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Gyrokinetic simulations of spherical tokamaks

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Roach, C. M., Abel, I. G., Akers, R. J., Arter, W., Barnes, M., Camenen, Y., Casson, F. J. (Francis James), Colyer, G., Connor, J. W., Cowley, S. C. et al.
(2009) Gyrokinetic simulations of spherical tokamaks. In: 36th European Physical Society Conference on Plasma Physics, Natl Palace Culture, Sofia, Bilgaria, June 29-July 03, 2009. Published in: Plasma Physics and Controlled Fusion, Vol.51 (No.12). Article no. 124020.

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Abstract

This paper reviews transport and confinement in spherical tokamaks (STs) and our current physics understanding of this that is partly based on gyrokinetic simulations. Equilibrium flow shear plays an important role, and we show how this is consistently included in the gyrokinetic framework for flows that greatly exceed the diamagnetic velocity. The key geometry factors that influence the effectiveness of turbulence suppression by flow shear are discussed, and we show that toroidal equilibrium flow shear can sometimes entirely suppress ion scale turbulence in today's STs. Advanced nonlinear simulations of electron temperature gradient (ETG) driven turbulence, including kinetic ion physics, collisions and equilibrium flow shear, support the model that ETG turbulence can explain electron heat transport in many ST discharges.

Item Type: Conference Item (Paper)
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Plasma Physics and Controlled Fusion
Publisher: Institute of Physics Publishing Ltd.
ISSN: 0741-3335
Official Date: December 2009
Volume: Vol.51
Number: No.12
Number of Pages: 11
Page Range: Article no. 124020
Identification Number: 10.1088/0741-3335/51/12/124020
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: UK Engineering and Physical Sciences Research Council, European Communities, Leverhulme Trust Network
Conference Paper Type: Paper
Title of Event: 36th European Physical Society Conference on Plasma Physics
Type of Event: Conference
Location of Event: Natl Palace Culture, Sofia, Bilgaria
Date(s) of Event: June 29-July 03, 2009
URI: http://wrap.warwick.ac.uk/id/eprint/16919

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