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Impact of pressure anisotropy on magnetic configuration and stability

机译:压力各向异性对磁结构和稳定性的影响

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摘要

A number of tools have recently been developed to study equilibrium and stability in tokamaks with pressure anisotropy. Here we apply these tools to a Mega Ampere Spherical Tokamak (MAST) discharge to calculate equilibrium, Alfven continua and eigenmodes, through to linear growth and nonlinear saturation of a toroidal Alfven eigenmode (TAE); this is the first study of wave growth and saturation for anisotropic equilibria. Comparisons with the standard tools which assume an isotropic pressure reveal various differences in equilibrium and modes: the safety factor profile in the isotropic reconstruction is reversed shear while the anisotropic reconstruction gives normal shear; the isotropic TAE gap is much narrower than the anisotropic gap; and the TAE radial mode structure is wider in the anisotropic case. These lead to a modification in the resonant regions of fast-ion phase space, and produce a 35% larger linear growth rate and an 18% smaller saturation amplitude for the TAE in the anisotropic analysis compared to the isotropic analysis.
机译:最近已经开发出许多工具来研究具有压力各向异性的托卡马克的平衡和稳定性。在这里,我们将这些工具应用于兆安安特球形托卡马克(MAST)放电,以计算环形Alfven本征模(TAE)的线性增长和非线性饱和,从而计算平衡,Alfven连续模和本征模。这是各向异性平衡波的增长和饱和的第一项研究。与假定各向同性压力的标准工具的比较揭示了平衡和模态的各种差异:各向同性重建中的安全系数分布为反向剪切,而各向异性重建为正切变;各向同性的TAE间隙比各向异性的间隙要窄得多;在各向异性情况下,TAE径向模式结构更宽。与各向同性分析相比,这些导致各向异性离子分析中快离子相空间共振区域的变化,并导致TAE的线性增长速率提高35%,饱和幅度减小18%。

著录项

  • 来源
    《Nuclear fusion》 |2016年第11期|112017.1-112017.9|共9页
  • 作者单位

    Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia;

    Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia;

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

    Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia;

  • 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; equilibrium; stability; anisotropy; MHD; energetic particles; MAST;

    机译:托卡马克平衡;稳定性;各向异性MHD;高能粒子桅杆;

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