Real-time monitoring of the 14-MeV D-T fusion neutron yield is urgently required for the triton burnup study on the Experimental Advanced Superconducting Tokamak(EAST).In this study,we developed an optimal design of a fast-neutron detector based on the scintillating fiber(Sci-Fi)to provide D-T neutron yield through Geant4 simulation.The effect on the detection performance is concerned when changing the number of the Sci-Fis embedded in the probe head,minimum distance between the fibers,length of the fibers,or substrate material of the probe head.The maximum number of scintillation photons generated by the n/y source particles and output by the light guide within an event(event:the entire simulation process for one source particle)was used to quantify the n/y res-olution of the detector as the main basis.And the intrinsic detection efficiency was used as another evaluation crite-rion.The results demonstrate that the optimal design scheme is to use a 5 cm probe head whose substrate material is pure aluminum,in which 463 Sci-Fis with the same length of 5 cm are embedded,and the minimum distance between the centers of the two fibers is 2 mm.The optimized detector exhibits clear directionality in the simulation,which is in line with the expectation and experimental data provided in the literature.This study presents the variation trends of the performance of the Sci-Fi detector when its main parameters change,which is beneficial for the targeted design and optimization of the Sci-Fi detector used in a specific radiation environment.

Wei-Kun Chen;Li-Qun Hu;Guo-Qiang Zhong;Bing Hong;Rui-Jie Zhou;Kai Li;Li Yang

Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Hefei Comprehensive National Science Center,Institute of Energy,Hefei 230031,China;School of Mechanical and Vehicle Engineering,West Anhui University,Luan 237012,China

核技术（英文版）

[1]Wei-Kun Chen;Li-Qun Hu;Guo-Qiang Zhong;Bing Hong;Rui-Jie Zhou;Kai Li;Li Yang-.Optimization study and design of scintillating fiber detector for D-T neutron measurements on EAST with Geant4)[J].核技术（英文版）,2022(11):33-45

triton,burnup,crite,rion

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