文献类型：期刊文献

英文题名：Study of turbulence in the high βP discharge using only RF heating on EAST

作者：EAST Team[2];Zheng, S. Y.[1];Zhang, D. B.[1];Xue, E. B.[1];Yu, L. M.[1];Zhang, X. M.[1];Huang, J.[2];Xiao, Y.[3];Wu, M. Q.[4];Gong, X. Z.[2]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China;[3]Zhejiang Univ, Inst Fus Theory & Simulat, Hangzhou 310027, Peoples R China;[4]Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China

年份：2022

卷号：64

期号：4

外文期刊名：PLASMA PHYSICS AND CONTROLLED FUSION

收录：;EI(收录号：20221111783663);WOS:【SCI-EXPANDED(收录号:WOS:000762036500001)】；

基金：This work was supported by the National MCF Energy R&D Program of China under Grant Nos. 2019YFE03060000, 2019YFE03050000 and 2019YFE03020004, National Natural Science Foundation of China (Grant Nos. 11675053, 12005063, and 11875131), Users with Excellence Program of Hefei Science Center CAS, Grant Nos. 2020HSC-UE011 and 2021HSC-UE015, and Anhui Provincial Natural Science Foundation No. 2008085Jo4. Numerical computations were performed on the ShenMa High Performance Computing Cluster in Institute of Plasma Physics, Chinese Academy of Science.

语种：英文

外文关键词：high poloidal beta; gyrokinetic simulation; turbulence; transport

摘要：High poloidal beta scenarios with a favorable energy confinement (beta(p) similar to 1.9, H98(y2) similar to 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 beta(p) 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 beta(p) 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 k(theta)rho(s) > 0.38 are suppressed by collision effects and collision effects reduce the radial correlation length of turbulence, resulting in the suppression of the turbulence.