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首页> 外文期刊>Plasma physics and controlled fusion >Investigating the radial structure of axisymmetric fluctuations in the TCV tokamak with local and global gyrokinetic GENE simulations
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Investigating the radial structure of axisymmetric fluctuations in the TCV tokamak with local and global gyrokinetic GENE simulations

机译：用局部和全球旋转基因模拟研究TCV Tokamak轴对称波动的径向结构

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摘要

Axisymmetric (n = 0) density fluctuations measured in the TCV tokamak are observed to possess a frequency f(0) which is either varying (radially dispersive oscillations) or a constant over a large fraction of the plasma minor radius (radially global oscillations) as reported in a companion paper (Z Huang et al, this issue). Given that f(0) scales with the sound speed and given the poloidal structure of density fluctuations, these oscillations were interpreted as Geodesic Acoustic Modes, even though f(0) is in fact smaller than the local linear GAM frequency f(GAM). In this work we employ the Eulerian gyrokinetic code GENE to simulate TCV relevant conditions and investigate the nature and properties of these oscillations, in particular their relation to the safety factor profile. Local and global simulations are carried out and a good qualitative agreement is observed between experiments and simulations. By varying also the plasma temperature and density profiles, we conclude that a variation of the edge safety factor alone is not sufficient to induce a transition from global to radially inhomogeneous oscillations, as was initially suggested by experimental results. This transition appears instead to be the combined result of variations in the different plasma profiles, collisionality and finite machine size effects. Simulations also show that radially global GAM-like oscillations can be observed in all fluxes and fluctuation fields, suggesting that they are the result of a complex nonlinear process involving also finite toroidal mode numbers and not just linear global GAM eigenmodes.
机译：观察到在TCV Tokamak中测量的轴对称（n = 0）浓度波动以具有频率f（0），其在等离子体小半径（径向全局振荡）的大部分上变化（径向分散振荡）或恒定在伴侣纸上报道（z Huang等，这个问题）。考虑到F（0）具有声速并且给定浓度波动的单极结构，这些振荡被解释为测地声模式，即使F（0）实际上比本地线性GAM频率f（GAM）小）。在这项工作中，我们采用欧拉血石胆管内码基因来模拟TCV相关条件，并调查这些振荡的性质和性质，特别是与安全因子概况相关。进行本地和全球模拟，实验与模拟之间观察到良好的定性协议。通过改变等离子体温度和密度分布，我们得出结论，仅仅通过实验结果最初提出的，仅仅是诱导从全局到径向不均匀振荡的过渡的边缘安全系数的变化。此转换算像是不同等离子体轮廓，碰撞性和有限机尺寸效应的变化的组合结果。模拟还表明，在所有助熔剂和波动场中可以观察到径向全局的Gam样振荡，表明它们是涉及有限环形模式编号的复杂非线性过程的结果，而不仅仅是线性全球Gam特征模点。

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    Merlo G.; Brunner S.; Huang Z.; Coda S.; Gorler T.; Villard L.; Navarro A. Banon; Dominski J.; Fontana M.; Jenko F.; Porte L.; Told D.;

  • 作者单位

    Univ Calif Los Angeles Los Angeles CA 90095 USA;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Univ Calif Los Angeles Los Angeles CA 90095 USA;

    Princeton Univ Dept Astrophys Sci Princeton NJ 08544 USA;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Univ Calif Los Angeles Los Angeles CA 90095 USA;

    Ecole Polytech Fed Lausanne Swiss Plasma Ctr CH-1015 Lausanne Switzerland;

    Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
  • 关键词

    gyrokinetics; microturbulence; geodesic acoustic mode;

    机译：gyrokinetics;微矛盾;测地声学模式;

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