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Temperature dependence of the plastic scintillator detector for DAMPE

王兆民  余玉洪  孙志宇  岳珂  闫铎  张永杰  周勇  方芳  黄文学  陈俊岭  
【摘要】:The Plastic Scintillator Detector(PSD) is one of the main sub-detectors in the DArk Matter Particle Explorer(DAMPE) project. It will be operated over a large temperature range from -10 to 30, so the temperature effect of the whole detection system should be studied in detail. The temperature dependence of the PSD system is mainly contributed by the three parts: the plastic scintillator bar, the photomultiplier tube(PMT), and the Front End Electronics(FEE). These three parts have been studied in detail and the contribution of each part has been obtained and discussed. The temperature coefficient of the PMT is -0.320(±0.033)%/, and the coefficient of the plastic scintillator bar is -0.036(±0.038)%/. This result means that after subtracting the FEE pedestal, the variation of the signal amplitude of the PMT-scintillator system due to temperature mainly comes from the PMT,and the plastic scintillator bar is not sensitive to temperature over the operating range. Since the temperature effect cannot be ignored, the temperature dependence of the whole PSD has been also studied and a correction has been made to minimize this effect. The correction result shows that the effect of temperature on the signal amplitude of the PSD system can be suppressed.

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