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Effects of edge collisionality on ELM characteristics in the grassy ELM regime

机译:边缘碰撞对草木ELM机制中ELM特性的影响

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摘要

Effects of the edge collisionality on ELM characteristics have been investigated in the grassy ELM regime on JT-60U. Both in the high and low q regions (q_(95) > 6 and q_(95) ~ 4.3), ELM amplitude becomes higher at high edge collisionality (density). This collisionality dependence is opposite to the dependence observed in the type I ELM regime, where the ELM amplitude decreases with increasing edge collisionality. The stability analysis suggests that the grassy ELM at q_(95) ~ 4.3 can be triggered by the infinite-n ballooning mode localized inside the pedestal, when peeling-ballooning modes are stable. In the case of higher collisionality, peeling-ballooning modes can also be unstable, and as a result a larger ELM can be triggered. Since both stability boundaries for infinite-n ballooning mode and peeling-ballooning modes are located near the operational point, a small change in the pedestal condition such as a local pressure gradient and/or a bootstrap current can determine the most unstable mode. This mechanism is considered as a possible candidate for the appearance of a mixture ELM of grassy ELMs and large ELMs.
机译:在JT-60U的草地ELM方案中,已经研究了边缘碰撞性对ELM特性的影响。在高和低q区域(q_(95)> 6和q_(95)〜4.3)中,ELM振幅在高边缘碰撞性(密度)下都变高。这种碰撞性依赖性与在I型ELM方案中观察到的依赖性相反,后者的ELM振幅随着边缘碰撞性的增加而减小。稳定性分析表明,当剥离气球模式稳定时,q_(95)〜4.3处的草状ELM可以由位于基座内部的无限n气球模式触发。在较高的碰撞性的情况下,剥离-膨胀模式也可能不稳定,因此可以触发更大的ELM。由于无限n膨胀模式和剥离膨胀模式的稳定性边界都位于操作点附近,因此基座条件的微小变化(例如局部压力梯度和/或自举电流)可以确定最不稳定的模式。该机制被认为是出现草质ELM和大型ELM的混合ELM的可能候选者。

著录项

  • 来源
    《Nuclear fusion》 |2010年第6期|P.16.1-16.10|共10页
  • 作者单位

    Japan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnEFDA-CSU Culham, Culham Science Centre, UK;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, Japan;

    rnJapan Atomic Energy Agency, 801-1 Muko-yama, Naka, Ibaraki 311-0193, 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

    tokamaks, spherical tokamaks; magnetohydrodynamics (including electron magnetohydrodynamics); ideal and resistive MHD modes; kinetic modes;

    机译:托卡马克;球形托卡马克;磁流体动力学(包括电子磁流体动力学);理想和电阻MHD模式;动力学模式;

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