Testing of a sCVD diamond detection system in the CROCUS reactor
Testing of a sCVD diamond detection system in the CROCUS reactor
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在 CROCUS 反应器中测试 sCVD 金刚石检测系统
DOI：
10.1140/epja/i2018-12519-1
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
E. Griesmayer
中科院分区：
文献类型：
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作者：
M. Hursin;C. Weiss;P. Frajtag;V. Lamirand;G. Perret;P. Kavrigin;A. Pautz;E. Griesmayer
摘要：本文介绍了 NEUTON 检测系统在洛桑联邦理工学院 (EPFL) 零功率反应堆 CROCUS 中的测试情况。 NEUTON 由一个 $4 {\rm mm} \times 4$4 mm ×4 mm sCVD 金刚石探测器和一个 6Li 转换器以及相关的采集电子设备组成。它由 CIVIDEC Instrumentation GmbH 开发。在核反应堆的混合辐射场中使用带有转换器的金刚石探测器具有挑战性，因为这些探测器通过 6Li 中的转换对伽马射线、快中子和热中子敏感。在 NEUTON 中，通过分析探测器的信号脉冲形状，实时实现伽马射线的抑制。为此，一些信号特征（幅度、面积和 FWHM）被记录在系统的集成现场可编程门阵列 (FPGA) 中。这种处理不会引起任何死区时间。 CROCUS 中的测量首次证明了 NEUTON 等系统检测和分离快中子、热中子和伽马射线的能力。系统响应与反应堆功率（高达 35W）呈线性关系，其热灵敏度为 $(3.5\pm 0.2)\times 10^{-5}$(3.5±0.2)×10-5 cps/nv。
Abstract.The paper describes the testing of the NEUTON detection system into CROCUS, the zero-power reactor of the École Polytechnique Fédérale de Lausanne (EPFL). NEUTON is composed of a $4 {\rm mm} \times 4$4 mm ×4 mm sCVD diamond detector with a 6Li converter and the associated acquisition electronics. It is developed by CIVIDEC Instrumentation GmbH. The use of a diamond detector with converter in the mixed radiation field of a nuclear reactor is challenging because these detectors are sensitive to gamma-rays, fast neutrons and thermal neutrons through conversion in 6Li . In NEUTON, the rejection of gamma-rays is achieved in real time, via the analysis of the signal pulse shape from the detector. To do so, a few signal characteristics (amplitude, area and FWHM) are recorded in the integrated Field Programmable Gate Arrays (FPGA) of the system. This treatment does not induce any dead time. Measurements in CROCUS demonstrated for the first time the capability of a system like NEUTON to detect and separate fast neutrons, thermal neutrons, and gamma-rays. The system response was shown to be linear with respect to the reactor power (up to 35W) and its thermal sensitivity was found to be $(3.5\pm 0.2)\times 10^{-5}$(3.5±0.2)×10-5 cps/nv.