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Role of the lower hybrid spectrum in the current drive modeling for DEMO scenarios

机译：用于演示场景的电流驱动模型中的较低混合谱的作用

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摘要

The active control of the radial current density profile is one of the major issues of thermonuclear fusion energy research based on magnetic confinement. The lower hybrid current drive could in principle be used as an efficient tool. However, previous understanding considered the electron temperature envisaged in a reactor at the plasma periphery too large to allow penetration of the coupled radio frequency (RF) power due to strong Landau damping. In this work, we present new numerical results based on quasilinear theory, showing that the injection of power spectra with different n(//) widths of the main lobe produce an RF-driven current density profile spanning most of the outer radial half of the plasma (n(//) is the refractive index in a parallel direction to the confinement magnetic field). Plasma kinetic profiles envisaged for the DEMO reactor are used as references. We demonstrate the robustness of the modeling results concerning the key role of the spectral width in determining the lower hybrid-driven current density profile. Scans of plasma parameters are extensively carried out with the aim of excluding the possibility that any artefact of the utilised numerical modeling would produce any novelty. We neglect here the parasitic effect of spectral broadening produced by linear scattering due to plasma density fluctuations, which mainly occurs for low magnetic field devices. This effect will be analyzed in other work that completes the report on the present breakthrough.
机译：径向电流密度谱的主动控制是基于磁监禁的热核融合能源研究的主要问题之一。原则上可以用作较低的混合电流驱动器作为有效的工具。然而，先前的理解认为在等离子体周边的反应器中设想的电子温度过大，以允许由于强烈的Landau阻尼而渗透耦合的射频（RF）功率。在这项工作中，我们提出了基于Quasilinear理论的新数值结果，表明，具有不同N（//）宽度的功率谱的注射产生了跨越大部分外径径向一半的RF驱动电流密度剖面等离子体（n（//）是与限制磁场的平行方向的折射率）。设想用于演示反应器的等离子体动力学曲线用作参考文献。我们展示了关于频谱宽度在确定较低的混合驱动电流密度分布中的关键作用的建模结果的鲁棒性。广泛地进行等离子体参数的扫描，目的是排除所使用的数值模型的任何人工制造的可能性会产生任何新奇的可能性。在这里，我们忽略了由于等离子体密度波动引起的线性散射产生的光谱展宽的寄生效应，其主要发生用于低磁场装置。在完成关于当前突破的报告的其他工作中将分析这种效果。

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