On current drive by Ohkawa mechanism of electron cyclotron wave in large inverse aspect ratio tokamaks
On current drive by Ohkawa mechanism of electron cyclotron wave in large inverse aspect ratio tokamaks
复制标题
大反展弦比托卡马克电子回旋波电流驱动大川机制研究
DOI：
10.1088/1741-4326/aaa338
复制
发表时间：
2018-01
期刊：
影响因子：
3.3
通讯作者：
Deng Sheng
中科院分区：
文献类型：
--
作者：
Zheng Pingwei;Gong Xueyu;Lu Xingqiang;He Lihua;Cao Jingjia;Huang Qianhong;Deng Sheng
利用电子回旋波的Ohkawa机制，提出了一种大反纵横比托卡马克外半区局域化的高效电流驱动方法。在高电子βe HL-2 M类大反纵横比托卡马克和EAST类小反纵横比托卡马克中进一步研究了EC波的离轴Ohkawa电流驱动（OKCD）。OKCD可以被有效地驱动，并且驱动电流分布在空间上局限于径向区域中，范围从0.62到0.85，其中大部分被捕获的电子为OKCD提供了极好的优势。电流驱动效率随着小半径的增大而增大，当小半径超过一定值后，电流驱动效率下降。捕获电子的作用大大增强了OKCD机制的电流驱动能力。在HL-2 M装置中，通过调节控制镜改变环向和极向入射角，最高电流驱动效率可达0.183，OKCD的总驱动电流可达20-32 kA MW−1。由于较低的反纵横比，电流驱动对于类似EAST的场景效率较低。结果表明，OKCD是一种有价值的交流驱动方法，其潜在能力可用于抑制远轴区的一些重要磁流体动力学不稳定性。
A localized and efficient current drive method in the outer-half region of the tokamak with a large inverse aspect ratio is proposed via the Ohkawa mechanism of electron cyclotron (EC) waves. Further off-axis Ohkawa current drive (OKCD) via EC waves was investigated in high electron beta βe HL-2M-like tokamaks with a large inverse aspect ratio, and in EAST-like tokamaks with a low inverse aspect ratio. OKCD can be driven efficiently, and the driven current profile is spatially localized in the radial region, ranging from 0.62 to 0.85, where the large fraction of trapped electrons provides an excellent advantage for OKCD. Furthermore, the current drive efficiency increases with an increase in minor radius, and then drops when the minor radius beyond a certain value. The effect of trapped electrons greatly enhances the current driving capability of the OKCD mechanism. The highest current drive efficiency can reach 0.183 by adjusting the steering mirror to change the toroidal and poloidal incident angle, and the total driven current by OKCD can reach 20–32 kA MW−1 in HL-2M-like tokamaks. The current drive is less efficient for the EAST-like scenario due to the lower inverse aspect ratio. The results show that OKCD may be a valuable alternative current drive method in large inverse aspect ratio tokamaks, and the potential capabilities of OKCD can be used to suppress some important magnetohydrodynamics instabilities in the far off-axis region.
登录
查看更多内容
影响因子：
3.3
作者：
N. Bertelli;D. Lazzari;E. Westerhof
通讯作者：
N. Bertelli;D. Lazzari;E. Westerhof
影响因子：
2.2
作者：
R. Harvey;G. Taylor
通讯作者：
R. Harvey;G. Taylor
影响因子：
8.6
作者：
N. Fisch;A. Boozer
通讯作者：
N. Fisch;A. Boozer
影响因子：
2.2
作者：
B. Dudson;X. Q. Xu;M. V. Umansky;H. Wilson;P. Snyder
通讯作者：
B. Dudson;X. Q. Xu;M. V. Umansky;H. Wilson;P. Snyder
影响因子：
3.3
作者：
Toshihiro Suzuki;S. Ide;K. Hamamatsu;A. Isayama;T. Fujita;C. Petty;Y. Ikeda;K. Kajiwara;O. Naito;M. Seki;S. Moriyama;T. Hatae;T. Kondoh
通讯作者：
Toshihiro Suzuki;S. Ide;K. Hamamatsu;A. Isayama;T. Fujita;C. Petty;Y. Ikeda;K. Kajiwara;O. Naito;M. Seki;S. Moriyama;T. Hatae;T. Kondoh