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Mitigation of MHD induced fast-ion redistribution in MAST and implications for MAST-Upgrade design

机译：减轻MHD引起的MAST中的快速离子重分布及其对MAST升级设计的影响

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摘要

The phenomenon of the redistribution of neutral beam fast ions due to magnetohydrodynamic (MHD) activity in plasma has been observed on many tokamaks and more recently has been a focus of research on MAST (Turnyanskiy et al 2013 Nucl. Fusion 53 053016). n = 1 fishbone modes are observed to cause a large decrease in the neutron emission rate indicating the existence of a significant perturbation of the fast-ion population in the plasma. Theoretical work on fishbone modes states that the fast-ion distribution itself acts as the source of free energy driving the modes that cause the redistribution. Therefore a series of experiments have been carried out on MAST to investigate a range of plasma densities at two neutral-beam power levels to determine the region within this parameter space in which fishbone activity and consequent fast-ion redistribution is suppressed. Analysis of these experiments shows complete suppression of fishbone activity at high densities with increasing activity and fast-ion redistribution at lower densities and higher neutral-beam power, accompanied by strong evidence that the redistribution effect primarily affects a specific region in the plasma core with a weaker effect over a wider region of the plasma. The results also indicate the existence of correlations between gradients in the modelled fast-ion distribution function, the amplitude and growth rate of the fishbone modes, and the magnitude of the redistribution effect. The same analysis has been carried out on models of MAST-Upgrade baseline plasma scenarios to determine whether significant fast-ion redistribution due to fishbone modes is likely to occur in that device. A simple change to the neutral-beam injector geometry is proposed which is shown to have a significant mitigating effect in terms of the fishbone mode drive and is therefore expected to allow effective plasma heating and current drive over a wider range of plasma conditions in MAST-Upgrade.
机译：由于血浆中的磁流体动力学（MHD）活性导致中性束快速离子重新分布的现象已在许多托卡马克中观察到，最近已成为MAST研究的重点（Turnyanskiy等人，2013 Nucl。Fusion 53 053016）。观察到n = 1鱼骨模式会导致中子发射速率大大降低，这表明血浆中快离子种群存在明显的扰动。关于鱼骨模式的理论研究表明，快离子分布本身就是自由能量的来源，驱动了导致重新分布的模式。因此，在MAST上进行了一系列实验，研究了两种中性束功率水平下的一系列等离子体密度，以确定该参数空间内鱼骨活性和随之而来的快速离子再分布受到抑制的区域。对这些实验的分析表明，高密度下鱼骨活性被完全抑制，活性增加，而低密度下和中性束功率更高时，离子快速重新分布，同时有力的证据表明，重新分布作用主要影响等离子体核心中的特定区域。在较宽的等离子体区域上产生较弱的影响。结果还表明，建模的快速离子分布函数中的梯度之间存在相关性，鱼骨模式的幅度和增长率以及重新分布效果的大小也存在相关性。对MAST-Upgrade基线血浆情景模型进行了相同的分析，以确定在该设备中是否可能由于鱼骨模式而导致快速的离子重分布。提出了对中性束喷射器几何形状的简单更改，该更改显示出在鱼骨模式驱动方面具有显着的缓解效果，因此有望在MAST-S的更广泛的等离子体条件下实现有效的等离子体加热和电流驱动升级。

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  • 来源
    《Nuclear fusion》 |2015年第1期|013021.1-013021.16|共16页
  • 作者

    D.L. Keeling; T.R. Barrett; M. Cecconello; C.D. Challis; N. Hawkes; O.M. Jones; I. Klimek; K.G. McClements; A. Meakins; J. Milnes; M. Turnyanskiy;

  • 作者单位

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

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

    Department of Physics and Astronomy, Uppsala University, SE-751 05 Uppsala, Sweden;

    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,Department of Physics, Durham University, South Road, Durham DH1 3LE, UK;

    Department of Physics and Astronomy, Uppsala University, SE-751 05 Uppsala, Sweden;

    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;

    ITER Physics Department, EFDA CSU Garching, Boltzmannstrasse 2, D-85748 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

    neutral-beam injection; MAST; MHD; fast ions;

    机译：中性束注入;桅杆;MHD;快速离子;

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