Experimental validation of a Tokamak neutron spectrometer based on Bonner spheres

• 作 者: 曹靖 蒋春雨 曹宏睿 阴泽杰
• 机 构: State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of
• 出 处: Chinese Physics C
• 发表日期: 2015年08期
• 关键词: neutron spheres spectrometer polyethylene demonstration preliminary validate con

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 embedded3 He proportional counters.To validate its spectrometric capability, spectrum measurement of an241Am-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 from10-9MeV to 20 MeV.The unfolded spectrum has remarkable consistency with the ISO 8529-1 standard241Am-Be neutron spectrum which is a preliminary demonstration that this BSS is reliable and practical.

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 embedded3H proportional counters.To validate its spectrometric capability, spectrum measurement of an241Am-Be neutron source was carried out and is described. Monte Carlo code Geant4 was used to calculate the response functions, taking this interference into consideration. Finaally, 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.