Strintzi, D., Peeters, A. G. and Weiland, J. (Jan). (2008) The toroidal momentum diffusivity in a tokamak plasma : a comparison of fluid and kinetic calculations. Physics of Plasmas, Volume 15 (Number 4). Article No. 044502. ISSN 1070-664X

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Abstract

Fluid and gyrokinetic calculations of the toroidal momentum diffusivity in a tokamak are compared. The four-moment gyrofluid model predicts the Prandtl number connected with the ion temperature gradient mode reasonably well provided the drift term is kept in the momentum balance. Without the drift term in the momentum balance, some previous gyrofluid models predicted small values of the Prandtl number in the range of experimental observations. It is shown that the drift term enters in the fluid equations through the gyroviscosity. Gyrokinetic calculations of the ion temperature gradient mode with kinetic electrons, and for experimentally relevant parameters yield a Prandtl number in the range 0.7-1.2. (C) 2008 American Institute of Physics.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Tokamaks, Plasma confinement, Plasma dynamics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Date:	April 2008
Volume:	Volume 15
Number:	Number 4
Number of Pages:	4
Page Range:	Article No. 044502
Identification Number:	10.1063/1.2907370
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Euratom, Greece
Grant number:	ERB 5005 CT 99 0100
URI:	http://wrap.warwick.ac.uk/id/eprint/30147

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