We report the radiation damage results of two new types of Multi-Pixel Photon Counter (MPPC) under the 200 MeV proton beam, for cosmic gamma-ray observations with CubeSats. The new MPPCs, S13360-6050CS and S14160-6050HS, have recently become commercially available by Hamamatsu Photonics K.K. (HPK). After 100 rad irradiation, the dark current increased by a factor of $\sim$100 and the threshold energy of gamma-ray detection by CsI scintillator increased, but S14160-6050HS was less degraded. We then confirmed the annealing effects of the dark current and threshold energy for both. The decrease rate of the dark current in both MPPCs were similar to those in the previous works. At 20 °C, the threshold energies of both MPPCs reduced by several tens of percent after irradiation, but below 0 °C, the threshold energy of S14160-6050HS was not significantly lowered. We also confirmed that annealing began before one month post-irradiation.

我们报告了200 MeV质子束下两种新型的多像素光子计数器（MPPC）的辐射损伤结果，用于利用CubeSats进行宇宙伽玛射线观测。新的MPPC S13360-6050CS和S14160-6050HS最近已由Hamamatsu Photonics KK（HPK）出售。在100 rad辐射后，暗电流增加了$〜$100和CsI闪烁器检测γ射线的阈值能量增加，但S14160-6050HS的降解较少。然后，我们确认了暗电流和阈值能量对两者的退火作用。两种MPPC中暗电流的降低率与以前的工作相似。在20°C下，两个MPPC的阈值能量在辐照后降低了百分之几十，但在0°C以下，S14160-6050HS的阈值能量并未显着降低。我们还确认了退火是在辐照后一个月开始的。