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Numerical study of alpha particle loss with toroidal field ripple based on CFETR steady-state scenario

Chinese Physics B 2024年第1期33卷 503-510页

作者：李钮琦徐颖峰钟方川张德兵 College of Science Donghua UniversityShanghai 201620China Member of Magnetic Confinement Fusion Research Center Ministry of EducationShanghai 201620China Department of Physics East China University of Science and TechnologyShanghai 200237China

Effects of plasma equilibrium parameters on the alpha particle loss with the toroidal field ripple based on the CFETR steady-state scenario have been numerically investigated by the orbit-following code GYCAVA. It is found that alpha particle losses decrease and loss regions become narrower with the plasma current increasing or with the magnetic field decreasing. It is because the ripple stochastic transport and the ripple well loss of alpha particle are reduced with the safety factor decreasing. Decrease of the plasma density and temperature can reduce alpha particle losses due to enhancement of the slowing-down effect. The direction of the toroidal magnetic field can significantly affect heat loads induced by lost alpha particle. The vertical asymmetry of heat loads induced by the clockwise and counter-clockwise toroidal magnetic fields are due to the fact that the ripple distribution is asymmetric about the mid-plane, which can be explained by the typical orbits of alpha particle. The maximal heat load of alpha particle for the clockwise toroidal magnetic field is much smaller than that for the counter-clockwise one.

关键词： alpha particle loss ripple orbit-following tokamak

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Simulations of energetic alpha particle loss in the presence of toroidal field ripple in the CFETR tokamak

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Plasma Science and Technology 2022年第10期24卷 12-22页

作者： Yingfeng XU Debing ZHANG Jiale CHEN Fangchuan ZHONG College of Science Donghua UniversityShanghai 201620People's Republic of China Member of Magnetic Confinement Fusion Research Centre Ministry of EducationShanghai 201620People's Republic of China Department of Physics East China University of Science and TechnologyShanghai 200237People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

Energetic alpha particle losses with the toroidal field ripple and the Coulomb collision in the CFETR tokamak have been simulated by using the orbit-following code GYCAVA for the steady-state and hybrid *** effects of the outer boundary and the ripple amplitude on alpha particle losses have been *** loss fractions and heat loads of alpha particles in the hybrid scenario are much smaller than those in the steady-state scenario for a significant ripple *** alpha particles in the plasma core are lost due to the ripple stochastic transport for a large ripple amplitude *** heat loads with the last closed flux surface boundary are different from those with the wall boundary for the CFETR tokamak,which can be explained by typical alpha particle *** heat load spots have been observed in alpha particle loss simulations,which is due to the ripple well *** transition of the lost alpha particle behavior from the ripple stochastic diffusion to the ripple well trapping has been identified in our CFETR *** Coulomb collision effect is responsible for this transition.

关键词： CFETR toroidal field ripple orbit-following code alpha particle loss

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