Study of turbulence in the high β P discharge using only RF heating on EAST

Zheng S Y; Zhang D B; Xue E BYu L MZhang X MHuang JXiao YWu M QGong X Z

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Study of turbulence in the high β P discharge using only RF heating on EAST

机译：Study of turbulence in the high β P discharge using only RF heating on EAST

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Abstract High poloidal beta scenarios with a favorable energy confinement ( βp∼1.9 , H98y2∼1.4) have been achieved on the Experimental Advanced Superconducting Tokamak using only radio frequency wave heating. Gyrokinetic simulations are carried out with experimental plasma parameters and tokamak equilibrium data of a typical high βp discharge using the gyrokinetic toroidal code. Linear simulations show that electron-temperature scale length and electron-density scale length destabilize the turbulence, collision effects stabilize the turbulence, and the instability propagates in the electron diamagnetic direction. These properties indicate that the dominant instability in the core of high βp plasma is a collisionless trapped electron mode. Ion thermal diffusivity, calculated by nonlinear gyrokinetic simulations, is consistent with the experimental value, in which the electron collision effects play an important role. Further analyses show that instabilities with kθρs>0.38 are suppressed by collision effects and collision effects reduce the radial correlation length of turbulence, resulting in the suppression of the turbulence.

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来源
《Plasma physics and controlled fusion》 |2022年第4期|共11页
作者
Zheng S Y; Zhang D B; Xue E BYu L MZhang X MHuang JXiao YWu M QGong X Z;
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作者单位

East China University of Science and Technology;

Institute of Plasma Physics, Chinese Academy of science;

Institute for Fusion Theory and Simulation, Zhejiang UniversityAdvanced Energy Research Center, Shenzhen University;

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正文语种英语
中图分类等离子体物理学;
关键词
high poloidal beta; gyrokinetic simulation; turbulence; transport;

Study of turbulence in the high β P discharge using only RF heating on EAST

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