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A multi-machine scaling of halo current rotation

机译：光晕电流旋转的多机缩放

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摘要

Halo currents generated during unmitigated tokamak disruptions are known to develop rotating asymmetric features that are of great concern to ITER because they can dynamically amplify the mechanical stresses on the machine. This paper presents a multi-machine analysis of these phenomena. More specifically, data from C-Mod, NSTX, ASDEX Upgrade, DⅢ-D, and JET are used to develop empirical scalings of three key quantities: (1) the machine-specific minimum current quench time, t_(CQ); (2) the halo current rotation duration, T_(rot); and (3) the average halo current rotation frequency, (f_h). These data reveal that the normalized rotation duration, t_(rot)/τ_(CQ), and the average rotation velocity, (v_h), are surprisingly consistent from machine to machine. Furthermore, comparisons between carbon and metal wall machines show that metal walls have minimal impact on the behavior of rotating halo currents. Finally, upon projecting to ITER, the empirical scalings indicate that substantial halo current rotation above (f_h) = 20 Hz is to be expected. More importantly, depending on the projected value of T_(CQ) in ITER, substantial rotation could also occur in the resonant frequency range of 6-20 Hz. As such, the possibility of damaging halo current rotation during unmitigated disruptions in ITER cannot be ruled out.
机译：已知在未缓解的托卡马克中断期间产生的晕电流会形成旋转不对称特征，这是ITER十分关注的，因为它们可以动态放大机器上的机械应力。本文介绍了这些现象的多机器分析。更具体地说，来自C-Mod，NSTX，ASDEX升级，DⅢ-D和JET的数据用于建立三个关键量的经验标度：（1）机器特定的最小电流淬火时间t_（CQ）； （2）晕轮当前旋转持续时间T_（rot）； （3）平均光晕电流旋转频率（f_h）。这些数据表明，标准化的旋转持续时间t_（rot）/τ_（CQ）和平均旋转速度（v_h）令人惊讶地在机器之间保持一致。此外，碳壁机器和金属壁机器之间的比较表明，金属壁对旋转晕电流的行为影响最小。最后，根据ITER经验，比例缩放表明，预期（f_h）= 20 Hz以上的大量光晕电流旋转。更重要的是，根据ITER中T_（CQ）的投影值，在6-20 Hz的谐振频率范围内也可能发生明显的旋转。因此，不能排除在ITE​​R中不受缓解的中断期间损坏光环电流旋转的可能性。

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  • 来源
    《Nuclear fusion》 |2018年第1期|016050.1-016050.15|共15页
  • 作者

    C.E. Myers; N.W. Eidietis; S.N. Gerasimov; S.P. Gerhardt; R.S. Granetz; T.C. Hender; G. Pautasso;

  • 作者单位

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, United States of America;

    General Atomics, San Diego, CA 92186, United States of America;

    CCFE, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom;

    Princeton Plasma Physics Laboratory, Princeton, NJ 08543, United States of America;

    MIT Plasma Science and Fusion Center, Cambridge, MA 02139, United States of America;

    CCFE, Culham Science Centre, Abingdon, OX14 3DB, United Kingdom;

    Max-Planck-Institiit fur Plasmaphysik, 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

    tokamak; disruptions; halo currents;

    机译：托卡马克破坏;晕流;

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