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Development of capacitively-coupled combline antennas for current drive in tokamaks

机译：托卡马克中用于电流驱动的电容耦合梳状天线的开发

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摘要

The capacitively-coupled combline (CCC) antenna has been developed for current drive by the lower hybrid wave (LHW) on the TST-2 spherical tokamak. The combline antenna was developed to satisfy the requirements of high directionality, low reflectivity, and simple feeding. Since the combline antenna makes use of mutual coupling between neighboring elements, only the first and the last elements are connected to external feedlines. RF powers and power densities of the order of 100 kW and 1 MW m(-2) can be achieved easily in small antennas of the order of 0.1 m(2). The two CCC antennas installed in TST-2 (outboard-launch and top-launch) excite toroidal refractive index (n(phi)) spectra peaked around five with the frequency of 200 MHz. Wave excitation calculation using a finite element code shows that the excited power of the n(phi) = 5 LHW component increases rapidly when the plasma cutoff density layer (where n(e) = 5 x 10(14) m(-3)) becomes closer than 27 mm from the antenna surface, in agreement with experiment. Experimentally, the density profile in front of the antenna can be controlled by adjusting the side limiter location or antenna-plasma distance, and should be optimized for antenna-plasma coupling, since too high coupling results in a broadened and less directional n(phi) spectrum, and too low coupling results in a less efficient power coupling. Using these antennas, successful ST plasma start-up and I-p ramp-up to over 25 kA (about 1/4 of the nominal I-p for OH operation) have been achieved with RF power of less than 100 kW in about 40 ms.
机译：电容耦合梳状线（CCC）天线已开发用于通过TST-2球形托卡马克上的下部混合波（LHW）进行电流驱动。梳状天线的开发是为了满足高方向性，低反射率和简单馈电的要求。由于梳状天线利用了相邻元件之间的相互耦合，因此只有第一个和最后一个元件才连接到外部馈线。在功率为0.1 m（2）的小型天线中，可以轻松实现100 kW和1 MW m（-2）的RF功率和功率密度。安装在TST-2中的两个CCC天线（外部发射和顶部发射）激发环形折射率（n（phi））频谱，其峰值在5个峰值附近，频率为200 MHz。使用有限元代码进行的波激发计算表明，当等离子体截止密度层（其中n（e）= 5 x 10（14）m（-3））时，n（phi）= 5 LHW分量的激发功率迅速增加。与实验一致，距离天线表面的距离变得小于27 mm。实验上，可以通过调整侧面限制器的位置或天线-等离子体距离来控制天线前的密度分布，并且应针对天线-等离子体耦合进行优化，因为太高的耦合会导致n（phi）变宽且方向性降低频谱，太低的耦合会导致功率耦合效率降低。使用这些天线，成功实现了ST等离子体启动和I-p斜升至超过25 kA（对于OH操作，约为I-p标称值的1/4），而RF功率在约40 ms内小于100 kW。

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  • 来源
    《Nuclear fusion》 |2019年第6期|066004.1-066004.7|共7页
  • 作者

    Yajima S.; Takase Y.; Tajiri Y.; Takei Y.; Tsujii N.; Yamazaki H.; Moeller C. P.; Shinya T.;

  • 作者单位

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Univ Tokyo, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1138654, Japan;

    Gen Atom, 3550 Gen Atom Court, San Diego, CA 92121 USA;

    QST Rokkasho Fus Inst, 2-166 Oaza, Rokkasho, Aomori 0393212, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    spherical tokamak; current drive; lower hybrid wave; plasma start-up; RF antenna;

    机译：球形托卡马克;电流驱动;低杂波;等离子体启动;射频天线;

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