arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.0531physics.ins-det
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用硅光电倍增器测量切伦科夫光子

Measurements of Cherenkov Photons with Silicon Photomultipliers

S. Korpar, I. Adachi, H. Chagani, R. Dolenec, K. Hara, T. Iijima, P. Krizan, S. Nishida, R. Pestotnik, A. Stanovnik

摘要:

一种新的光子探测器,硅光电倍增器(SiPM),已在接近聚焦环成像切伦科夫(RICH)计数器,暴露于宇宙射线粒子在卢布尔雅那,并在KEK研究设施的2 GeV的电子束进行了测试。这种类型的RICH检测器是KEK B工厂BELLE检测器的粒子识别检测器升级的候选产品,由于存在高磁场,因此必须使用SiPM、微通道板光电倍增管或混合雪崩光电检测器,而不是传统的光电倍增管(PMT)。在这两个实验中,发现SiPM与PMT相比更有利,每单位面积的光子探测率更高。通过使用半球形和截棱锥光导将光子集中到有效表面区域上,光输出显著增加。还提出了阵列中SiPM之间的假重合对暗噪声的贡献的估计。

英文摘要:

A novel photon detector, the Silicon Photomultiplier (SiPM), has been tested in proximity focusing Ring Imaging Cherenkov (RICH) counters that were exposed to cosmic-ray particles in Ljubljana, and a 2 GeV electron beam at the KEK research facility. This type of RICH detector is a candidate for the particle identification detector upgrade of the BELLE detector at the KEK B-factory, for which the use of SiPMs, microchannel plate photomultiplier tubes or hybrid avalanche photodetectors, rather than traditional Photomultiplier Tubes (PMTs) is essential due to the presence of high magnetic fields. In both experiments, SiPMs are found to compare favourably with PMTs, with higher photon detection rates per unit area. Through the use of hemispherical and truncated pyramid light guides to concentrate photons onto the active surface area, the light yield increases significantly. An estimate of the contribution to dark noise from false coincidences between SiPMs in an array is also presented.

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