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Dependence of EC-Driven Current on the EC-Wave Beam Direction in LHD

机译:LHD中EC驱动电流对EC波束方向的依赖性

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Electron cyclotron current drive (ECCD) experiments were conducted in the Large Helical Device to investigate the characteristics of EC-driven current and its profile and the possibility of controlling current and rotational transform profiles by ECCD. Successful ECCD helps prevent magnetohydrodynamic instabilities in plasmas. Scanning the EC-wave beam direction with a long pulse width of 8 s revealed a systematic change in the plasma current. The current's direction was reversed by a reversal of the beam direction. The direction agrees with the prediction of Fisch-Boozer theory regarding EC-wave beam injection from low-field side. The maximum driven current is 9 kA with an EC-wave power of 100 kW. The optimum beam direction that maximizes the driven current is investigated with the help of ray-tracing code. This direction depends on the magnetic field, efficiency of power absorption, and fraction of the power absorbed by trapped electrons.
机译:在大型螺旋装置中进行了电子回旋电流驱动(ECCD)实验,以研究EC驱动电流的特性及其轮廓,以及通过ECCD控制电流和旋转变换轮廓的可能性。成功的ECCD有助于防止等离子体中的磁流体动力学不稳定性。以8 s的长脉冲宽度扫描EC光束方向显示出等离子体电流的系统变化。电流的方向通过光束方向的反转而反转。该方向与关于从低场侧注入EC波束的Fisch-Boozer理论的预测一致。最大驱动电流为9 kA,EC波功率为100 kW。借助光线跟踪代码,可以研究使驱动电流最大化的最佳光束方向。该方向取决于磁场,功率吸收效率以及被捕获的电子吸收的功率分数。

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