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3D vacuum magnetic field modelling of the ITER ELM control coil during standard operating scenarios

机译：ITER ELM控制线圈在标准操作场景下的3D真空磁场建模

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In-vessel, non-axisymmetric, control coils have proven to be an important option for mitigating and suppressing edge-localized modes (ELMs) in high performance operating regimes on a growing number of tokamaks. Additionally, an in-vessel non-axisymmetric ELM control coil is being considered in the ITER baseline design. In preparing for the initial operation of this coil set, a comprehensive study was carried out to characterize the linear superposition of the 3D vacuum magnetic field, produced by the ELM coil, on a series of equilibria representing nine standard ITER operating scenarios. Here, the spatial phase angle of toroidally distributed currents, specified with a cosine waveform, in the upper and lower rows of the ITER ELM coil (IEC) set is varied in 2° steps while holding the current in the equatorial row of coils constant. The peak current in each of the three toroidal rows of window-frame coils making up the IEC is scanned between 5 kAt and 90 kAt in 5 kAt steps and the width of the edge region covered by overlapping vacuum field magnetic islands is calculated. This width is compared to a vacuum field ELM suppression correlation criterion found in DⅢ-D. A minimum coil current satisfying the DⅢ-D criterion, along with an associated set of phase angles, is identified for each ITER operating scenario. These currents range from 20 kAt to 75 kAt depending on the operating scenario being used and the toroidal mode number (n) of the cosine waveform. Comparisons between the scaling of the divertor footprint area in cases with n - 3 perturbation fields versus those with n = 4 show significant advantages when using n = 3. In addition, it is found that the DⅢ-D correlation criterion can be satisfied in the event that various combinations of individual IEC window-frame coils need to be turned off due to malfunctioning components located inside the vacuum vessel. Details of these results for both the full set of 27 window-frame coils and various reduced sets, using either n = 3 and n = 4 perturbation fields, are discussed.
机译：事实证明，在越来越多的托卡马克上，高性能，高性能的运行方式中，船内非轴对称控制线圈是缓解和抑制边缘定位模式（ELM）的重要选择。另外，在ITER基线设计中正在考虑采用船内非轴对称ELM控制线圈。在准备此线圈组的初始操作时，进行了全面的研究，以表征由ELM线圈产生的3D真空磁场的线性叠加，该线性叠加表示了9种标准ITER操作场景的一系列平衡。在此，ITER ELM线圈（IEC）组的上排和下排中以余弦波形指定的环形分布电流的空间相角以2°步长变化，同时使赤道线圈中的电流保持恒定。在5 kAt和90 kAt之间以5 kAt的步长扫描构成IEC的三个环形环形窗框线圈中的每一个的峰值电流，并计算出重叠的真空场磁岛所覆盖的边缘区域的宽度。将该宽度与DⅢ-D中发现的真空场ELM抑制相关标准进行比较。对于每个ITER操作场景，确定满足DⅢ-D标准的最小线圈电流以及一组相关的相角。这些电流范围从20 kAt到75 kAt，这取决于所使用的工作方案和余弦波形的环形模式编号（n）。当使用n = 3时，在n-3个扰动场与n = 4扰动场的情况下，偏滤器足迹区域的缩放比例比较显示出明显的优势。此外，发现在D-3-D相关标准可以满足如果真空容器内部的组件发生故障，则需要关闭各个IEC窗框线圈的各种组合，以防万一。讨论了使用n = 3和n = 4扰动场的27个窗框线圈组和各种简化集的这些结果的细节。

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  • 来源
    《Nuclear fusion》 |2013年第9期|093029.1-093029.13|共13页
  • 作者

    T.E. Evans; D.M. Orlov; A. Wingen; W. Wu; A. Loarte; T.A. Casper; O. Schmitz; G. Saibene; M.J. Schaffer; E. Daly;

  • 作者单位

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA;

    Oak Ridge National Laboratory, Oak Ridge, TN 37831-8072, USA;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    ITER Organization, Route de Vinon sur Verdon, 13115 St Paul lez Durance, France;

    ITER Organization, Route de Vinon sur Verdon, 13115 St Paul lez Durance, France;

    Forschungszentrum Juelich, IEF-4 Euratom Association, Juelich, Germany;

    Fusion for Energy Joint Undertaking, Barcelona, Spain;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, USA;

    ITER Organization, Route de Vinon sur Verdon, 13115 St Paul lez Durance, France;

  • 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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