Dynamic Formation of Plasma Rotation in a Tokamak

托卡马克中等离子体旋转的动态形成

• 批准号: 11480113
• 负责人: UESUGI Yoshihiko
• 金额: $ 7.74万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11480113/
• 关键词: Plasma Rotation; Electrode Biasing; Electric Field Shear; E × B Plasma Rotation; Rotating Helical Magnetic Field; Dynamic Ergodic Divertor; IGBT Inverter Power Supply; Fast Feedback Control; IGBTインバータ電源; アルフヴェン共鳴; 磁気島; ディジタルフィードバック制御; EXBシアーフロ

This research has been carried out to study (1) the dynamic formation process of the plasma rotation, (2) the relation between the plasma rotation and the sheared electric structure and (3) the formation process of the plasma rotation by the rotating helical magnetic field. So far, the following results has been obtained ;Fast response IGBT power supplies for Joule and vertical field coils have been installed in HYBTOK-II tokamak in order to produce target tokamak plasmas with good reproducibility. By the digital feedback control of the plasma horizontal position with a digital signal processor, flexible operation of the plasma current can be done very effectively, such as AC tokamak operation, rapid current rise and so on.Helical coils with m=6/n=1 as a main mode has been installed in HYBTOK-II and characteristics of the induced rotating helical field(RHF) in the present helical coil system were studied. When the direction of the helical field rotation is same as that of the plasma E × B rotation, the relative velocity decreases and the intensity of RHF is enhanced due to redistribution of the plasma current by island formation. When they are opposite, the intensity of RHF is remarkably dumped by the generation of the shielding current at the resonance layer.The electrode biasing is applied to modify the plasma rotation. In the preliminary experiment it is found that the modification of the plasma rotation by electrode biasing strongly affects the penetration of RHF and the dynamic relaxation of the RHF intensity has been observed just after the turn of the biasing.

本研究主要研究：(1)等离子体旋转的动态形成过程；(2)等离子体旋转与剪切电结构的关系；(3)旋转螺旋磁场作用下等离子体旋转的形成过程。到目前为止，得到了以下结果：在HYBTOK-II托卡马克中安装了用于焦耳和垂直场线圈的快速响应IGBT电源，以产生具有良好再现性的目标托卡马克等离子体。利用数字信号处理器对等离子体水平位置进行数字反馈控制，可以非常有效地实现对等离子体电流的灵活操作，如交流托卡马克操作、电流快速上升等。在HYBTOK-II中安装了以m=6/n=1为主要模式的螺旋线圈，研究了螺旋线圈系统中感应旋转螺旋场（RHF）的特性。当螺旋场旋转方向与等离子体E × B旋转方向相同时，由于等离子体电流的岛状重新分布，相对速度降低，RHF强度增强。当它们相反时，谐振层屏蔽电流的产生显著地倾倒了RHF的强度。利用电极偏置来改变等离子体的旋转。在初步实验中发现，电极偏置对等离子体旋转的改变强烈地影响了RHF的穿透，并且在偏置转变后观察到RHF强度的动态松弛。

项目成果

菊池祐介, 小島寛樹, 谷山智則, 豊田光洋, 上杉喜彦, 高村秀一: "動的エルゴディックダイバータ実験に用いる局所ヘリカルコイル系の特性評価"電気学会論文誌A. 121-A・3. 249-255 (2001)

Yusuke Kikuchi、Hiroki Kojima、Tomonori Taniyama、Mitsuhiro Toyota、Yoshihiko Uesugi、Shuichi Takamura：“动态遍历分流器实验中使用的局部螺旋线圈系统的特性评估”日本电气工程师学会会刊 A. 121-A・3。 249-255 (2001)

菊池祐介,小島寛樹,谷田智則,豊田光洋,上杉喜彦,高村秀一: "動的エルゴディックダイバータ実験に用いる局所へリカルコイル系の特性評価"電気学会論文誌. 120-A(印刷中). (2001)

Yusuke Kikuchi、Hiroki Kojima、Tomonori Tanida、Mitsuhiro Toyota、Yoshihiko Uesugi、Shuichi Takamura：“用于动态遍历分流器实验的局部螺旋线圈系统的特性评估”日本电气工程师学会会刊 120-A（出版中）。 （2001）

M Toyoda, T. Taniyama, Y. Kikuchi, Y. Uesugi, S.Takamura: "Improvement of the Plasma Control by IGBT Invertor Power Supplies in HYBTOK-II Tokamak"Proc. 25 th Int. Conf. on Phenomena in Ionized Gases, Nagoya. Vol. 3. 191-192 (2001)

M Toyoda、T. Taniyama、Y. Kikuchi、Y. Uesugi、S.Takamura：“HYBTOK-II 托卡马克中 IGBT 逆变器电源对等离子控制的改进”Proc。

Y. Kikuchi, V. P. Budaev, Y. Uesugi, M. Toyoda, S. Takamura: "Dynamic Behaviors of Tokamak Plasma Induced by Externally Rotating Helical Magnetic Field"to be presented in 29 th EPS Conference, Montreux, Switzerland. (2002)

Y. Kikuchi、V. P. Budaev、Y. Uesugi、M. Toyoda、S. Takamura：“外部旋转螺旋磁场诱导的托卡马克等离子体的动态行为”将于瑞士蒙特勒举行的第 29 届 EPS 会议上发表。

Y. Kikuchi, H. Kojima, T. Taniyama M. Toyoda, Y. Uesugi, S. Takamura: "Characteristics of Local Helical Coil System for Dynamic Ergodic Divertor"Electrical Engineering in Japan. Vol. 139. 16-23 (2002)

Y. Kikuchi、H. Kojima、T. Taniyama M. Toyoda、Y. Uesugi、S. Takamura：“动态遍历偏滤器局部螺旋线圈系统的特性”日本电气工程。