The large-area silicon photodiode PIN is one of the candidates for the lead tungstenate photon detector readout in the large heavy ion collision experiment ALICE. The PIN-diode was assembled with the lead tungstate crystal and a low-noise preamplifier into a complete detector unit. A beam test of a 5 \(\times \) 5 detector unit matrix was carried out on the SPS accelerator at CERN. The energy resolution was measured with the electron beam energy ranging from 5 to 40 GeV. The summation correction method was implemented, and an excellent linearity of the signal peak value of the detector versus the nominal beam energy was obtained. In addition, a preliminary study of the punch-through effect in the high energy range was performed. A bulge of high-energy signals was identified at beam energies above 10 GeV, but only accounting for less than 1% of the accumulated statistics. Considering the mean energy of the excess is twice large than the regular signal, it was probably mainly due to the accumulation caused by two electrons hitting the detector at the same time, rather than the punch-through effect.

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在CERN SPS上用5到40 GeV的电子能量对PIN二极管读出的PWO量热计进行射束测试

大面积硅光电二极管PIN是大型重离子碰撞实验ALICE中钨酸铅光子探测器读数的候选之一。PIN二极管与钨酸铅晶体和低噪声前置放大器组装成一个完整的检测器单元。5 \（\ times \）的光束测试在CERN的SPS加速器上执行5个检测器单元矩阵。能量分辨率是用5至40 GeV的电子束能量测量的。实施了总和校正方法，并获得了检测器信号峰值与标称束能量的极好的线性关系。另外，对高能量范围内的穿通效应进行了初步研究。在高于10 GeV的光束能量处发现了高能量信号的凸起，但仅占累计统计数据的不到1％。考虑到多余能量的平均能量是常规信号的两倍，这可能主要是由于两个电子同时撞击检测器而不是穿通效应​​引起的累积。