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Spatio-temporal structure of the edge radial electric field during H-mode in JT-60U

机译:JT-60U H模式下边缘径向电场的时空结构

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摘要

Charge exchange recombination spectroscopy measurements with high spatial and temporal resolution have made the evaluation of the radial electric field (E_r) in the JT-60U tokamak peripheral region possible with a better signal-to-noise ratio. In a very low density (< 1 × 10~(19) m~(-3)) L-mode phase, the gradient in E_r (or, equivalently, in poloidal rotation, V_θ) was found to start increasing prior to an increase in the ion temperature (71). As the E_r values in the region r/a > 0.94 started to become negative, down to - 40kVm~(-1) (similar to V_φ), the steepening of the T_i profile in the same region accelerated. Even though the numerical value of V_φ was considerably smaller than that of V_θ, its contribution to shear could be significant: while for r/a≥0.90 V_φ became increasingly negative; it simultaneously became increasingly positive for r/a < 0.90. Clean bifurcations in the edge E_r values between weak negative and strong negative ones were observed in the later ELM-free H-mode phase, with essentially the same confinement properties corresponding to two very different E x B shearing rates. The 'normal' ELMy H-mode took place only after the bifurcations. The results indicate that energy confinement improvement may not necessarily be connected toE×B shear suppression of turbulence.
机译:具有高空间和时间分辨率的电荷交换复合光谱测量结果使得对JT-60U托卡马克外围区域中的径向电场(E_r)的评估成为可能,并且具有更好的信噪比。在非常低的密度(<1×10〜(19)m〜(-3))L模式相中,发现E_r(或等效地,在极向旋转中,V_θ)的梯度在增加之前就开始增加。在离子温度(71)中。随着区域r / a> 0.94中的E_r值开始变为负值,下降到-40kVm〜(-1)(类似于V_φ),在相同区域中T_i曲线的陡峭化加速了。尽管V_φ的数值比V_θ的数值小得多,但它对剪切的贡献可能很大:而当r /a≥0.90时,V_φ变得越来越负。同时,当r / a <0.90时,它变得越来越积极。在较晚的无ELM H模式相中,观察到在弱负负和强负负之间的边缘E_r值中的干净分叉,基本上具有相同的约束特性,对应于两个非常不同的E x B剪切速率。仅在分叉之后才发生“正常” ELMy H模式。结果表明,能量约束的改善可能不一定与湍流的E×B剪切抑制有关。

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  • 来源
    《Nuclear fusion》 |2011年第5期|p.95-103|共9页
  • 作者单位

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    Japan Atomic Energy Agency (JAEA), Naka, Ibaraki-ken 311-0193, Japan;

    National Institute for Fusion Science (NIFS), Toki, Gifu 509-5292, Japan;

    Department of Applied Physics, Helsinki University of Technology, Assn Euratom Tekes,PO Box 4100, 02015 TKK, Finland;

  • 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);
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  • 正文语种 eng
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