BESⅢ端盖TOF探测器的研制  

R&D of the Endcap TOF Detector for BESⅢ

作　　者：唐泽波[1] 李昕[1] 安少辉[1] 陈宏芳[1] 衡月昆[2] 李澄[1] 邵明[1] 孙勇杰[1] 王贻芳[2] 吴冲[2] 曾晖 赵力[1] 赵小建[2] 

机构地区：[1]中国科学技术大学近代物理系高能组,合肥230026 [2]中国科学院高能物理研究所,北京100049

出　　处：《高能物理与核物理》2006年第5期445-448,共4页High Energy Physics and Nuclear Physics

摘　　要：针对BESⅢ端盖TOF的研制方案,设计和制作了特殊构型的闪烁探测器．研究了光电倍增管 (R5924)和塑料闪烁体(BC404,BC408,EJ204)的性能．测量了几种包装材料对单个闪烁探测器模块光收集和本征时间分辨的影响．使用800MeV实验电子束对探测器模块的测量结果显示,采用EJ204和 BC404晶体其时间分辨小于80ps;采用ESR材料包装可获得较大的输出信号,提高了探测器的性能．The Endcap TOF （ETOF） of Beijing Spectrometer（BESⅢ） is consisted of 2×48 pieces of trapezoidal scintillator. Its main physics goal is to realize 2σ π/k separation at momentum up to 0.8GeV/c, and to reach the intrinsic time resolution of 80ps. In this paper, the properties of photomultiplier tube（R5924） and plastic scintillators （BC404, BC408, EJ204） are studied, a ETOF module with different wrappings is tested with the beam of 800MeV electron at IHEP. The results show that the time resolution of an ETOF module using scintillator BC404 or E J204 is below 80ps which includes the electronic fluctuation. The ESR wrapping can efficiently enhance the amplitude of the output pulse and improve the performance of the TOF detector.

关 键 词：BESⅢ 飞行时间探测器 时间分辨 

分 类 号：TL81[核科学技术—核技术及应用]