Geant4 simulation of fast-electron bremsstrahlung imaging at the HL-3 tokamak  

作　　者：Shi-Kui Cheng Yi-Po Zhang Yue-Jiang Shi Jie Zhang Shuai Guan Hong-Bing Xu Qiu-Lei Yang 

机构地区：[1]College of Science,Chongqing University of Technology,Chongqing 400054,China [2]Chongqing Key Laboratory of New Energy Storage Materials and Devices,Chongqing 400054,China [3]Southwestern Institute of Physics,Chengdu 610041,China [4]Hebei Key Laboratory of Compact Fusion,Langfang 065001,China [5]ENN Science and Technology Development Co.,Ltd.,Langfang 065001,China

出　　处：《Nuclear Science and Techniques》2024年第9期213-229,共17页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.12305239);Scientific Research Foundation of Chongqing University of Technology(No.2023ZDZ053);National Key R&D Program of China(No.2019YFE03010001).

摘　　要：To further research on high-parameter plasma,we plan to develop a two-dimensional hard X-ray(HXR)imaging system at the HL-3 tokamak to measure HXRs with energies ranging from 20 to 300 keV.The application of an array-structured detector ensures that this system can measure HXR-radiation spectra from the entire plasma cross section.Therefore,it is suitable for the study of fast-electron physics,such as radio-frequency wave current drives,fast electrons driving instabilities,and plasma disruptions in fusion research.In this study,we develop a simulation for calculating fast-electron bremsstrahlung in the HL-3 tokamak based on the Monte Carlo simulation code Geant4,in which the plasma geometry and forward scattering of fast-electron bremsstrahlung are considered.The preliminary calculation results indicate that the HXR energy deposi-tion on the detector is symmetrically distributed,even though the plasma distribution is asymmetric owing to the toroidal effect.These simulation results are helpful in constructing the relationship between the energy deposition on the detector and parameter distribution on the plasma cross section during HL-3 experiments.This is beneficial for the reconstruction of the fast-electron-distribution function and for optimizing the design of the HXR-imaging system.

关 键 词：GEANT4 SIMULATION HL-3 TOKAMAK Fast-electron bremsstrahlung Hard X-ray imaging 

分 类 号：TL631.24[核科学技术—核技术及应用]