FusionPapers
図版検索トレンドwiki日本の研究
© 2026 FUSIONPAPERS
About法務情報
トップに戻る

Finite ion Larmour radius effects in the problem of zonal flow generation by kinetic drift-Alfvén turbulence

V P Lakhin2004年Plasma Physics and Controlled FusionIF 2.2出版社

A theory of spontaneous generation of zonal flows by kinetic drift-Alfvén turbulence in the finite-pressure plasma (β > me/mi) is generalized to include the ion diamagnetic effects and the finite ion Larmour radius effects. In the framework of the corresponding set of generalized two-fluid magnetohydrodynamic equations and on the assumption of a distinct time- and space-scale separation between the turbulent oscillations and the zonal flow, a set of coupled equations is derived to describe the interaction between the turbulence and the flow, consisting of the evolution equation for the spectral function of turbulence and the mean-field equations for zonal flow. The possibility of spontaneous zonal flow generation by the kinetic drift-Alfvén turbulence is investigated in details in several cases. In the case of kinetic drift-Alfvén turbulence with the space scale of the order of the ion Larmour radius or below, the instability caused by the resonant interaction of the wave packet with the slow modulations of zonal flow has been analysed, and the criterion for the onset of the zonal flow instability has been derived. In the case of short-wavelength turbulence, two regimes are considered. It is shown, that, when the frequency of short-wavelength oscillations is close to the electron-drift frequency and the zonal perturbation of plasma density can be described by the Boltzmann Law, the instability criterion is a generalization of the previously obtained result to the case of non-equal temperatures of the ions and electrons. The new regime is found, in which the zonal perturbation of plasma density is negligible. The condition for the onset of resonant instability is obtained.

日本語訳

有限圧力プラズマ(β > me/mi)における運動論的ドリフト・アルヴェン乱流による帯状流の自発生成に関する理論を、イオン反磁性効果と有限イオン・ラーマー半径効果を含むように一般化する。対応する一般化された二流体磁気流体力学方程式の枠組みにおいて、乱流振動と帯状流の間に明確な時間・空間スケール分離を仮定し、乱流と流れの間の相互作用を記述する連立方程式系を導出する。これは、乱流のスペクトル関数に対する発展方程式と、帯状流に対する平均場方程式から構成される。運動論的ドリフト・アルヴェン乱流による帯状流の自発生成の可能性を、いくつかの場合について詳細に調べる。イオン・ラーマー半径のオーダーの空間スケールを持つ運動論的ドリフト・アルヴェン乱流の場合、波動パケットと帯状流のゆっくりとした変調との共鳴的相互作用によって引き起こされる不安定性を解析し、帯状流不安定性の発生条件を導出する。短波長乱流の場合、二つのレジームを考察する。短波長振動の周波数が電子ドリフト周波数に近く、プラズマ密度の帯状摂動がボルツマンの法則で記述できる場合、不安定性の発生条件は、イオンと電子の温度が非等価な場合に対する先行結果の一般化となることが示される。プラズマ密度の帯状摂動が無視できる新しいレジームが見出される。共鳴不安定性の発生条件が得られる。

wiki

Alfvén waveZonal flow
この論文にはまだAI要約がありません。

関連論文

Non-linear zonal dynamics of drift and drift-Alfvén turbulence in tokamak plasmas

2001Nuclear Fusion

Simulation of zonal flow excitation by drift mode turbulence: applications to tokamaks and the magnetopause

2008Plasma Physics and Controlled Fusion

A review of zonal flow experiments

2009Nuclear Fusion

Multi-scale-nonlinear interactions among micro-turbulence, double tearing instability and zonal flows

2007Nuclear Fusion

Generation of zonal perturbations and transport barriers in plasmas

2011Nuclear Fusion

Understanding nonlinear saturation in zonal-flow-dominated ion temperature gradient turbulence

2015Plasma Physics and Controlled Fusion

Observation and characterization of radially sheared zonal flows in DIII-D

2003Plasma Physics and Controlled Fusion

Numerical simulations of collisional drift-wave turbulence in a magnetized plasma column

2007Plasma Physics and Controlled Fusion

On the interaction of turbulence and flows in toroidal plasmas

2011Plasma Physics and Controlled Fusion

Interplanetary and interstellar plasma turbulence

2007Plasma Physics and Controlled Fusion