Extension of photomultiplier tube dynamic range for the LHAASO-KM2A electromagnetic particle detectors-猫眼课题宝

扩展 LHAASO-KM2A 电磁粒子探测器的光电倍增管动态范围

DOI：

10.1016/j.nima.2015.01.085

发表时间：

2015-05

期刊：

Nuclear Instruments and Methods in Physics Research A781 (2015) 34–38

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

lv hongkui

在大高空阵雨天文台（LHAASO）中，1km2array （KM2A）需要在大动态范围内对光强进行线性测量。本实验使用了5000多根光电倍增管（pmt），并开发为“双输出”器件（阳极和阳极）以满足相关要求。在这项研究中，阳极和第八节DY8 （DY8）的线性度受到空间电荷效应的限制，主要与PMT分压器的相对dynode电压比有关。设计了一种用于滨松R11102 PMT的分压器，并演示了显著增强的线性度。测试结果表明，该设计可以覆盖从20到2×105photoelectrons的宽动态范围，在PMT增益为105的情况下，阳极峰值电流达到380 mA，满足KM2A电磁粒子探测器的要求。利用仿真软件Multisim对电路设计进行了成功的仿真。描述了PMT性能测试和仿真的细节。

In the Large High Altitude Air Shower Observatory (LHAASO), the 1 km2array (KM2A) requires linear measurement of optical intensity with a wide dynamic range. Over 5000 photomultiplier tubes (PMTs) are employed in this experiment and developed as “two outputs” device (anode and dynode) to meet the relevant requirements. In this study, the linearity of the anode and the eighth dynode (DY8), which is limited by space charge effects and mainly related to the relative dynode voltage ratios of the PMT divider, is examined. A voltage divider for the Hamamatsu R11102 PMT is designed and a dramatically enhanced linearity is demonstrated. Test results show that this design can cover a wide dynamic range from 20 to 2×105photoelectrons and achieve a peak anode current of 380 mA at a PMT gain of 105, which satisfies the requirements of KM2A electromagnetic particle detectors. The circuit design has been successfully simulated using the simulation software Multisim. The details of PMT performance tests and simulations are described.