VERITAS的校准技术
Calibration Techniques for VERITAS
摘要：
VERITAS是由四个相同的望远镜组成的阵列，旨在探测和测量能量超过100 GeV的天体物理伽马射线。每台望远镜都使用一个直径为12米的反射镜，从入射伽马射线引发的空气簇射中收集切伦科夫光，并将其引导到由499个光电倍增管组成的“照相机”上，由闪光ADC读出。我们在这里描述的校准方法，用于确定的参数，这是必要的数字化PMT脉冲转换为伽马射线的能量和方向的值。使用激光脉冲来确定和监测PMT的增益进行了讨论，作为测量的绝对吞吐量的望远镜使用μ介子环。
英文摘要：
VERITAS is an array of four identical telescopes designed for detecting and measuring astrophysical gamma rays with energies in excess of 100 GeV. Each telescope uses a 12 m diameter reflector to collect Cherenkov light from air showers initiated by incident gamma rays and direct it onto a `camera' comprising 499 photomultiplier tubes read out by flash ADCs. We describe here calibration methods used for determining the values of the parameters which are necessary for converting the digitized PMT pulses to gamma-ray energies and directions. Use of laser pulses to determine and monitor PMT gains is discussed, as are measurements of the absolute throughput of the telescopes using muon rings.
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