Abstract The “fission electron-collection” neutron detector (FECND) is a fission-based neutron detector with flat and fast responses, and is a promising choice for the diagnostics of fusion neutron flux and spectrum. Due to its low sensitivity, the detector output is weak and is disturbed easily in calibration experiments. The backgrounds in the calibration primarily come from scattered neutrons and the γ rays induced by neutron inelastic scattering. A symmetrical structure of FECND was proposed to suppress the output of γ rays, and its effectiveness was validated by Monte Carlo simulations. A method was presented to eliminate the impact of scattered neutrons by utilizing the solid angle effect and the energy difference between source neutrons and scattered neutrons. Through calibration experiments and analyses, a D-T sensitivity of (8.6 ± 0.2)×10−20 C·cm2 was obtained for the FECND.

中文翻译：

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“裂变电子收集”中子探测器的校准研究

摘要 “裂变电子收集”中子探测器（FECND）是一种基于裂变的中子探测器，具有平坦、快速的响应，是聚变中子通量和光谱诊断的一种很有前景的选择。由于其灵敏度低，探测器输出较弱，在校准实验中容易受到干扰。校准中的背景主要来自散射中子和中子非弹性散射引起的γ射线。提出了一种对称结构的 FECND 来抑制 γ 射线的输出，并通过 Monte Carlo 模拟验证了其有效性。提出了一种利用立体角效应和源中子与散射中子能量差消除散射中子影响的方法。通过校准实验和分析，DT灵敏度为（8.6±0.