Gyrokinetic theory of turbulent acceleration and momentum conservation in tokamak plasmas

Lu WANG (王璐); Shuitao PENG (彭水涛); P H DIAMOND

doi:10.1088/2058-6272/aab5bc

Plasma Science and Technology > 2018 > 20(7): 74004-074004. > DOI: 10.1088/2058-6272/aab5bc

Lu WANG (王璐), Shuitao PENG (彭水涛), P H DIAMOND. Gyrokinetic theory of turbulent acceleration and momentum conservation in tokamak plasmas[J]. Plasma Science and Technology, 2018, 20(7): 74004-074004. DOI: 10.1088/2058-6272/aab5bc

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Gyrokinetic theory of turbulent acceleration and momentum conservation in tokamak plasmas

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
²Center 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

Funds: These works are supported by National Natural Science Foundation of China (NSFC) under Contract Nos. 11675059 and 11305071, and the Ministry of Science and Technology of China under Contract No. 2013GB112002.

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Received Date: January 06, 2018

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Abstract

Abstract

Understanding the generation of intrinsic 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 ITG 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.
- turbulent acceleration,
- intrinsic rotation,
- momentum conservation

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References (30)

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