【摘要】 利用零角度单韧致辐射过程(e++e-→e++e-+γ),发射的γ光子的计数来监视正负电子对撞的亮度,γ光子的计数器包括转换体和熔融石英Cherenkov辐射体组合的探测系统。用宇宙线对Cherenkov探测系统进行刻度,表明该系统对最小电离粒子(MIP)的响应特性为:每个光电倍增管光阴极收集到的平均光电子数为6.9±3.7个;时间分辨0.25ns;前沿甄别阈为30mV,前级放大倍数为5(25)倍,光电倍增管高压为800V的条件下系统对MIP的效率好于98%。更多还原

【Abstract】 The counter of γ photons is a detecting system including converter and fused silica Cherenkov radiator to detect emitted γ photons from zero degree single Bremsstrahlung radiation Bhabha so that the luminosity of e⁺e^-collisions can be monitored.Cosmic ray test shows that the responses of the system on Minimum Ionization Particles（MIP） are: the average photoelectron number collected by the photo-cathode of each photomultiplier is 6.9±3.7;time resolution is 0.25ns;With 30mV threshold of the discriminators and ×5（25） magnification of preamplifiers,detection efficiency of the system for MIP is better than 98% when the high voltage of photomultiplier is 800V.更多还原