MAGIC望远镜项目中GaAsP HPD研制的最新进展
Recent progress of GaAsP HPD development for the MAGIC telescope project
摘要：
如今，混合光子探测器（HPD）是少数几种可以提供出色的单光电子和多光电子（ph.e.）振幅分辨率最近开发的用于MAGIC望远镜项目的HPDs采用GaAsP光电阴极，即R9792 U-40，峰值量子效率（QE）超过50%，脉冲宽度约为2纳秒。此外，与传统的光电倍增管（PMT）相比，这些管的后脉冲速率非常低，即该值低~300倍。光阴极老化测量表明，在切伦科夫望远镜的标准操作条件下，寿命超过10年。在这里，我们想报告上述HPD的最新进展。
英文摘要：
Today the Hybrid Photon Detector (HPD) is one of the few low light level (LLL) sensors that can provide an excellent single and multiple photoelectron (ph.e.) amplitude resolution. The recently developed HPDs for the MAGIC telescope project with a GaAsP photocathode, namely the R9792U-40, provide a peak quantum efficiency (QE) of more than 50% and a pulse width of ~2 nsec. In addition, the afterpulsing rate of these tubes is very low compared to that of conventional photomultiplier tubes (PMTs), i.e. the value is ~300 times lower. Photocathode aging measurements showed life time of more than 10 years under standard operating conditions of the Cherenkov Telescopes. Here we want to report on the recent progress with the above mentioned HPDs.
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