...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nuclear fusion >Observation of a quasi-coherent high-frequency electromagnetic mode at the pedestal region in EAST RF-dominant H-modes
【24h】

Observation of a quasi-coherent high-frequency electromagnetic mode at the pedestal region in EAST RF-dominant H-modes

机译：在EAST RF主导H模式的基座区域观察准相干高频电磁模式

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A quasi-coherent high-frequency mode (HFM), with frequency ～300 kHz, has been observed in EAST H-modes obtained by lower hybrid current drive or combined heating of lower hybrid wave and ion cyclotron resonance frequency wave after lithium wall conditioning. The HFM with an initial growing phase in frequency and amplitude appears both following L-H transition and between edge-localized modes at a relatively high-collisionality v~*_e. Detailed analysis from edge Langmuir probe has revealed that the HFM propagates in the electron diamagnetic direction in both the lab frame and the plasma frame. The decorrelation rate of HFM is smaller than the maximum E × B shearing rate at the steep gradient region by an order of magnitude. Furthermore, the growth, saturation and oscillations of HFM, including both frequency and amplitude, are strongly correlated with the evolution of pressure gradient. Thus, the limit-cycle-like oscillations between the amplitude and the frequency of HFM may play an important role in the formation and saturation of pedestal. During the saturation phase of pedestal pressure gradient, the HFM, sometimes accompanied by a mid-frequency (～80 kHz) quasi-coherent mode, drives strong cross-field transport resulting in small crashes of pressure gradient and finally limits the pressure gradient.
机译：在通过壁电流调节后的较低混合电流驱动或较低混合波和离子回旋共振频率波的组合加热获得的EAST H模式中，已观察到频率为〜300 kHz的准相干高频模式（HFM）。在L-H跃迁之后以及在边缘定位模式之间以相对较高的碰撞度v〜* _e出现具有初始频率和幅度增长阶段的HFM。边缘Langmuir探针的详细分析显示，HFM在实验室框架和等离子体框架中都沿电子反磁方向传播。 HFM的去相关速率比陡峭梯度区域的最大E×B剪切速率小一个数量级。此外，HFM的增长，饱和和振荡（包括频率和幅度）都与压力梯度的变化密切相关。因此，HFM的振幅和频率之间的类似极限循环的振荡可能在基座的形成和饱和中起重要作用。在基座压力梯度的饱和阶段，HFM有时会伴随着中频（〜80 kHz）准相干模式，从而驱动强大的跨场传输，从而导致压力梯度的小崩溃，并最终限制了压力梯度。

著录项

  • 来源
    《Nuclear fusion》 |2014年第4期|043014.1-043014.12|共12页
  • 作者

    H.Q. Wang; G.S. Xu; H.Y. Guo; B.N. Wan; N. Yan; S.Y. Ding; R. Chen; W. Zhang; L. Wang; S.C. Liu; L.M. Shao; L. Chen; Y.L. Liu; Y.L. Li; G.H. Hu; N. Zhao;

  • 作者单位

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China,Tri Alpha Energy, Inc., PO Box 7010, Rancho Santa Margarita, CA 92688, USA;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;

    Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    tokamak; quasi-coherent mode; pedestal pressure gradient; high collisionality;

    机译：托卡马克准相干模式基座压力梯度高碰撞性;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号