新型快速的 Blue-LED 快时间探测器标定系统

A New Timing Calibration System of Fast Timing Detectors Using Blue LED

为了能够连续有规律地监测宇宙线广延大气簇射（ＥＡＳ）阵列快时间探测器和电子学系统各部分的性能随时间的变化，羊八井宇宙线ＥＡＳ实验使用了一套由ＣＡＭＡＣ－ＤＡＣ、ＴＫＯ－Ｂｕｆｅｒ、Ｂｌｕｅ－ＬＥＤ和ＬＥＤ－ａｍｐ构成的快时间探测器标定系统。该标定系统的速度快、易于扩展、引起的数据采集系统的死时间少，对于３０ＴｅＶ以上的空气簇射事例，羊八井二期阵列的角分辨可达０．５°，此外它还能监测光电倍增管周围温度的变化。

A new timing calibration system has been developed using Blue LED for monitoring time offset value of fast timing scintillation counters by Tibet EAS collaboration. It is composed of CAMAC DAC, TKO Buffer, Blue LED and LED amp. Angular resolution of Tibet Ⅱ EAS array equipped with this system is about 0.5° for more than 30 TeV air shower. In addition, it can monitor the temperature around PMT and can be enlarged easily. (