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采用符合方法,测量级联γ放射源60Co在光电倍增管(PMT)光阴极窗上激发产生的切伦科夫光,从而测定PMT渡越时间涨落. 用泊松加高斯卷积方法获得单(多)光电子峰位,处理不同光电子数的~PMT~渡越时间涨落.测试XP2020和透紫XP2020Q PMT结果显示, 测量的渡越时间与菲利浦公司给出的指标一致, 渡越时间涨落与光电子数满足平方根反比关系. 该方法对可分辨单(多)光电子峰的~PMT~是可行的. 相似文献
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A new charge measurement method, time over threshold (TOT), has been used in some gas detectors lately. Here TOT is studied for TOF system, made of plastic scintillator counter, which can simplify the electronics of the system. The signal characteristics are measured and analyzed with a high quality oscilloscope, including noise, pedestal, signal amplitude, total charge, rise time and the correlation between them. The TOT and charge are related and can be fitted by some empirical formula. The charge measurement resolution by TOT is given and this will help the design of TOF electronics. 相似文献
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