Vernay, T., Brunner, S. (Stephan), Villard, Laurent, McMillan, Ben F., Jolliet, Sebastien, Bottino, Alberto, Görler, T. and Jenko, F. (2013) Global gyrokinetic simulations of TEM microturbulence. Plasma Physics and Controlled Fusion, Volume 55 (Number 7). Article number 074016. doi:10.1088/0741-3335/55/7/074016

Research output not available from this repository, contact author.

Request Changes to record.

Abstract

Global gyrokinetic simulations of electrostatic temperature-gradient-driven trapped-electron-mode (TEM) turbulence using the δf particle-in-cell code ORB5 are presented. The electron response is either fully kinetic or hybrid, i.e. considering kinetic trapped and adiabatic passing electrons. A linear benchmark in the TEM regime against the Eulerian-based code GENE is presented. Two different methods for controlling the numerical noise, based, respectively, on a Krook operator and a so-called coarse-graining approach, are discussed and successfully compared. Both linear and non-linear studies are carried out for addressing the issue of finite-ρ*-effects and finite electron collisionality on TEM turbulence. Electron collisions are found to damp TEMs through the detrapping process, while finite-ρ*-effects turn out to be important in the non-linear regime but very small in the linear regime. Finally, the effects of zonal flows on TEM turbulence are briefly considered as well and shown to be unimportant in the temperature-gradient-driven TEM regime. Consistently, basically no difference is found between linear and non-linear critical electron temperature gradients in the TEM regime.

Item Type:	Journal Article
Subjects:	Q Science > QA Mathematics Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Turbulence -- Simulation methods, Tokamaks, Plasma confinement
Journal or Publication Title:	Plasma Physics and Controlled Fusion
Publisher:	Institute of Physics Publishing Ltd.
ISSN:	0741-3335
Official Date:	2013
Dates:	Date Event 2013 Published
Volume:	Volume 55
Number:	Number 7
Page Range:	Article number 074016
DOI:	10.1088/0741-3335/55/7/074016
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF)

Request changes or add full text files to a record

Repository staff actions (login required)

View Item