Gyrokinetic simulations of nonlinear interactions between magnetic islands and microturbulence  

作　　者：Kaisheng FANG Jian BAO Zhihong LIN 方凯生;包健;林志宏(Fusion Simulation Center,Peking University,Beijing 100871,People’s Republic of China;Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,People’s Republic of China;University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China;Department of Physics and Astronomy,University of California,Irvine,CA 92697,United States of America)

机构地区：[1]Fusion Simulation Center,Peking University,Beijing 100871,People’s Republic of China [2]Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,People’s Republic of China [3]University of Chinese Academy of Sciences,Beijing 100049,People’s Republic of China [4]Department of Physics and Astronomy,University of California,Irvine,CA 92697,United States of America

出　　处：《Plasma Science and Technology》2019年第11期7-16,共10页等离子体科学和技术（英文版）

基　　金：supported by the China National Magnetic Confinement Fusion Science Program (Grant No. 2018YFE0304100);the US Department of Energy, Office of Science, Office of Advanced Scientific Computing Research and Office of Fusion Energy Sciences, Scientific Discovery through Advanced Computing (Sci DAC) program under Award Number DE-SC0018270 (Sci DAC ISEP Center);the China Scholarship Council (Grant No. 201306010032);resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory (DOE Contract No. DE-AC05-00OR22725);the National Energy Research Scientific Computing Center (DOE Contract No. DE-AC02-05CH11231)

摘　　要：A conservative scheme of kinetic electrons for gyrokinetic simulations in the presence of magnetic islands has been implemented and verified in the gyrokinetic toroidal code, where zonal and nonzonal components of all perturbed quantities are solved together. Using this new conservative scheme, linear simulation of kinetic ballooning mode has been successfully benchmarked with the electromagnetic hybrid model. Simulations of nonlinear interactions between magnetic islands and the ion temperature gradient(ITG) mode in a tokamak show that the islands rotate at the electron diamagnetic drift velocity. The linear ITG structure shifts from the island O-point toward the X-point due to the pressure flattening effect inside the islands, and the nonlinear ITG structure peaks along the magnetic island separatrix because of the increased pressure gradient there.A conservative scheme of kinetic electrons for gyrokinetic simulations in the presence of magnetic islands has been implemented and verified in the gyrokinetic toroidal code, where zonal and nonzonal components of all perturbed quantities are solved together. Using this new conservative scheme, linear simulation of kinetic ballooning mode has been successfully benchmarked with the electromagnetic hybrid model. Simulations of nonlinear interactions between magnetic islands and the ion temperature gradient(ITG) mode in a tokamak show that the islands rotate at the electron diamagnetic drift velocity. The linear ITG structure shifts from the island O-point toward the X-point due to the pressure flattening effect inside the islands, and the nonlinear ITG structure peaks along the magnetic island separatrix because of the increased pressure gradient there.

关 键 词：GYROKINETIC simulations MAGNETIC ISLANDS MICROTURBULENCE 

分 类 号：TL6[核科学技术—核技术及应用]