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Divertor power load studies for attached L-mode single-null plasmas in TCV

机译：TCV中附加L模式单空等离子体的分流器功率负载研究

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摘要

This paper investigates the power loads at the inner and outer divertor targets of attached, Ohmic L-mode, deuterium plasmas in the TCV tokamak, in various experimental situations using an Infrared thermography system. The study comprises variations of the outer divertor leg length and target flux expansion, the plasma current and a reversal of the magnetic field direction. The direct impact of the divertor magnetic geometry on scrape-off layer (SOL) transport-parameterised by the SOL power fall-off length λ_(q.u) the divertor spreading factor S_u and the in-out power asymmetry-is reported for constant core properties. The in-out power asymmetry increases, either with the divertor leg length, or the target flux expansion. The SOL width λ_(q.u) scales positively with divertor leg length, with a strength that depends on the field direction and differs between the inner and outer divertor. This implies a parametric dependence of λ_(q.u) that is not explicitly included in current multi-machine scaling laws. The divertor spreading factor at the target 5 = S_uf_x, where f_x is the target flux expansion, appears unaffected by changes in the divertor geometry and in the plasma current, is independent of the magnetic field direction and is similar between inner and outer divertor. Possible interpretations of these observations using an ad-hoc analytical purely conductive model for the SOL, by ion drifts or by asymmetric turbulent cross-field transport in the divertor are presented. The observed values of λ_(q.u) are related to existing L-mode and H-mode scaling laws and to similar studies in other tokamaks. Finally, potential implications of these findings for future larger fusion machines are discussed.
机译：本文使用红外热成像系统研究了在各种实验情况下TCV托卡马克中附着的Ohmic L型氘等离子体的内，外偏滤器目标的功率负载。该研究包括外偏滤器支脚长度和目标通量膨胀，等离子体电流和磁场方向反转的变化。对于恒定的堆芯性能，报告了偏滤器磁几何形状对刮除层（SOL）的直接影响，该刮除层由SOL功率下降长度λ_（qu），偏滤器扩散因子S_u和进出功率不对称性参数化。输入输出功率的不对称性随偏滤器支腿的长度或目标通量的增加而增加。 SOL宽度λ_（q.u）与分流器支腿长度成正比，其强度取决于磁场方向，并且内外分流器之间存在差异。这意味着当前多机定标定律未明确包含λ_（q.u）的参数依赖性。在目标5 = S_uf_x处的扩散器扩散因子，其中f_x是目标通量膨胀，看起来不受扩散器几何形状和等离子体电流的变化的影响，与磁场方向无关，在内外扩散器之间类似。提出了使用SOL的临时分析纯导电模型，通过离子漂移或通过偏滤器中不对称湍流交叉场传输对这些观测值的可能解释。 λ_（q.u）的观测值与现有的L模式和H模式缩放定律以及其他托卡马克中的类似研究有关。最后，讨论了这些发现对未来大型融合机的潜在影响。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016052.1-016052.15|共15页
  • 作者

    R. Maurizio; S. Elmore; N. Fedorczak; A. Gallo; H. Reimerdes; B. Labit; C. Theiler; C.K. Tsui; W.A.J. Vijvers;

  • 作者单位

    Ecole Polytechnique Federate de Lausanne (EPFL), Swiss Plasma Center (SPC), 1015 Lausanne, Switzerland;

    CCFE, Culham Science Centre, OX 14 3DB Abingdon, United Kingdom;

    CEA Cadarache, IRFM, F-13108 Saint-Paul-Lez-Durance, France;

    CEA Cadarache, IRFM, F-13108 Saint-Paul-Lez-Durance, France;

    Ecole Polytechnique Federate de Lausanne (EPFL), Swiss Plasma Center (SPC), 1015 Lausanne, Switzerland;

    Ecole Polytechnique Federate de Lausanne (EPFL), Swiss Plasma Center (SPC), 1015 Lausanne, Switzerland;

    Ecole Polytechnique Federate de Lausanne (EPFL), Swiss Plasma Center (SPC), 1015 Lausanne, Switzerland;

    Ecole Polytechnique Federate de Lausanne (EPFL), Swiss Plasma Center (SPC), 1015 Lausanne, Switzerland,University of California San Diego (UCSD), San Diego, CA, United States of America;

    Dutch Institute for Fundamental Energy Research (DIFFER), 5612 AJ Eindhoven, Netherlands;

  • 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

    TCV; SOL width; divertor spreading factor; in-out power asymmetry; infrared thermography; single-null divertor; asymmetric turbulent transport;

    机译：TCV;SOL宽度偏滤器扩散因子;进出功率不对称;红外热成像单零偏滤器;非对称湍流;

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