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Damping of lower hybrid waves in large spectral gap configurations

机译：大频谱间隙配置中较低杂波的阻尼

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Extensive experimental data support reliable power deposition and current drive by lower-hybrid (LH) waves in conditions where a large spectral gap exists between the nominal parallel index of refraction prescribed by the antenna characteristics and phasing, and that required for significant Landau damping to take place. We argue that only a significant modification of the initial spectrum at the plasma edge could explain experimental observations. Based on this assumption, a new prescription for reliable simulations of LH current drive using ray-tracing and Fokker-Planck modelling is proposed. A remarkable agreement between experimental observations in the Tore Supra tokamak and simulations is obtained for relevant parametric scans, including electron density and LH waveguide phasing. In an effort to investigate the possible role of fluctuations, it is shown that the spectral gap can be bridged dynamically in the presence of a fluctuating LH spectrum. (C) 2014 AIP Publishing LLC.
机译：大量的实验数据支持在天线特性和相位规定的标称平行折射率与明显的Landau阻尼所需要的标称平行折射率之间存在较大频谱间隙的情况下，通过低杂波（LH）波进行可靠的功率沉积和电流驱动地点。我们认为只有对等离子体边缘处的初始光谱进行重大修改才能解释实验观察。基于此假设，提出了使用光线跟踪和Fokker-Planck建模对LH电流驱动进行可靠仿真的新方法。对于相关的参数化扫描，包括电子密度和LH波导定相，在Tore Supra托卡马克实验观察和模拟之间获得了显着的一致性。为了研究波动的可能作用，研究表明，在存在波动的LH频谱的情况下，可以动态地弥合光谱间隙。 （C）2014 AIP Publishing LLC。

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