# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2017, Vol. 28 ›› Issue (9): 129

• NUCLEAR ELECTRONICS AND INSTRUMENTATION •

### A study of beryllium moderator thickness for a fission chamber with fast neutron measurements

Wen-Di Wang 1,2  Hong-Rui Cao 1,2  Jing Cao 1,2  Guo-Liang Yuan 3   Ze-Jie Yin 1,2

1. 1 State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
3 Southwestern Institute of Physics, Chengdu 610041, China
• Contact: Wen-Di Wang E-mail:wwdbs@mail.ustc.edu.cn
• Supported by:
This work was supported by the National Natural Science Foundation of China (Nos. 10976028 and 11375195) and the National Magnetic Confinement Fusion Energy Development Research (No. 2013GB104003).
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Wen-Di Wang, Hong-Rui Cao, Jing Cao, Guo-Liang Yuan, Ze-Jie Yin. A study of beryllium moderator thickness for a fission chamber with fast neutron measurements.Nuclear Science and Techniques, 2017, 28(9): 129
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Abstract:

The detection efficiency of the fission chamber (FC) is very important for studying the neutron flux measurement (NFM) system in ITER. In this article, we mainly focus our attention on the influence of the moderator. With the Monte Carlo particle transport simulation tool named Geant4, we make a simulation of FC detection efficiency with different levels of thickness of a beryllium moderator. Two manufactured FCs for ITER-NFM systems are then used to test the parameters and performance. The test results agree well with our simulation.