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

在伽玛10串联反射镜（p型硅）和联合欧洲环面（JET）托卡马克（n型硅）中的x射线层析成像探测器阵列上研究了聚变产生的中子对x射线能量响应的影响。利用光子工厂的2.5 GeV正电子存储环的同步辐射，研究了这些探测器阵列在中子暴露后的x射线能量响应。为了估计中子对x射线敏感损耗厚度的影响，使用阻抗分析仪研究了探测器阵列材料性质的变化。为了模拟聚变产生的中子对等离子体x射线探测器的影响，利用回旋加速器设备进行了校准良好的中子辐照实验。在JET中，由于聚变等离子体射击以及回旋加速器产生的中子辐照，中子暴露后x射线响应的退化与x射线能量有功能依赖。x射线能量响应的恢复是随着探测器施加偏置的增加而发现的。这些性质可以用我们的理论很好地解释中子对扩散长度和探测器电阻率的影响。

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.