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


full-F gyro-fluid theory

polarization closure


Markus Held

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Plasma Physics and Fusion Energy

M. Wiesenberger

Technical University of Denmark (DTU)

A. Kendl

University of Innsbruck

Nuclear Fusion

0029-5515 (ISSN)

Vol. 60 6 066014

Subject Categories

Physical Sciences

Earth and Related Environmental Sciences

Fusion, Plasma and Space Physics



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