MRPC-TOF时间性能和刻度方法的研究  

Study on MRPC-TOF Timing Properties and Calibration Methods

作　　者：李亮[1] 邵明[1] 陈宏芳[1] 李澄[1] 唐泽波[1] 董昕[1] 汪晓莲[1] 

机构地区：[1]中国科学技术大学近代物理系,合肥230026

出　　处：《高能物理与核物理》2007年第6期576-580,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(10375062;10610286);中国科学院知识创新工程(KJCX2-YW-A14)资助~~

摘　　要：研制的由28个多气隙电阻板室(MRPC)模块构成飞行时间探测系统,从2003年以来在RHIC- STAR实验上成功运行并获得了大量的实验数据．为了深入了解MRPC实际运行中的性能,采用质心能量200GeV的Au-Au对撞的实验数据,对MRPC-TOF的刻度方法进行了深入研究,主要包括:(1)对现有的刻度方法做了进一步的改进;(2)对粒子入射角度等因素进行了修正;(3)STAR径迹重建的位置分辨率对MRPC时间分辨率影响．用改进后的刻度和修正方法,计算得到MRPC的本征时间分辨率为大约60ps,与束流实验结果相近．A prototype Time-of-Flight （TOF） detector, consisting of 28 Multi-gap Resistive Plate Chambers （MRPC）, has been successfully operated at RHIC-STAR experiment since 2003. Extensive study on the calibration procedure of the MRPC-TOF is performed in order to better understand MRPC＇s performance. Improvements and extension on current calibration method are discussed. Furthermore, it has been found that the position resolution of the reconstruction system at STAR has significant impact on the MRPC time resolution. After subtracting this effect, the intrinsic time resolution of MRPC is found to be about 60ps, which is in good agreement to beam test results.

关 键 词：MRPC TOF 时间分辨率 刻度 

分 类 号：O572.21[理学—粒子物理与原子核物理]