...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >Small amplitude oscillations before the L-H transition in EAST
【24h】

Small amplitude oscillations before the L-H transition in EAST

机译：在东部L-H过渡之前的小振幅振荡

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

Before L-to H-mode transition small amplitude oscillations (SAOs), different from the widely known intermediate phase (I-phase), at a frequency of a few kilohertz can be observed on EAST. Under sufficient auxiliary heating, SAOs can transit to the H-mode or I-phase. The edge radial electric field (Er) located inside the separatrix can be observed to deepen after bursts of SAOs. In SAOs, the turbulence level preceding the negative radial electric field and floating potential perturbation about 90 degrees in phase, consistent with the model of zonal-flows and turbulence interaction, is measured by the Langmuir probe at the bottom of the edge Er well. A physical mechanism for SAOs is developed: at a critical gradient in pressure and Er, turbulence increases at the inboard edge of the Er well. The increased turbulence level enhances the radial particle, energy and momentum transport at the plasma edge and increases the amplitude of the zonal flow at the bottom of the Er well due to the increased Reynolds force. The increase in the zonal flow amplitude acts to mitigate the turbulence on the inboard edge of the Er well, driving a limit-cycle oscillation. The poloidal magnetic perturbations of the oscillations are poloidal in-out/updown asymmetric and toroidal symmetric in the SAOs.
机译：在L-to H模式过渡之前，从众所周知的中间相（I相）不同，在东部可以观察到几千赫兹的频率。在足够的辅助加热下，Saos可以转动到H模式或I相。位于分离器内部的边缘径向电场（ER）可以观察到在Saos爆发后加深。在Saos中，在负径向电场之前的湍流水平和相位漂浮约90度的浮动电位扰动，与局部底部底部的Langmuir探针相一致地测量。开发了一种用于SAO的物理机制：在压力和ER的临界梯度下，湍流井的湍流增加。增加的湍流水平增强了等离子体边缘处的径向颗粒，能量和动量输送，并且由于增加的雷诺力力，增加了ER底部的区域流动的幅度。区域流动幅度的增加作用以减轻孔的内侧边缘上的湍流，驱动极限循环振荡。振荡的个子磁性扰动是索斯中的针状内外/欠型不对称和环形对称。

著录项

  • 来源
  • 作者

    Shao L. M.; Xu G. S.; Chen R.; Chen L.; Birkenmeier G.; Duan Y. M.; Gao W.; Manz P.; Shi T. H.; Wang H. Q.; Wang L.; Xu M.; Yan N.; Zhang L.;

  • 作者单位

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Southwestern Inst Phys POB 432 Chengdu 610041 Sichuan Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

    Chinese Acad Sci Inst Plasma Phys Hefei 230031 Anhui Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    small amplitude oscillations; Er; turbulence; I-phase;

    机译：小幅度振荡;呃;湍流;I相;

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