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arXiv 1806.04571physics.ins-dethep-ex
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ProtoDUNE双相位检测器的低温R5912-20Mod光电倍增管特性

Cryogenic R5912-20Mod Photomultiplier Tube Characterization for the ProtoDUNE Dual Phase Detector

D. Belver, E. Calvo, C. Cuesta, A. Gallego-Ros, I. Gil-Botella, S. Jiménez, C. Lastoria, T. Lux, C. Palomares, D. Redondo, F. Sanchez, J. Soto-Oton, A. Verdugo

摘要:

深层地下中微子实验是一个双站点实验,用于长基线中微子振荡研究,以及中微子天体物理学和核子衰变研究。远探测器是一个40千吨的地下液态氩时间投影室(LAr TPC),其中光子探测器系统增加了精确的计时能力。ProtoDUNE双相位探测器将由一个6x6 x6 m^3的LAr TPC组成,将在CERN中微子平台上运行,光子探测系统将由来自滨松的8英寸低温光电倍增管组成。研究了R5912- 20 Mod型光电倍增管在低温下的性能,包括暗电流、增益以及与光强和脉冲频率的线性关系。此外,PMT的基础设计进行了验证。在寒冷的,减少的PMT放大,或疲劳效应,测量的PMT输出电流增加,无论是由于高增益,光强度或速率。此外,40光电倍增管的特性的结果将用于ProtodUNE双相。

英文摘要:

The Deep Underground Neutrino Experiment (DUNE) is a dual-site experiment for long baseline neutrino oscillation studies, and for neutrino astrophysics and nucleon decay searches. The far detector is a 40-kton underground liquid argon time-projection-chamber (LAr TPC), in which the photon detector system adds precise timing capabilities. The ProtoDUNE dual phase detector will consist of a 6x6x6 m^3 LAr TPC to be operated at the CERN Neutrino Platform and the photon detection system will be formed by 8-inch cryogenic photomultipliers from Hamamatsu. The PMT model (R5912-20Mod) performance at cryogenic temperature is studied including dark current, gain, and linearity with the light intensity and pulse rate. In addition, the PMT base design is validated. At cold, a decrease of the PMT amplification, or fatigue effect, is measured as the PMT output current increases, either, due to high gain, light intensity or rate. Also, the characterisation results of the 40 photomultipliers to be used in ProtoDUNE dual phase are presented.

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