Padé-based arbitrary wavelength polarization closures for full-F gyro-kinetic and -fluid models
Journal article, 2020

We propose a solution to the long-standing short wavelength polarization closure shortfall of full-F gyro-fluid models. This is achieved by first finding an appropriate quadratic form of the gyro-fluid moment over the polarization part of the gyro-center Hamiltonian. Secondly, we deduce Padé-based approximations to the latter expression that produce a polarization charge density with the desired order of accuracy and retain linear polarization effects for arbitrary wavelengths. The proposed closures feature proper energy conservation and the anticipated Oberbeck-Boussinesq and long wavelength limits.

full-F gyro-kinetic theory

padè-approximations

full-F gyro-fluid theory

polarization closure

Author

Markus Held

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

M. Wiesenberger

Technical University of Denmark (DTU)

A. Kendl

University of Innsbruck

Nuclear Fusion

0029-5515 (ISSN) 1741-4326 (eISSN)

Vol. 60 6 066014

Subject Categories

Physical Sciences

Earth and Related Environmental Sciences

Fusion, Plasma and Space Physics

DOI

10.1088/1741-4326/ab7a68

More information

Latest update

7/28/2020