Thursday, April 11, 2013

1304.2977 (Yuan Xi et al.)

First Neutron Spectrometry Measurement at the HL-2A Tokamak    [PDF]

Yuan Xi, Zhang Xing, Xie Xufei, Chen Zhongjing, Peng Xingyu, Fan Tieshuan, Chen Jinxiang, Li Xiangqing, Yuan Guoliang, Yang Jinwei, Yang Qingwei
A compact neutron spectrometer based on the liquid scintillator is presented for the neutron energy spectrum measurement at the HL-2A tokamak. The spectrometer has been well characterized and a fast digital pulse shape discrimination software has been developed using the charge comparison method. A digitizer data acquisition system with the maximum frequency of 1 MHz can work under the high count rate environment at HL-2A. Specific radiation shielding and magnetic shielding for the spectrometerhas been designed for the neutron spectrum measurement at the HL-2A Tokamak. For the analysis of the pulse height spectrum, dedicated numerical simulation utilizing NUBEAM combining with GENESIS has been made to obtain the neutron energy spectrum, following which the transportation process from the plasma to the detector has been evaluated with Monte Carlo calculations. The distorted neutron energy spectrum has been folded with response matrix of the liquid scintillation spectrometer, and good consistency has been found between the simulated pulse height spectra and the measured ones. This neutron spectrometer based on digital acquisition system could be well adopted for the investigation of the auxiliary heating behavior and the fast ion related phenomenon on the different tokamak devices.
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