...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma and Fusion Research >Linear Gyrokinetic Analyses of ITG Modes and Zonal Flows in LHD with High Ion Temperature
【24h】

Linear Gyrokinetic Analyses of ITG Modes and Zonal Flows in LHD with High Ion Temperature

机译：离子温度高的LHD中ITG模式和带状流的线性动力学分析

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Ion temperature (Ti) gradient modes (ITG modes) and zonal flows for high Ti discharges in the Large Helical Device (LHD) are investigated by linear gyrokinetic Vlasov simulation. In recent LHD experiments, high Ti plasmas are generated by neutral beam injection, and spatial profiles of density fluctuations are measured by phase contrast imaging (PCI) [K. Tanaka et al., Plasma Fusion Res. 5, S2053 (2010)]. The observed fluctuations most likely propagate in the direction of the ion diamagnetic rotation in the plasma frame, and their amplitudes increase with the growth of the temperature gradient. The results show the characteristics of ITG turbulence. To investigate the ITG modes and zonal flows in the experiment, linear gyrokinetic simulations were performed in the corresponding equilibria with different Ti profiles by using the GKV-X code [M. Nunami et al., Plasma Fusion Res. 5, 016 (2010)]. The simulation results predict unstable regions for the ITG modes in radial, wavenumber, and phase velocity spaces, in agreement with the PCI measurements. Thus, the fluctuations observed in the experiment are attributed to ITG instability. The responses of the zonal flows show clear contrasts in different field spectra that depend on the Ti profile and the radial position. In addition to the dependence on the field spectra, the zonal flow residual levels are enhanced by increasing the radial wavenumber as theoretically predicted.
机译：通过线性陀螺动力学Vlasov模拟研究了大型螺旋装置（LHD）中高T i 放电的离子温度（T i ）梯度模式和ITG模式。在最近的LHD实验中，通过中性束注入产生高T i 等离子体，并通过相衬成像（PCI）测量密度波动的空间分布[K.田中（Tanaka）等人，等离子融合研究（Plasma Fusion Res。）。 5，S2053（2010）]。观察到的波动最有可能在等离子框架中沿离子反磁性旋转的方向传播，并且其幅度随着温度梯度的增加而增加。结果显示了ITG湍流的特征。为了研究实验中的ITG模式和纬向流动，使用GKV-X代码[M.]在具有不同T i 轮廓的相应平衡中进行了线性陀螺动力学模拟。 Nunami等，等离子融合研究。 5，016（2010）。仿真结果与PCI测量结果一致，预测了径向，波数和相速度空间中ITG模式的不稳定区域。因此，实验中观察到的波动归因于ITG的不稳定性。在取决于T i 剖面和径向位置的不同场谱中，纬向流的响应显示出明显的对比。除了对场谱的依赖性外，通过增加径向波数也可以提高理论上的预测，从而提高了纬向流残留水平。

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