BESⅢ晶体量能器设计中的蒙特卡罗研究  

Monte Carlo Study of Performance of BES Ⅲ CsI Crystal Calorimeter

作　　者：刘春秀[1] 傅成栋[1] 周莉[1] 张勤俭[1] 夏小米[1] 赖元芬[1] 李金[1] 方建[1] 陈沅[1] 蔡啸[1] 尚雷[1] 王曼[1] 吕军光[1] 王贻芳[1] 

机构地区：[1]中国科学院高能物理研究所,北京100039

出　　处：《高能物理与核物理》2004年第4期335-339,共5页High Energy Physics and Nuclear Physics

基　　金：国家杰出青年科学基金 ( 10 2 2 5 5 2 4)资助~~

摘　　要：在BESⅢ晶体量能器的设计、研制过程中 ,利用 7× 7CsI晶体探测单元的模拟程序 ,对其性能做了精细的蒙特卡罗研究 .给出了与非相干噪声、能量线性、晶体光输出均匀性、位置依赖等相关的模拟结果 .In the process of design and research of BES Ⅲ crystal calorimeter, we made a detailed Monte Carlo study for the performance of BES Ⅲ CsI crystal calorimeter on the basis of the detection cell of 7×7 CsI matrix. Results are presented on incoherent noise, on energy linearity, on uniformity of the crystal light output, on position dependence. Those results show that the energy resolution of the 5×5 matrix sum is about 2.1% for 1 GeV photon and the best energy resolution of the lower energy photon is obtained with the energy threshold of 2.5 σ noise. The energy deposit in the matrix decreases by about 1% and the energy resolution degrades by about 0.3% when 800MeV photons are injected in the gap region between two crystals. The average position resolution is about 6.3 mm at 800 MeV.

关 键 词：晶体量能器 能量分辨 位置分辨 能量线性 光输出均匀性 蒙特卡罗研究 北京谱仪 

分 类 号：TH89[机械工程—仪器科学与技术]