• 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 >Radio frequency emissions driven by energetic ions from neutral beam in KSTAR low confinement mode plasma
【24h】

Radio frequency emissions driven by energetic ions from neutral beam in KSTAR low confinement mode plasma

机译：通过中性光束在KSTAR低限制模式等离子体中由能量离子驱动的射频排放

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

The tangential neutral beam injection in KSTAR low confinement mode plasma is rapidly accompanied by the electromagnetic emissions in radio frequency (RF) range (0.1-1 GHz). The RF emission is initially onset within 1 ms from the beam injection, at discrete frequencies with steadily increasing intensity. The frequency spacing for these discrete emission lines corresponds to the deuteron cyclotron frequency, at a location midway between the magnetic axis and the edge. Further, the observed discrete frequencies lie in the lower hybrid frequency (f(LH)) range in a broad region on the low field side (LFS). As the initial RF emission becomes saturated, there is another onset of intense RF bursts occurring at discrete frequencies, broadening the emission frequency range further, either at higher or lower frequencies. In some cases, the time interval of the intense RF bursts at the dominant frequency is comparable with the toroidal rotation period at the radial location where f(LH) similar to dominant frequency. The rapid rise and saturation of RF emission intensity in a broad frequency range indicate that a small population of fast ions is sufficient for the growth of energetic particle driven instabilities on the LFS. The multiple onsets in RF emission and the intense RF burst repetition frequency comparable with toroidal rotation frequency indicate the possibility that reorganization in the anisotropic fast ion population results in localized growth of the above instabilities. A gradual decay of RF emission intensity over few tens of milliseconds indicate that enhanced population of fast ions has damping effect on these instabilities.
机译：KSTAR低限制模式等离子体中的切向中性光束注射速率快速伴随着射频（RF）范围（0.1-1GHz）的电磁排放。在具有稳定增加强度的离散频率下，RF发射最初从光束注射开始在1毫秒内发出。用于这些离散发射线的频率间距对应于氘的回旋频，在磁轴和边缘之间的位置处。此外，观察到的离散频率位于低场侧（LFS）上的宽区域中的较低混合频率（F（LH））范围。随着初始RF发射变饱和，存在在离散频率下发生的强烈RF突发的另一个发作，进一步展现发光频率范围，频率更高或更低。在某些情况下，主导频率的强度RF突发的时间间隔与径向位置处的环形旋转时段相当，其中F（LH）类似于显性频率。宽频率范围内的RF发射强度的快速上升和饱和表明，小于人群的快速离子足以在LFS上的能量粒子驱动稳定性的生长。 RF发射中的多个持续性和与环形旋转频率相当的强烈的RF突发重复频率表明在各向异性的快速离子群中重组的可能性导致上述局部稳定性的局部增长。 RF发射强度超过几十毫秒的逐渐衰减表明，增强的快速离子群体对这些不稳定性的影响效果。

著录项

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