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Effect of resonant magnetic perturbations on low collisionality discharges in MAST and a comparison with ASDEX Upgrade

机译:共振磁扰动对MAST中低碰撞放电的影响以及与ASDEX升级的比较

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摘要

Sustained edge localized mode (ELM) mitigation has been achieved on MAST and AUG using resonant magnetic perturbations (RMPs) with various toroidal mode numbers over a wide range of low to medium collisionality discharges. The ELM energy loss and peak heat loads at the divertor targets have been reduced. The ELM mitigation phase is typically associated with a drop in plasma density and overall stored energy. In one particular scenario on MAST, by carefully adjusting the fuelling it has been possible to counteract the drop in density and to produce plasmas with mitigated ELMs, reduced peak divertor heat flux and with minimal degradation in pedestal height and confined energy. While the applied resonant magnetic perturbation field (b_(res)~r) can be a good indicator for the onset of ELM mitigation on MAST and AUG there are some cases where this is not the case and which clearly emphasize the need to take into account the plasma response to the applied perturbations. The plasma response calculations show that the increase in ELM frequency is correlated with the size of the edge peeling-tearing like response of the plasma and the distortions of the plasma boundary in the X-point region. In many cases the RMPs act to increase the frequency of type Ⅰ ELMs, however, there are examples where the type Ⅰ ELMs are suppressed and there is a transition to a small or type Ⅳ ELM-ing regime.
机译:在MAST和AUG上,使用共振磁扰动(RMP)在宽范围的中低碰撞放电范围内具有各种环形模式编号,可以实现持续边缘局部模式(ELM)的缓解。在分流器目标处的ELM能量损失和峰值热负荷已降低。 ELM缓解阶段通常与血浆密度和总存储能量下降有关。在MAST上的一种特定情况下,通过仔细调整燃料供应,可以抵消密度的下降并产生具有降低的ELM,降低的峰值偏滤器热通量以及最小的基座高度降级和受限能量的等离子体。虽然施加的共振磁扰动场(b_(res)〜r)可以很好地指示MAST和AUG上ELM缓解的开始,但在某些情况下并非如此,并且清楚地强调了需要考虑的因素等离子体对所施加扰动的响应。等离子体响应计算表明,ELM频率的增加与边缘剥离撕裂的大小(如等离子体响应)以及X点区域中等离子体边界的变形相关。在许多情况下,RMP起到增加Ⅰ型ELM频率的作用,但是,有一些例子可以抑制Ⅰ型ELM,并且过渡到小型或Ⅳ型ELM-ing机制。

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  • 来源
    《Nuclear fusion》 |2015年第4期|043011.1-043011.15|共15页
  • 作者单位

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    Institute of Plasma Physics AS CR v.v.i., IPP.CR, Prague, Czech Republic;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Max-Planck Institut fuer Plasmaphysik, Wendelsteinstr, Greifswald, Germany;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Institute of Plasma Physics AS CR v.v.i., IPP.CR, Prague, Czech Republic;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

    CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;

    Max-Planck Institut fuer Plasmaphysik, Garching, Germany;

  • 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

    ELM mitigation; ELM energy loss; MAST; AUG;

    机译:ELM缓解;ELM能量损失;桅杆;八月;
  • 入库时间 2022-08-18 00:42:32

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