 2.7cm /μs and multiplication factor of M≈104- 1 05 at certain working voltage is manageable in He / CH4 (80 / 20) gas mixture,and it is good candidate of working gas for use of low momentum and high precision measurement in the drift chambers.

关 键 词：漂移室 氦基混合气体 漂移速度 放大系数 

分 类 号：O572.21[理学—粒子物理与原子核物理]