Gyrokinetic theory of turbulent acceleration and momentum conservation in tokamak plasmas  

作　　者：Lu WANG Shuitao PENG P H DIAMOND 王璐;彭水涛;P H DIAMOND(International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,People＇s Republic of China;Center for Momentum Transport and Flow Organization and Center for Astrophysics and Space Sciences,University of California at San Diego,La Jolla,CA 92093-0424,United States of America)

机构地区：[1]International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China [2]Center for Momentum Transport and Flow Organization and Center for Astrophysics and Space Sciences, University of California at San Diego, La Jolla, CA 92093-0424, United States of America

出　　处：《Plasma Science and Technology》2018年第7期22-26,共5页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China(NSFC)under Contract Nos.11675059 and 11305071;the Ministry of Science and Technology of China under Contract No.2013GB112002

摘　　要：Understanding the generation of inmnsic rotation in tokamak plasmas is crucial for future fusion reactors such as ITER. We proposed a new mechanism named turbulent acceleration for the origin of the intrinsic parallel rotation based on gyrokinetic theory. The turbulent acceleration acts as a local source or sink of parallel rotation, i.e., volume force, which is different from the divergence of residual stress, i.e., surface force. However, the order of magnitude of turbulent acceleration can be comparable to that of the divergence of residual stress for electrostatic ion temperature gradient （ITG） turbulence. A possible theoretical explanation for the experimental observation of electron cyclotron heating induced decrease of co-current rotation was also proposed via comparison between the turbulent acceleration driven by 1TG turbulence and that driven by collisionless trapped electron mode turbulence. We also extended this theory to electromagnetic ITG turbulence and investigated the electromagnetic effects on intrinsic parallel rotation drive. Finally, we demonstrated that the presence of turbulent acceleration does not conflict with momentum conservation.Understanding the generation of inmnsic rotation in tokamak plasmas is crucial for future fusion reactors such as ITER. We proposed a new mechanism named turbulent acceleration for the origin of the intrinsic parallel rotation based on gyrokinetic theory. The turbulent acceleration acts as a local source or sink of parallel rotation, i.e., volume force, which is different from the divergence of residual stress, i.e., surface force. However, the order of magnitude of turbulent acceleration can be comparable to that of the divergence of residual stress for electrostatic ion temperature gradient （ITG） turbulence. A possible theoretical explanation for the experimental observation of electron cyclotron heating induced decrease of co-current rotation was also proposed via comparison between the turbulent acceleration driven by 1TG turbulence and that driven by collisionless trapped electron mode turbulence. We also extended this theory to electromagnetic ITG turbulence and investigated the electromagnetic effects on intrinsic parallel rotation drive. Finally, we demonstrated that the presence of turbulent acceleration does not conflict with momentum conservation.

关 键 词：turbulent acceleration intrinsic rotation momentum conservation 

分 类 号：TL631.24[核科学技术—核技术及应用] O313.2[理学—一般力学与力学基础]