Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres

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CAO Jing, JIANG Chun-Yu, CAO Hong-Rui and YIN Ze-Jie. Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres[J]. Chinese Physics C, 2015, 39(8): 086001. doi: 10.1088/1674-1137/39/8/086001
CAO Jing, JIANG Chun-Yu, CAO Hong-Rui and YIN Ze-Jie. Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres[J]. Chinese Physics C, 2015, 39(8): 086001.  doi: 10.1088/1674-1137/39/8/086001 shu
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Received: 2014-08-26
Revised: 1900-01-01
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Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres

    Corresponding author: CAO Jing,
    Corresponding author: YIN Ze-Jie,

Abstract: 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 3He 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 241Am-Be neutron spectrum which is a preliminary demonstration that this BSS is reliable and practical.

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