First neutron spectrometry measurement at the HL-2A Tokamak

YUAN Xi; ZHANG Xing; XIE Xu-Fei; CHEN Zhong-Jing; PENG Xing-Yu; FAN Tie-Shuan; CHEN Jin-Xiang; LI Xiang-Qing; YUAN Guo-Liang; YANG Qing-Wei; YANG Jin-Wei

doi:10.1088/1674-1137/37/12/126001

Chinese Physics C> 2013, Vol. 37> Issue(12) : 126001 DOI: 10.1088/1674-1137/37/12/126001

First neutron spectrometry measurement at the HL-2A Tokamak

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Abstract：
A compact neutron spectrometer based on the liquid scintillator is presented for neutron energy spectrum measurements at the HL-2A Tokamak. The spectrometer was well characterized and a fast digital pulse shape discrimination software was developed using the charge comparison method. A digitizer data acquisition system with a maximum frequency of 1 MHz can work under an environment with a high count rate at HL-2A Tokamak. Specific radiation and magnetic shielding for the spectrometer were designed for the neutron spectrum measurement at the HL-2A Tokamak. For pulse height spectrum analysis, dedicated numerical simulation utilizing NUBEAM combined with GENESIS was performed to obtain the neutron energy spectrum. Subsequently, the transportation process from the plasma to the detector was evaluated with Monte Carlo calculations. The distorted neutron energy spectrum was folded with the response matrix of the liquid scintillation spectrometer, and good consistency was found between the simulated and measured pulse height spectra. This neutron spectrometer based on a digital acquisition system could be well adopted for the investigation of the auxiliary heating behavior and the fast-ion related phenomenon on different tokamak devices.

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YUAN Xi, ZHANG Xing, XIE Xu-Fei, CHEN Zhong-Jing, PENG Xing-Yu, FAN Tie-Shuan, CHEN Jin-Xiang, LI Xiang-Qing, YUAN Guo-Liang, YANG Qing-Wei and YANG Jin-Wei. First neutron spectrometry measurement at the HL-2A Tokamak[J]. Chinese Physics C, 2013, 37(12): 126001. doi: 10.1088/1674-1137/37/12/126001

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Received: 2013-04-11
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沈阳化工大学材料科学与工程学院沈阳 110142

First neutron spectrometry measurement at the HL-2A Tokamak

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First neutron spectrometry measurement at the HL-2A Tokamak

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