Optimization of X-mode electron cyclotron current drive in high-electron-temperature plasma in the EAST tokamak

作     者：王瀚林 邹晓岚 王晓洁 Yves PEYSSON 李妙辉 吴陈斌 张超 刘甫坤 Joan DECKER Hanlin WANG;Xiaolan ZOU;Xiaojie WANG;Yves PEYSSON;Miaohui LI;Chenbin WU;Chao ZHANG;Fukun LIU;Joan DECKER

作者机构：Institute of Plasma PhysicsChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of ChinaHefei 230026People's Republic of China CEAInstitute for Magnetic Fusion ResearchSaint-Paul-Lez-Durance F-13108France EPFLSwiss Plasma CenterLausanne 1018Switzerland 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2023年第25卷第2期

页      面：47-57页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

基　　金：the National Key R&D Program of China(Nos.2017YFE0300500 and 2017YFE0300503) the Comprehensive Research Facility for Fusion Technology Program of China(No.2018-000052-73-01-001228) 

主　　题：current drive ECCD efficiency EAST tokamak 

摘      要：A discharge with electron temperature up to 14 keV has been achieved in *** of the electron cyclotron current drive(ECCD)efficiency at high electron temperature under EAST parameters is presented using C3PO/LUKE *** results show that the ECCD efficiency of X-mode increases with central electron temperature up to 10 keV and then starts to decrease above 10 keV,at a specific magnetic field and toroidal *** efficiency degradation is due to the presence of the third harmonic extraordinary(X3)downshifted absorption at the low field side(LFS);even the cold resonance of X3 mode is located outside the *** the electron temperature increases from 5 to 20 ke V,the X3 absorption increases from 0.9%to 96.4%.The trapping electron effect at the LFS produces a reverse Ohkawa *** competition between the Fisch–Boozer current drive and the Ohkawa current drive results in a decrease in ECCD *** efficiency optimization is achieved through two *** is to increase the toroidal angle,leading to X2 mode predominating again over X3 mode and the electron resonance domain of X2 mode moving far from the trapped/passing *** second one is to increase the magnetic field to move away the X3 resonance layer from the plasma,hence less EC power absorbed by X3 mode.