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Nonlinear excitation of a geodesic acoustic mode by reversed shear Alfvén eignemodes

Plasma Science and Technology 2022年第2期24卷 57-61页

作者：王亚辉王涛魏士朝仇志勇 Institute for Fusion theory and Simulation and Department of Physics Zhejiang UniversityHangzhou 310027People's Republic of China Center for Nonlinear Plasma Science and ENEA C.R.Frascati Frascati 65-00044Italy

The parametric decay process of a reversed shear Alfvén eigenmeode(RSAE)into a geodesic acoustic mode and a kinetic RSAE is investigated using nonlinear gyrokinetic theory.The excitation conditions mainly require the pump RSAE amplitude to exceed a certain threshold,which could be readily satisfied in burning plasmas operated in steady-state advanced scenario.This decay process can contribute to thermal plasma heating and confinement improvement.

关键词： reversed shear Alfvén eigenmode geodesic acoustic mode gyrokinetic theory nonlinear mode coupling burning plasmas alpha channelling

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Global and Kinetic MHD Simulation by the Gpic-MHD Code

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Plasma Science and Technology 2011年第5期13卷 528-534页

作者： Hiroshi NAITOU Yusuke YAMADA Kenji KAJIWARA Wei-li LEE Shinji TOKUDA Masatoshi YAGI Graduate School of Science and Engineering Yamaguchi University Princeton Plasma Physics Laboratory International Fusion Energy Research Center Research Institute for Applied Mechanics Kyushu University Japan Atomic Energy Agency

In order to implement large-scale and high-beta tokamak simulation, a new algorithm of the electromagnetic gyrokinetic PIC （particle-in-cell） code was proposed and installed on the Gpic-MHD code [gyrokinetic PIC code for magnetohydrodynamic （MHD） simulation]. In the new algorithm, the vorticity equation and the generalized Ohm＇s law along the magnetic field are derived from the basic equations of the gyrokinetic Vlasov, Poisson, and Ampere system and are used to describe the spatio-temporal evolution of the field quantities of the electrostatic potential φ and the longitudinal component of the vector potential Az. The basic algorithm is equivalent to solving the reduced-MHD-type equations with kinetic corrections, in which MHD physics related to Alfven modes are well described. The estimation of perturbed electron pressure from particle dynamics is dominant, while the effects of other moments are negligible. Another advantage of the algorithm is that the longitudinal induced electric field, ETz = -δAz/δt, is explicitly estimated by the generalized Ohm＇s law and used in the equations of motion. Furthermore, the particle velocities along the magnetic field are used （vz-formulation） instead of generalized momentums （pz-formulation）, hence there is no problem of ＇cancellation＇, which would otherwise appear when Az is estimated from the Ampere＇s law in the pz-formulation. The successful simulation of the collisionless internal kink mode by the new Gpic-MHD with realistic values of the large-scale and high-beta tokamaks revealed the usefulness of the new algorithm.

关键词： tokamak gyrokinetic theory magnetohydrodynamics internal kink mode

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Unexpanded nonlinear electromagnetic gyrokinetic equations for magnetized plasmas

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Plasma Science and Technology 2020年第10期22卷 1-4页

作者：陈骝 Fulvio ZONCA 陈昊天 Institute for Fusion theory and Simulation and Department of Physics Zhejiang UniversityHangzhou 310027People’s Republic of China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697United States of America ENEA Fusion and Nuclear Safety DepartmentC.R.FrascatiVia E.Fermi 4500044 Frascati(Roma)Italy Institute of Space Science and Technology Nanchang UniversityNanchang 330031.People's Republic of China

Nonlinear electromagnetic gyrokinetic equations have been constructed without expanding the field variables into background and finite but small-amplitude fluctuating components. At the long-wavelength limit, these unexpanded nonlinear gyrokinetic equations recover the wellknown drift-kinetic equations. At the expanded limit, they recover the usual nonlinear gyrokinetic equations. These equations can therefore be applied to long-term simulations covering from microscopic to macroscopic spatial scales.

关键词： gyrokinetic theory plasma turbulence nonlinear phenomena

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