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首页> 外文期刊>Nuclear fusion >High density physics in reversed field pinches: comparison with tokamaks and stellarators
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High density physics in reversed field pinches: comparison with tokamaks and stellarators

机译：反向场收缩中的高密度物理学：与托卡马克和恒星器的比较

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摘要

Reversed field pinches (RFPs) share with tokamaks and stellarators the experimental evidence of an upper limit for the maximum value of the electron density at which they can operate. Above a certain density level, well described by the Greenwald law for tokamaks and RFPs, a radiative collapse with strong plasma cooling is observed, predominantly due to processes occurring at the plasma boundary. In the RFX-mod RFP close to the density limit a radiating belt, poloidally symmetric and toroidally localized, develops in the region where the plasma is shrunk as an effect of the m = 0 tearing modes. The phenomenology recalls that of MARFES or plasma detachment, though, unlike tokamaks, the appearance of the radiating belt is associated with a soft landing of the plasma discharge.rnThe paper reports the experimental pattern of the RFX-mod plasmas close to the density limit, including density and radiation profiles, plasma flow and turbulence. Particles are toroidally conveyed towards the region of maximum shrinking of the plasma column where they accumulate. The interpretation is related to the topology of MHD m = 0 and m = 1 modes: the reconstruction of the magnetic topology shows that the highly radiating region corresponds to the presence of peripheral m = 0 magnetic islands well detached from the wall. The emerging indication is that in RFPs a reduction of the m = 0 activity could be a way to overcome the density limit.
机译：反向场夹点（RFP）与托卡马克和恒星共同分享了它们可以工作的电子密度最大值上限的实验证据。在格林瓦德定律对托卡马克和RFP进行了很好的描述后，观察到一定的密度水平时，观察到辐射崩塌并伴随强烈的等离子体冷却，这主要是由于等离子体边界处发生了过程。在接近密度极限的RFX-mod RFP中，由于m = 0的撕裂模式，在等离子收缩的区域中形成了呈极对称和环形局部分布的辐射带。现象学上回想起了MARFES或等离子体脱离现象，尽管与托卡马克不同，辐射带的出现与等离子体放电的软着陆有关。rn本文报道了RFX-mod等离子体接近密度极限的实验模式，包括密度和辐射曲线，等离子流和湍流。粒子被环形输送到等离子柱最大收缩的区域，在该区域累积。这种解释与MHD m = 0和m = 1模式的拓扑有关：磁拓扑的重建表明，高辐射区域对应于外围m = 0完全远离壁的磁岛的存在。新兴的迹象是，在RFP中，降低m = 0的活性可能是克服密度极限的一种方法。

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  • 来源
    《Nuclear fusion》 |2009年第4期|126-134|共9页
  • 作者

    M.E. Puiatti; P. Scarin; G. Spizzo; M. Valisa; M. Agostini; A. Alfier; A. Canton; L. Carraro; E. Gazza; R. Lorenzini; R. Paccagnella; I. Predebon; D. Terranova; D. Bonfiglio; S. Cappello; R. Cavazzana; S. Dal Bello; P. Innocente; L. Marrelli; R. Piovan; P. Piovesan; F. Sattin; P. Zanca;

  • 作者单位

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

    Consorzio RFX, Associazione Euratom-ENEA Sulla Fusione. Padova, Italy;

  • 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

    stellarators; torsatrons; heliacs; bumpy tori; and other toroidal confinement devices; transport properties;

    机译：恒星旋风加速器直升机颠簸的花托和其他环形限制装置;运输性质;

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