Padé-based arbitrary wavelength polarization closures for full-F gyro-kinetic and -fluid models: Paper

M. Held*, Matthias Wiesenberger, Alexander Kendl

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
Article number066014
JournalNuclear Fusion
Volume60
Issue number6
Number of pages11
ISSN0029-5515
DOIs
Publication statusPublished - 2020

Keywords

  • Full-F gyro-fluid theory
  • Full-F gyro-kinetic theory
  • Polarization closure
  • Padè-approximations

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