| 东方超环上低杂波驱动等离子体环向旋转实验研究 |
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| 引用本文： | 杨进,陈俊,王福地,李颖颖,吕波,向东,尹相辉,张洪明,符佳,刘海庆,臧庆,储宇奇,刘建文,王勋禺,宾斌,何梁,万顺宽,龚学余,叶民友.东方超环上低杂波驱动等离子体环向旋转实验研究[J].物理学报,2020(5):126-132. |
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| 作者姓名： | 杨进 陈俊 王福地 李颖颖 吕波 向东 尹相辉 张洪明 符佳 刘海庆 臧庆 储宇奇 刘建文 王勋禺 宾斌 何梁 万顺宽 龚学余 叶民友 |
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| 作者单位： | 南华大学核科学技术学院;中国科学院等离子体物理研究所;中国科学技术大学工程与应用物理系;南华大学电气工程学院 |
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| 基金项目： | 国家重点研发计划(批准号:2017YFE0301300);安徽省自然科学杰出青年基金(批准号:1908085J01);中国科学院合肥大科学中心重点研发项目(批准号:2017HSC-KPRD002)和中国科学院科研装备研制项目(批准号:YJKYYQ20180013)资助的课题~~ |
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| 摘 要： | 旋转和旋转剪切能抑制磁流体不稳定性和增强等离子体约束.低杂波电流驱动作为未来聚变堆上可能的旋转驱动手段,探索低杂波在现有托卡马克装置上驱动等离子体旋转的驱动机制,可以为未来的聚变堆上旋转预测提供重要参考.在东方超环托卡马克装置上,早期发现了2.45 GHz的低杂波能有效驱动等离子体旋转的现象,认为是边界旋转的改变导致芯部旋转的同电流方向的增加造成的.更高频率下4.6 GHz低杂波电流驱动可以更有效地驱动同电流方向的等离子体旋转.本论文分析在欧姆背景等离子体下,不同功率的低杂波对等离子体环向旋转的影响,研究安全因子剖面变化对环向旋转的关系,利用功率调制获得了低杂波驱动旋转实验中的环向动量输运系数变化情况,发现环向动量扩散系数(χφ)、环向动量箍缩系数(Vpinch)的数值大小趋势是从芯部向靠外的区域逐渐变大.这与低杂波驱动环向旋转时,环向旋转速度由靠外的区域向芯部传递的特性吻合.
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| 关 键 词： | 低杂波电流驱动 环向旋转速度 安全因子 环向动量输运 |
Experimental investigation of lower hybrid current drive induced plasma rotation on the experimental advanced superconducting tokamak |
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| Yang Jin,Chen Jun,Wang Fu-Di,Li Ying-Ying,Lyu Bo,Xiang Dong,Yin Xiang-Hui,Zhang Hong-Ming,Fu Jia,Liu Hai-Qing,Zang Qing,Chu Yu-Qi,Liu Jian-Wen,Wang Xun-Yu,Bin Bin,He Liang,Wan Shun-Kuan,Gong Xue-Yu,Ye Min-You.Experimental investigation of lower hybrid current drive induced plasma rotation on the experimental advanced superconducting tokamak[J].Acta Physica Sinica,2020(5):126-132. |
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| Authors: | Yang Jin Chen Jun Wang Fu-Di Li Ying-Ying Lyu Bo Xiang Dong Yin Xiang-Hui Zhang Hong-Ming Fu Jia Liu Hai-Qing Zang Qing Chu Yu-Qi Liu Jian-Wen Wang Xun-Yu Bin Bin He Liang Wan Shun-Kuan Gong Xue-Yu Ye Min-You |
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| Affiliation: | (School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;Department of Engineering and Applied Physics,University of Science and Technology of China,Hefei 230026,China;School of Electrical Engineering,University of South China,Hengyang 421001,China) |
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| Abstract: | Rotation and its shear can reduce the magnetohydrodynamic instabilities and enhance the confinement.The LHCD has been proposed as a possible means of rotation driving on a future fusion reactor. Exploring the mechanisms of LHCD rotation driving on the current tokamaks can provide important reference for future reactors. On EAST, it was previously shown that 2.45 GHz LHCD can drive plasma toroidal rotation and the change of edge plasma rotation leads the co-current core rotation to increase. At higher frequency, 4.6 GHz lower hybrid wave can more effectively drive co-current plasma toroidal rotation. On EAST, at the lower current, the effects of different LHCD power on plasma toroidal rotation are analyzed. Higher power LHCD has a better driving efficiency. The effect of safety factor(q) profile on toroidal rotation is also presented. The LHCD can change the profile of safety factor due to current drive. It is found that when the power exceeds 1.4 MW, the q profile remains unchanged and the rotation changes only very slightly with LHCD power,suggesting that the current profile is closely related to rotation. In order to further analyze the dynamic process of plasma toroidal rotation driven by lower hybrid current drive on EAST, the toroidal momentum transport due to LHCD is deduced by using the modulated LHCD power injection. Based on the momentum balance equation, the toroidal momentum diffusion coefficient(χφ) and the toroidal momentum pinch coefficient(Vpinch)are obtained by the method of separation of variables and Fourier analysis for the region where the external momentum source can be ignored. It is found that the momentum diffusion coefficient(χφ) and momentum pinch coefficient(Vpinch) tend to increase from the core to the outer region. This is consistent with the characteristic that the toroidal rotation velocity first changes in the outer region and then propagates to the core when the toroidal rotation is driven by LHCD. |
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| Keywords: | lower hybrid current drive toroidal rotation velocity safety factor toroidal momentum transport |
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