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首页> 外文期刊>Nuclear fusion >Experimental evidence of lower hybrid wave scattering in Alcator C-Mod due to scrape off layer density fluctuations
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Experimental evidence of lower hybrid wave scattering in Alcator C-Mod due to scrape off layer density fluctuations

机译：由于刮擦层密度波动而导致Alcator C-Mod中混合波散射较低的实验证据

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摘要

Novel experimental measurements of the lower hybrid (LH) wave electric field vector, E-LH, obtained in Alcator C-Mod using dynamic Stark spectroscopy are presented. Three key results were obtained by comparison with 3D full-wave COMSOL simulations using the cold plasma dielectric tensor and reflectometry-measured density profiles. (1) As a function of space and LH power, the magnitude of E-LH was found to agree with the full-wave simulation result. (2) The direction of E-LH was found to have a substantial poloidal component and is in strong disagreement with the nearly radial full-wave simulation result. (3) The addition of scrape off layer density fluctuations to the density profile implemented in the full-wave simulations can be used to explain the E-LH direction discrepancy. It is concluded that diffraction and scattering by turbulence-driven scrape off layer density fluctuations is the responsible mechanism behind the modification in the direction of E-LH. These results further support the previously reported proposition that edge turbulence is an important mechanism behind the strong anomalous drop in LH current drive efficiency for diverted plasmas in the high-density regime.
机译：提出了使用动态Stark光谱在Alcator C-Mod中获得的下混合（LH）波电场矢量E-LH的新实验测量结果。通过与使用冷等离子体介电张量和反射法测量的密度分布图的3D全波COMSOL仿真进行比较，获得了三个关键结果。 （1）E-LH的大小与空间和LH功率有关，与全波仿真结果一致。 （2）发现E-LH的方向具有相当多的极向分量，并且与近径向全波模拟结果存在很大的差异。 （3）在全波模拟中将刮除层密度波动添加到密度剖面中可以用来解释E-LH方向差异。得出的结论是，湍流驱动的刮擦层密度波动引起的衍射和散射是E-LH方向修饰背后的负责机制。这些结果进一步支持了先前报道的观点，即边缘湍流是高密度状态下转移等离子体的LH电流驱动效率急剧异常下降背后的重要机制。

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  • 来源
    《Nuclear fusion》 |2019年第7期|076006.1-076006.13|共13页
  • 作者

    Martin E. H.; Lau C.; Wallace G. M.; Shiraiwa S.; Mumgaard R. T.;

  • 作者单位

    Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA;

    Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA;

    MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

    MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

    MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA;

  • 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

    lower hybrid current drive; electric field vector; turbulence;

    机译：下混合电流驱动电场矢量湍流;

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