Zhang Xing, Yuan Xi, Xie Xufei, Chen Zhongjing, Peng Xingyu, Chen Jinxiang, Zhang Guohui, Li Xiangqing, Fan Tieshuan, Zhong Guoqiang, Hu Liqun, Wan Baonian
School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Chengfu Road 201, 100871 Beijing, China.
Rev Sci Instrum. 2013 Mar;84(3):033506. doi: 10.1063/1.4797623.
A new compact stilbene crystal neutron spectrometer has been investigated and applied in the neutron emission spectroscopy on the EAST tokamak. A new components analysis method is presented to study the anisotropic light output in the stilbene crystal detector. A Geant4 code was developed to simulate the neutron responses in the spectrometer. Based on both the optimal light output function and the fitted pulse height resolution function, a reliable neutron response matrix was obtained by Geant4 simulations and validated by 2.5 MeV and 14 MeV neutron measurements at a 4.5 MV Van de Graaff accelerator. The spectrometer was used to diagnose the ion temperature in plasma discharges with lower hybrid wave injection and ion cyclotron resonance heating on the EAST tokamak.
