Jo Jungmin, Cheon MunSeong, Kim Junghee, An YoungHwa, Park Seungil, Chung Kyoung-Jae, Hwang Y S
Department of Nuclear Engineering, Seoul National University, Seoul 08826, South Korea.
National Fusion Research Institute, Daejeon 34133, South Korea.
Rev Sci Instrum. 2017 Sep;88(9):093503. doi: 10.1063/1.5000857.
Feasibility of using conventional photo-multiplier tubes (PMTs) without a scintillator as an ex-vessel radiation detector in a tokamak environment is studied. Basic irradiation tests using standard gamma ray sources and a d-d neutron generator showed that the PMT is responding both to gamma photons and neutrons, possibly due to the direct generation of secondary electrons inside the PMT by the impingement of high energy photons. Because of the selective sensitivity of the PMT to hard x-ray and neutrons in ohmic and neutral beam injected plasmas, respectively, it is shown that the PMT with certain configuration can be utilized either to monitor the fluctuation in the fusion neutron generation rate or to study the behavior of runaway electrons in tokamaks.
研究了在托卡马克环境中使用不带闪烁体的传统光电倍增管（PMT）作为容器外辐射探测器的可行性。使用标准伽马射线源和d-d中子发生器进行的基本辐照测试表明，PMT对伽马光子和中子都有响应，这可能是由于高能光子撞击导致PMT内部直接产生二次电子。由于PMT分别对欧姆加热和中性束注入等离子体中的硬x射线和中子具有选择性灵敏度，结果表明，具有特定配置的PMT可用于监测聚变中子产生率的波动或研究托卡马克中逃逸电子的行为。
