论文标题
多尺度较低混合电流驱动模拟中的湍流宽阔
Spectral broadening from turbulence in multiscale lower hybrid current drive simulations
论文作者
论文摘要
研究了由于刮擦层（SOL）丝引起的下部杂种（LH）波的散射。据显示，散射可以解释LH光谱差距，而无需对波光谱进行任何临时修改。这是使用多尺度仿真方法显示的，该方法首次允许在射线追踪/fokker-Planck计算中包含全波散射物理。在这种方法中，计算了与细丝的统计集合相互作用的波浪散射概率。这些概率使用辐射转移（RT）理论耦合到射线追踪方程。这允许沿整个射线对象的散射建模，这在多通度方案中可能很重要。对抗碱基C模型中的较低杂交电流驱动器（LHCD）进行了仿真，从而与实验电流和硬X射线（HXR）轮廓非常吻合。鉴定出细丝参数空间中的区域，其中散射对LHCD的影响饱和。这种状态与实验性LHCD测量相吻合，表明饱和确实发生在C模型中，因此细丝的确切统计特性并不重要。
The scattering of lower hybrid (LH) waves due to scrape-off layer (SOL) filaments is investigated. It is revealed that scattering can account for the LH spectral gap without any ad hoc modification to the wave-spectrum. This is shown using a multiscale simulation approach which allows, for the first time, the inclusion of full-wave scattering physics in ray-tracing/Fokker-Planck calculations. In this approach, full-wave scattering probabilities are calculated for a wave interacting with a statistical ensemble of filaments. These probabilities are coupled to ray-tracing equations using radiative transfer (RT) theory. This allows the modeling of scattering along the entire ray-trajectory, which can be important in the multi-pass regime. Simulations are conducted for lower hybrid current drive (LHCD) in Alcator C-Mod, resulting in excellent agreement with experimental current and hard X-ray (HXR) profiles. A region in filament parameter space is identified in which the impact of scattering on LHCD is saturated. Such a state coincides with experimental LHCD measurements, suggesting saturation indeed occurs in C-Mod, and therefore the exact statistical properties of the filaments are not important.
