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ECCD Experiment Using an Upgraded ECH System on LHD

机译：在LHD上使用升级的ECH系统进行ECCD实验

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Electron cyclotron current drive (ECCD) is an attractive tool for controlling plasmas. In the large helical device (LHD), ECCD experiments have been performed by using an EC-wave power source, gyrotron, with a frequency of 84 GHz. The maximum driven current was ～9 kA with 100 kW injection power to plasma and 8s duration of EC-wave pulse. These years, high-power and long-pulse 77 GHz gyrotrons were newly installed. An ECCD experiment with 775 kW injection power was performed. The 77 GHz waves of 8 s pulse duration sustained the plasmas. The EC-wave beam direction was scanned toroidally, keeping the beam direction aiming at the magnetic axis in X-mode polarization. In spite of the change in the EC-wave beam direction, plasma parameters such as the line-average electron density, the central electron temperature and the plasma stored energy were kept nearly the same values for the discharges, ～0.3×1019 m?3, ～3 keV and ～30 kJ, except for the plasma current. The plasma current showed a systematic change with the change in the beam direction for ECCD, and at an optimum direction with N // ～ ?0.3, the plasma current reached its maximum, ～40 kA. Also, current drive efficiency normalized with density and power was improved by 50% compared with that at the former 84 GHz ECCD experiment.
机译：电子回旋电流驱动器（ECCD）是用于控制等离子体的有吸引力的工具。在大型螺旋装置（LHD）中，已经通过使用频率为84 GHz的EC波电源回旋加速器进行了ECCD实验。最大驱动电流为〜9 kA，向等离子体注入功率为100 kW，EC波脉冲持续时间为8 s。这些年来，新安装了高功率和长脉冲的77 GHz回旋管。进行了775 kW注入功率的ECCD实验。脉冲持续时间为8 s的77 GHz波维持了等离子体。环形扫描EC波的束流方向，使束流方向保持在X模式极化中的磁轴方向。尽管EC射线束方向发生了变化，但放电的等离子参数（如线平均电子密度，中心电子温度和等离子存储能量）仍保持几乎相同的值，约为0.3×10 除等离子体电流外，为19 m ？3 ，〜3 keV和〜30 kJ。随着ECCD束流方向的变化，等离子体电流呈现出系统的变化，在N // 〜0.3的最佳方向上，等离子体电流达到最大值，约为40 kA。而且，与以前的84 GHz ECCD实验相比，通过密度和功率归一化的电流驱动效率提高了50％。

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