Studies of Physics Scaling and the Experimental Verification of the Effects of Fusion-Produced Neutrons on Semiconductor Detectors

研究了聚变产生的中子对伽马10串列镜（p型硅）和联合欧洲环（JET）托卡马克（n型硅）中X射线层析成像探测器阵列的X射线能量响应的影响。利用光子工厂2.5 GeV正电子储存环的同步辐射研究了这些探测器阵列在中子辐照后的X射线能量响应。为了估计中子对X射线敏感的耗尽厚度的影响，使用阻抗分析仪的探测器阵列的材料特性的变化进行了研究。利用回旋加速器进行了中子辐照实验，模拟了聚变产生的中子对等离子体X射线探测器的影响。由于聚变等离子体射流以及回旋加速器产生的中子辐照中子暴露后的X射线响应的退化被发现有一个功能依赖于X射线能量。恢复的X-射线能量响应被发现与增加施加的偏置到一个检测器。这些性质很好地解释使用我们的理论中的扩散长度和探测器的电阻率的中子效应。

The effects of fusion produced neutrons on the x-ray energy responses are investigated for x-ray tomography detector arrays in the GAMMA 10 tandem mirror (p-type silicon) and the Joint European Torus (JET) tokamak (n-type silicon). X-ray energy responses of these detector arrays after neutron exposure are studied using synchrotron radiation from a 2.5 GeV positron storage ring at the Photon Factory. For estimation of neutron effects on x-ray-sensitive depletion thickness, changes in the material properties of the detector arrays are investigated using an impedance analyzer. Well-calibrated neutron-irradiation experiments are performed using a cyclotron accelerator facility so as to simulate the effects of fusion produced neutrons on plasma x-ray detectors. Degradation of the x-ray responses after neutron exposure due to fusion plasma shots in JET as well as cyclotron-produced neutron irradiations are found to have a functional dependence on x-ray energy. Recovery of the x-ray energy response is found with increasing applied bias to a detector. Such properties are well interpreted using our theory in terms of the neutron effects on the diffusion length and the resistivity of detectors.