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

IF 3.6 1区 物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Science and Techniques Pub Date : 2024-09-03 DOI:10.1007/s41365-024-01505-2
Shi-Kui Cheng, Yi-Po Zhang, Yue-Jiang Shi, Jie Zhang, Shuai Guan, Hong-Bing Xu, Qiu-Lei Yang
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Abstract

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 deposition 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.

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Geant4 模拟 HL-3 托卡马克的快电子轫致辐射成像
为了进一步研究高参数等离子体,我们计划在 HL-3 托卡马克开发一个二维硬 X 射线(HXR)成像系统,以测量能量范围为 20 至 300 千伏的 HXR。阵列结构探测器的应用确保该系统能够测量整个等离子体截面的 HXR 辐射谱。因此,它适用于研究快电子物理学,如射频波电流驱动、快电子驱动不稳定性和聚变研究中的等离子体破坏。在本研究中,我们基于蒙特卡罗模拟代码 Geant4 开发了一种模拟计算方法,用于计算 HL-3 托卡马克中的快电子轫致辐射,其中考虑了等离子体的几何形状和快电子轫致辐射的正向散射。初步计算结果表明,尽管等离子体的分布由于环状效应而不对称,但探测器上的 HXR 能量沉积是对称分布的。这些模拟结果有助于构建 HL-3 实验期间探测器上的能量沉积与等离子体截面参数分布之间的关系。这有利于重建快速电子分布函数和优化 HXR 成像系统的设计。
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来源期刊
Nuclear Science and Techniques
Nuclear Science and Techniques 物理-核科学技术
CiteScore
5.10
自引率
39.30%
发文量
141
审稿时长
5 months
期刊介绍: Nuclear Science and Techniques (NST) reports scientific findings, technical advances and important results in the fields of nuclear science and techniques. The aim of this periodical is to stimulate cross-fertilization of knowledge among scientists and engineers working in the fields of nuclear research. Scope covers the following subjects: • Synchrotron radiation applications, beamline technology; • Accelerator, ray technology and applications; • Nuclear chemistry, radiochemistry, radiopharmaceuticals, nuclear medicine; • Nuclear electronics and instrumentation; • Nuclear physics and interdisciplinary research; • Nuclear energy science and engineering.
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