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EBW power deposition and current drive in WEGA—comparison of simulation with experiment

机译：WEGA中的EBW功率沉积和电流驱动-模拟与实验的比较

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摘要

Detailed computational studies of electrostatic electron Bernstein waves (EBWs) propagation in the WEGA stellarator are performed and compared with experimental results. Using the WEGA antenna, the two O-/X-mode radiation lobes are modelled by sets of rays whose intensities are proportional to the measured radiation pattern. After projecting these rays onto the plasma periphery, the O–X-EBW mode conversion efficiency around the upper hybrid resonance is determined from a full wave adaptive mesh solver of the cold plasma equations. From the roots of the electrostatic EBW dispersion re lation,ray tracing is performed to determine the power absorption on the first or second cyclotron harmonic as well as current drive assuming the Fisch–Boozer mechanism. Good agreement is achieved between our EBW simulations on specific WEGA equilibria and the experimental results from the antenna launch of 2.45 GHzwaves. The experimentally observed off-axis power deposition and the outward shift dependence of the absorption maxima on increasing magnetic field can only be explained by the existence of a hot electron component in the WEGA plasma. It is this hot electron component that permits wave absorption at the second harmonic near the plasma boundary. Moreover, the simulations not only reproduce the current density reversal at the plasma centre for low magnetic fields but also the destruction of this current density reversal for larger magnetic fields.
机译：进行了详细的计算研究，研究了WEGA恒星器中静电电子伯恩斯坦波（EBW）的传播并将其与实验结果进行了比较。使用WEGA天线，通过强度与所测量辐射图成比例的多组射线对两个O- / X模式辐射波瓣进行建模。将这些光线投射到等离子体外围之后，围绕上混合共振的O–X-EBW模式转换效率由冷等离子体方程的全波自适应网格求解器确定。从静电EBW色散关系的根源开始，进行射线追踪，以确定第一或第二回旋加速器谐波上的功率吸收以及采用费施-布泽尔机理的电流驱动。我们在特定WEGA平衡上的EBW模拟与2.45 GHz波天线发射的实验结果之间达成了良好的共识。实验观察到的离轴功率沉积以及吸收最大值对增加磁场的向外偏移依赖性只能由WEGA等离子体中存在热电子成分来解释。正是这种热电子成分允许在等离子体边界附近的二次谐波处吸收波。此外，模拟不仅再现了低磁场在等离子体中心的电流密度反转，而且还破坏了较大磁场的电流密度反转的破坏。

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