Characterization of radiation damage caused by 23 MeV protons in Multi-Pixel Photon Counter (MPPC)-猫眼课题宝

多像素光子计数器 (MPPC) 中 23 MeV 质子引起的辐射损伤的表征

DOI：

10.1016/j.nima.2016.03.092

发表时间：

2016-06

期刊：

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Zhang, Juan;Xu, Zhenling;Zhang, Yifei;Zhao, Jianling

设计了一个自动增益控制系统（AGC），用于对硬X射线调制望远镜（HXMT）上的磷硅氧探测器的增益进行连续监测和自动控制。它由一个Am 241放射源和一个光电探测器组成。Am 241放射源在塑料闪烁体（BC 440 M）内标记。由放射源衰变的α粒子产生的衰变光子由光电探测器读出。采用滨松公司生产的多像素光子计数器（MPPC）作为AGC的光电探测器。为了验证其在空间环境中应用的可行性，用23 MeV质子束辐照了4个MPPC（S10362-33- 050 C）。4个MPPC样品的质子积分注量分别为1.0× 108 pcm-2、2.0× 108 pcm-2、4.0× 108 pcm-2和1.0× 1010 pcm-2。结果表明，MPPC样品辐照损伤引起的漏电流增量与积分注量成线性关系。MPPC的脉冲幅度分辨率在辐照后几乎没有下降。当受到1.1× 10 9 cm− 2 1 MeV当量中子的辐照时，MPPC完全失去了光子计数能力，但仍可以作为AGC的光电探测器。当辐照的1 MeV中子当量注量达到2.7× 10 10 cm− 2时，MPPC不能作为AGC的光电探测器。

A automatic gain control system (AGC) is designed to continuously monitor and automatically control the gain of the phoswich detectors onboard the Hard X-ray Modulation Telescope (HXMT). It consists of a Am 241 radioactive source and a photo-detector. The Am 241 radioactive source is tagged within a plastic scintillator (BC440M). The scintillating photons produced by the decayed alpha particles from the radioactive source is readout by the photo-detector. The Multi-Pixel Photon Counter (MPPC) produced by Hamamatsu is used as the photo-detector for AGC. To verify the feasibility of its application in space environment, four MPPCs (S10362-33-050C) were irradiated by a beam of 23 MeV protons. The integrated proton fluence that exposed to the four MPPC samples are 1.0× 10 8 p cm− 2, 2.0× 10 8 p cm− 2, 4.0× 10 8 p cm− 2 and 1.0× 10 10 p cm− 2 respectively. It is found that the increment leakage current of the MPPC samples caused by irradiation damage increase linearly with the integrated fluence. The pulse-height resolution of the MPPC has deteriorated hardly after irradiation. When irradiated up to 1.1× 10 9 cm− 2 1 MeV equivalent neutrons, the MPPC completely lost its photon-counting capability but could still work as a photo-detector for AGC. The MPPC fails as a photo-detector for the AGC when the irradiated 1 MeV neutron equivalent fluences is up to 2.7× 10 10 cm− 2.