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Numerical study of fast ion behavior in the presence of magnetic islands and toroidal field ripple in the EAST tokamak

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Chinese Physics B 2014年第10期23卷 334-341页

作者：张伟胡立群孙有文丁斯晔张子君刘松林 Institute of Plasma Physics Chinese Academy of Sciences

A peculiar first orbit loss type was found apart from the normal ones when we use ORBIT code to simulate fast ion orbits in the EAST tokamak. Fast ion orbits were studied in the presence of toroidal field （TF） ripple and magnetohydro- dynamic （MHD） perturbations. We analyzed the properties of the drifted orbits in detail and compared their differences, finding that the combined effects of ripple and magnetic islands are much greater than the effects of either one of them alone. Then we investigated the orbitdeviations as a function of pitch angle in different radial positions. The modeling results demonstrate that the loss of trapped particles is mainly caused by the ripple, while MHD＇perturbation mainly plays an important role in the passing particles. Furthermore we modeled the loss rate using different equilibriums. Results prove that a higher beta can indeed improve the confinement of fast ions, while a little change in the q profile can make the topologies of magnetic islands become quite different and results in quite different total particle losses.

关键词： fast ion toroidal field ripple magnetic island orbit drift

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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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