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Kink instabilities in high-beta JET advanced scenarios

机译：高Beta JET高级方案中的扭结不稳定性

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摘要

Stability of high-beta plasmas is studied on discharges from a series of JET experiments on steady-state and hybrid advanced scenarios, with a wide range of safety factor (q) profiles and normalized beta values extending to β_N = 4. Bursting and continuous forms of global n = 1 instabilities are encountered that degrade confinement or, in some cases, give rise to disruptions. Mode frequencies are well above the inverse wall time and correspond to plasma rotation at around mid-radius. Stability boundaries in terms of q_(min) and pressure peaking are examined. For relatively broad pressure profiles the stability limit decreases from β_N = 4 at q_(min) = 1 to β_N = 2 at q_(min) = 3, while at fixed q_(min) it decreases with increasing pressure peaking. Metastable and unstable regions are identified in the β_N-q_(min) diagram by mode-trigger analysis. Tearing and kink mode structures are found from phase analysis of temperature profile oscillations; for a selection of kink cases, instability conditions and mode structure are compared with ideal stability calculations.
机译：在稳态和混合高级情景下，通过一系列JET实验的放电研究了高β等离子体的稳定性，其安全系数（q）分布范围广，标准化的beta值扩展至β_N=4。爆裂和连续形式全局n = 1的不稳定性会降低限制度，或者在某些情况下会引起破坏。模式频率远高于倒壁时间，并且对应于中半径附近的等离子体旋转。检查了根据q_（min）和压力峰值的稳定性边界。对于相对较宽的压力曲线，稳定性极限从q_（min）= 1时的β_N= 4降低到q_（min）= 3时的β_N= 2，而在固定q_（min）时，它随着压力峰值的增加而减小。通过模式触发分析，可在β_N-q_（min）图中识别出亚稳态和不稳定区域。从温度分布振荡的相位分析中发现了撕裂和扭结模式结构。为了选择扭结情况，将不稳定性条件和模式结构与理想的稳定性计算进行了比较。

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  • 来源
    《Nuclear fusion》 |2012年第2期|p.023006.1-023006.12|共12页
  • 作者

    P. Buratti; M. Baruzzo; R.J. Buttery; CD. Challis; I.T. Chapman; F. Crisanti; L. Figini; M. Gryaznevich; T.C. Hender; D.F. Howell; H. Han; F. Imbeaux; E. Joffrin; J. Hobirk; O.J. Kwon; X. Litaudon; J. Mailloux;

  • 作者单位

    Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, Roma, Italy;

    Associazione EURATOM-ENEA sulla Fusione, Consorzio RFX Padova, Italy;

    General Atomics, San Diego, CA, USA;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

    Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, Roma, Italy;

    Associazione EURATOM-ENEA sulla Fusione, IFP Milano, Italy;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

    Department of Nuclear Engineering, Seoul National University, Seoul 151-742 Korea;

    CEA, IRFM, F-13108 Saint Paul-lez-Durance, France;

    CEA, IRFM, F-13108 Saint Paul-lez-Durance, France;

    Max-Planck-Institut fuer Plasmaphysik, Garching, Germany, Euratom Assoziation;

    Department of Physics, Daegu University, Gyeongbuk 712-714 Korea;

    CEA, IRFM, F-13108 Saint Paul-lez-Durance, France;

    EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB, UK;

  • 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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