Impact of core electron temperature on current profile broadening with radiofrequency wave heating and current drive in EAST  

作　　者：Jiayuan ZHANG Jinping QIAN Xianzu GONG Bin ZHANG Muquan WU Miaohui LI Jiale CHEN Qing ZANG Shiyao LIN Yan CHAO Hailin ZHAO Ruirong LIANG Tianqi JIA Yunchan HU 张家源;钱金平;龚先祖;张斌;吴木泉;李妙辉;陈佳乐;臧庆;林士耀;晁燕;赵海林;梁瑞荣;贾天琦;胡云禅(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China;University of Science and Technology of China,Hefei 230026,People's Republic of China;Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People's Republic of China)

机构地区：[1]Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China [2]University of Science and Technology of China,Hefei 230026,People's Republic of China [3]Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第10期23-29,共7页等离子体科学和技术（英文版）

基　　金：supported by the National MCF Energy R&D Program of China (No. 2019YFE0304000);National Natural Science Foundation of China (Nos. 12005262 and 11975274);the Anhui Provincial Natural Science Foundation (No. 2108085J06);the Users with Excellence Program of Hefei Science Center CAS (Nos. 2021HSC-UE018 and 2020HSC-UE011);the External Cooperation Program of Chinese Academy of Sciences (No. 116134KYSB20180035);the Science Foundation of Institute of Plasma Physics, Chinese Academy of Sciences (No. DSJJ-2021-04)

摘　　要：In recent EAST experiments,current profile broadening characterized by reduced internal inductance has been achieved by utilizing radio-frequency current drives(RFCD).In contrast to previous density scan experiments,which showed an outward shift of the current density profile of lower hybrid current drive(LHCD)in higher plasma density,the core electron temperature(T_(e)(0))is found to affect the LHCD current profile as well.According to equilibrium reconstruction,a significant increase in on-axis safety factor(q0)from 2.05 to 3.41 is observed by careful arrangement of RFCD.Simulations using ray-tracing code GENRAY and Fokker–Planck code CQL3D have been performed to thoroughly analyze the LHCD current profile,revealing the sensitivity of the LHCD current profile to T_(e)(0).The LHCD current density tends to accumulate in the plasma core with higher current drive efficiency benefiting from higher T_(e)(0).With a lower T_(e)(0),the LHCD current profile broadens due to off-axis deposition of power density.The sensitivity of the power deposition and current profile of LHCD to T_(e)(0)provides a promising way to effectively optimize current profile via control of the core electron temperature.

关 键 词：current profile broadening equilibrium reconstruction core electron temperature lower hybrid wave 

分 类 号：TL631.24[核科学技术—核技术及应用]