Simulation of runaway electron generation and diffusion during major disruptions in the HL-2A tokamak |
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| Affiliation: | 1. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;2. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China;1. Open Joint-Stock Company “N.A. Dollezhall Research and Development Institute of Power Engineering”, (OJSC “NIKIET”), 107140, Malaya Krasnoselskaya 2/8, Moscow, Russian Federation;2. D.V. Efremov Scientific Research Institute of Electrophysical Apparatus, 196641 St. Petersburg, Russian Federation;1. Graduate School of Science, Shizuoka University, Shizuoka, Japan;2. National Institute for Fusion Science, Gifu, Japan;3. Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka, Japan;4. Graduate School of Engineering, Hokkaido University, Sapporo, Japan;5. Department of Material Science, Shimane University, Matsue, Shimane, Japan;6. Hydrogen Isotope Research Center, University of Toyama, Toyama, Japan;1. National Fusion Research Institute, Daejeon, Republic of Korea;2. Korea Atomic Energy Research Institute, Daejeon, Republic of Korea;1. Karlsruhe Institute of Technology (KIT), Institute for Neutron Physics and Reactor Technology (INR), Germany;2. Karlsruhe Institute of Technology (KIT), Institute for Applied Materials (IAM-WPT), Germany;3. Indian Institute of Technology Madras (IITM), Department of Mechanical Engineering, India;1. Korea Atomic Energy Research Institute, Republic of Korea;2. National Fusion Research Institute, Republic of Korea |
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| Abstract: | The generation and diffusion of runaway electrons (REs) during major disruptions in the HL-2A tokamak has been studied numerically. The diffusion caused by the magnetic perturbation is especially addressed. The simulation results show that the strong magnetic perturbation (δB/B ～ 1.0 × 10?3) can cause a significant loss of REs due to the radial diffusion and restrain the RE avalanche effectively. The results also indicate that the REs are generated initially in the plasma core during disruptions, and that the toroidal electric field does not exhibit a centrally hollow phenomenon. In addition, it is found that the toroidal effects have little impact on the generation of RE and the evolution of toroidal electric field. |
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| Keywords: | Runaway electrons Runaway electron current Magnetic perturbation Toroidal effect |
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