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On mapping models of field lines in a stochastic magnetic field

机译:关于随机磁场中的磁力线映射模型

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摘要

Mapping models of Hamiltonian systems are discussed using the example of magnetic field lines in magnetically confined fusion plasmas. They are usually constructed in a certain symplectic form by imposing several constraints that make them compatible with a toroidal geometry. The possible symplectic forms of model mappings for Hamiltonian systems are derived using the recently developed method for the construction of symplectic mappings (Abdullaev S.S. 2002 J. Phys. A 35 2811). It is shown that the symplectic mappings may have symmetric and nonsymmetric forms. The generating function of the symmetric mapping depends only on the perturbation field while the one for the nonsymmetric map depends also on the safety factor (or winding number). Mapping models, particularly, a global mapping model in a toroidal system, the tokamap (Balescu R. et al 1998 Phys. Rev. E 58 951), usually used in plasma physics are reviewed and their relations with continuous Hamiltonian systems are discussed. The symmetric form of the tokamap is proposed and compared with the conventional tokamap. The symmetric and nonsymmetric mapping models for field lines in ergodic divertor tokamaks are also considered. It is shown that symmetric mappings closely describe original Hamiltonian systems in comparison with nonsymmetric mappings.
机译:哈密​​顿系统的映射模型以磁约束聚变等离子体中的磁场线为例进行了讨论。通常通过施加使它们与环形几何体兼容的几个约束,以某种辛的形式构造它们。使用最新开发的构造辛映射的方法(Abdullaev S.S. 2002 J. Phys。A 35 2811),导出汉密尔顿系统模型映射的可能辛形式。结果表明,辛映射可以具有对称形式和非对称形式。对称映射的生成函数仅取决于扰动场,而非对称映射的生成函数还取决于安全系数(或绕组数)。回顾了通常用于等离子体物理的制图模型,特别是环形系统中的全局制图模型tokamap(Balescu R.等人,1998,Phys。Rev. E 58 951),并讨论了它们与连续哈密顿系统的关系。提出了tokamap的对称形式并将其与常规tokamap进行比较。还考虑了遍历遍历偏光托卡马克中场线的对称和非对称映射模型。结果表明,与非对称映射相比,对称映射紧密地描述了原始的汉密尔顿系统。

著录项

  • 来源
    《Nuclear fusion》 |2004年第6期|p. S12-S27|共16页
  • 作者

    S. S. Abdullaev;

  • 作者单位

    Institut fur Plasmaphysik, Forschungszentrum Julich GmbH, EURATOM Association, Trilateral Euregio Cluster, D-52425 Julich, 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 原子核物理学、高能物理学;
  • 关键词

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