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arXiv 0901.2430physics.ins-det
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质子辐照对多像素光子计数器的辐射损伤效应

Effects of radiation damage caused by proton irradiation on Multi-Pixel Photon Counters (MPPCs)

T. Matsumura, T. Matsubara, T. Hiraiwa, K. Horie, M. Kuze, K. Miyabayashi, A. Okamura, T. Sawada, S. Shimizu, T. Shinkawa, T. Tsunemi, M. Yosoi

摘要:

研究了质子感应辐射损伤对多像素光子计数器(MPPC)的影响。辐照MPPC样品的漏电流随辐照总剂量线性增加,这是由于辐射损伤,这是不完全恢复,即使从辐照一年后。在至少高达8.0 Gy($9.1\times10^7$ n/mm $^2$,1 MeV中子当量注量,$Φ_{\rm eq}$)的增益中未观察到显著变化。由于21 Gy照射后基线波动和噪音堆积,该设备完全失去了光子计数能力($Φ_{\rm eq}$中的$2.4\times10^8$ n/mm $^2$),这对于某些应用来说可能会出现问题,例如环形成像切伦科夫探测器。我们已经发现,脉冲高度分辨率在42 Gy照射($Φ_{\rm eq}$中的$4.8\times10^8$ n/mm $^2$)后已经略微恶化,其中测量的样品已经用几百个光子照射。在能量测量应用中应考虑这种影响。

英文摘要:

We have investigated the effects caused by proton-induced radiation damage on Multi-Pixel Photon Counter (MPPC), a pixelized photon detector developed by Hamamatsu Photonics. The leakage current of irradiated MPPC samples linearly increases with total irradiated doses due to radiation damage, which is not completely recovered even after a year from the irradiation. No significant change has been observed in the gains at least up to 8.0 Gy ($9.1\times10^7$ n/mm$^2$ in 1 MeV neutron equivalent fluence, $Φ_{\rm eq}$). The device has completely lost its photon-counting capability due to baseline fluctuations and noise pile-up after 21 Gy irradiation ($2.4\times10^8$ n/mm$^2$ in $Φ_{\rm eq}$), which might be problematic for some applications, such as ring-imaging Cherenkov detectors. We have found that the pulse-height resolution has been slightly deteriorated after 42 Gy irradiation ($4.8\times10^8$ n/mm$^2$ in $Φ_{\rm eq}$), where the measured sample has been illuminated with a few hundred photons. This effect should be considered in the case of energy-measurement applications.

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