Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres

In order to realize real-time fusion neutron spectrum diagnosis for the HL_2A Tokamak, a Bonner Sphere Spectrometer （BSS） array has been developed, consisting of eight polyethylene spheres （PS） with embedded aHe proportional counters. To validate its spectrometric capability, spectrum measurement of...

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Bibliographic Details
Published in:Chinese physics C 2015-08, Vol.39 (8), p.62-65
Main Author: 曹靖 蒋春雨 曹宏睿 阴泽杰
Format: Article
Language:English
Subjects:
Arrays
Consistency
Geant4
Mathematical analysis
Monte Carlo methods
Proportional counters
Response functions
Tokamak devices
中子能谱仪
光谱性能
响应函数
实验
托卡马克装置
正比计数器
验证
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Summary:In order to realize real-time fusion neutron spectrum diagnosis for the HL_2A Tokamak, a Bonner Sphere Spectrometer （BSS） array has been developed, consisting of eight polyethylene spheres （PS） with embedded aHe proportional counters. To validate its spectrometric capability, spectrum measurement of an 241Am-Be neutron source was carried out and is described. The Monte Carlo code Geant4 was used to calculate the response functions, taking this interference into consideration. Finally, the neutron spectrum was unfolded in the energy range from 10-9 MeV to 20 MeV. The unfolded spectrum has remarkable consistency with the ISO 8529-1 standard 2alAm-Be neutron spectrum which is a preliminary demonstration that this BSS is reliable and practical.
ISSN:1674-1137
0254-3052
DOI:10.1088/1674-1137/39/8/086001