Diagnostic “Divertor Neutron Flux Monitor (DNFM)” is one of the diagnostics to determine the neutron yield and the thermonuclear power of the ITER facility. To detect neutrons, this diagnostic uses three detector modules. The expected neutron flux in the detector module location is 10⁶–10¹³ n $\cdot $ cm $^{-2}\,\,\cdot \,\,\text{s}^{-1}$ . The neutron flux and the neutron yield should be measured with 1-ms time resolution and 10% maximum relative error. The detector module consisting of six fission chambers (FCs) is used to meet these requirements, and each FC signal is processed by pulse counting, Campbell, and current measurement methods simultaneously. According to the data of each measurement method, the normalized count rates (NCRs) of the FCs and the detector module and the neutron flux at its location are calculated. The data acquisition (DAQ) system processes the signals of the single detector module and transmits the data of the NCR and the neutron flux of each detector and entire detector module to the upper-level system. To verify the technique solutions, the DAQ system prototype was manufactured. To study the characteristics of this prototype, a set of laboratory tests was carried out. This article illustrates the structure of the DAQ system and the implementation of the FC signal processing methods. The results of the study of the DAQ system prototype for a single detector module are given.

中文翻译：

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ITER转向器中子通量监测诊断数据采集系统研究

诊断“分流器中子通量监测器（DNFM）”是确定 ITER 设施的中子产额和热核功率的诊断方法之一。为了检测中子，该诊断使用三个检测器模块。探测器模块位置的预期中子通量为 10 ⁶ –10 ¹³ n $\cdot $ 厘米 $^{-2}\,\,\cdot \,\,\text{s}^{-1}$ . 中子通量和中子产额应以 1 毫秒的时间分辨率和 10% 的最大相对误差进行测量。由六个裂变室 (FC) 组成的探测器模块用于满足这些要求，每个 FC 信号同时通过脉冲计数、坎贝尔和电流测量方法进行处理。根据每种测量方法的数据，计算出FCs和探测器模块的归一化计数率（NCR）及其所在位置的中子通量。数据采集​​（DAQ）系统处理单个探测器模块的信号，并将NCR的数据和每个探测器和整个探测器模块的中子通量数据传输到上级系统。为了验证技术解决方案，制造了 DAQ 系统原型。为了研究这个原型的特性，进行了一系列实验室测试。本文阐述了数据采集系统的结构和FC信号处理方法的实现。给出了单个检测器模块的 DAQ 系统原型的研究结果。