Fusion Neutron Flux Monitor for ITER
Fusion Neutron Flux Monitor for ITER
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DOI：
10.1088/1009-0630/10/2/01
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发表时间：
2008-04
影响因子：
1.7
通讯作者：
Yang Jinwei;Yang Qingwei;Xiao Gongshan;Zhang Wei;Song Xian-ying;Li Xu
中科院分区：
文献类型：
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作者：
Yang Jinwei;Yang Qingwei;Xiao Gongshan;Zhang Wei;Song Xian-ying;Li Xu
中子通量监测仪（NFM）作为国际热核实验反应堆（ITER）的重要诊断子系统，可实时监测全球范围内的中子源强度、聚变功率和中子通量。设计了三种不同灵敏度和屏蔽材料的中子通量监测装置。通过MCNP（曼特-卡罗中性粒子输输码）计算，该扩展的NFM系统可以检测到104 n/(cm2？S)到1014n /(cm2? S)。它能够为ITER实验中遇到的所有操作模式提供精确的中子产率测量，包括现场校准。在信号处理单元中结合计数模式和坎贝尔（MSV；均方电压）模式，可以满足这些nfm的动态范围（107）和时间分辨率（1ms）的要求。基于不确定度分析，估算的总聚变中子产率的绝对测量精度在dd阶段前期和全功率DT运行模式下均能达到10%的要求水平。在先进的dd阶段，绝对测量精度优于20%。
Neutron flux monitor (NFM) as an important diagnostic sub-system in ITER (international thermonuclear experimental reactor) provides a global neutron source intensity, fusion power and neutron flux in real time. Three types of neutron flux monitor assemblies with different sensitivities and shielding materials have been designed. Through MCNP (Mante-Carlo neutral particle transport code) calculations, this extended system of NFM can detect the neutron flux in a range of 104 n/(cm2?s) to 1014 n/(cm2?s). It is capable of providing accurate neutron yield measurements for all operational modes encountered in the ITER experiments including the in-situ calibration. Combining both the counting mode and Campbelling (MSV; Mean Square Voltage) mode in the signal processing units, the requirement of the dynamic range (107) for these NFMs and time resolution (1 ms) can be met. Based on a uncertainty analysis, the estimated absolute measurement accuracies of the total fusion neutron yield can reach the required 10% level in both the early stage of the DD-phase and the full power DT operation mode. In the advanced DD-phase, the absolute measurement accuracy would be better than 20%.