Anomalous parallel momentum transport due to E×B flow shear in a tokamak plasma

Casson, FJ; Peeters, AG; Camenen, Y; Hornsby, WA; Snodin, AP; Strintzi, D; Szepesi, G

dc.contributor.author	Casson, FJ	en
dc.contributor.author	Peeters, AG	en
dc.contributor.author	Camenen, Y	en
dc.contributor.author	Hornsby, WA	en
dc.contributor.author	Snodin, AP	en
dc.contributor.author	Strintzi, D	en
dc.contributor.author	Szepesi, G	en
dc.date.accessioned	2014-03-01T01:29:52Z
dc.date.available	2014-03-01T01:29:52Z
dc.date.issued	2009	en
dc.identifier.issn	1070-664X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19380
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	Flow shear	en
dc.subject.other	Gyrokinetic simulations	en
dc.subject.other	Heat diffusivity	en
dc.subject.other	Magnetic shear	en
dc.subject.other	Momentum flux	en
dc.subject.other	Momentum transports	en
dc.subject.other	Negative magnetic shear	en
dc.subject.other	Parallel velocity shear	en
dc.subject.other	Shearing rates	en
dc.subject.other	Symmetry-breaking	en
dc.subject.other	Tokamak plasmas	en
dc.subject.other	Toroidal geometry	en
dc.subject.other	Toroidal plasmas	en
dc.subject.other	Fusion reactors	en
dc.subject.other	Momentum	en
dc.subject.other	Momentum transfer	en
dc.subject.other	Plasma flow	en
dc.subject.other	Plasma simulation	en
dc.subject.other	Plasma theory	en
dc.subject.other	Transport properties	en
dc.title	Anomalous parallel momentum transport due to E×B flow shear in a tokamak plasma	en
heal.type	journalArticle	en
heal.identifier.primary	10.1063/1.3227650	en
heal.identifier.secondary	http://dx.doi.org/10.1063/1.3227650	en
heal.identifier.secondary	092303	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	Nondiffusive anomalous momentum transport in toroidal plasmas occurs through symmetry breaking mechanisms. In this paper the contribution of sheared E X B flows to parallel momentum transport [R. R. Dominguez and G. M. Staebler, Phys Fluids B 5, 3876 (1993)] is investigated with nonlinear gyrokinetic simulations in toroidal geometry. The background perpendicular shear is treated independently from the parallel velocity shear to isolate a nondiffusive, nonpinch contribution to the parallel momentum flux. It is found that the size of the term depends strongly on the magnetic shear, with the sign reversing for negative magnetic shear. Perpendicular shear flows are responsible for both symmetry breaking and suppression of turbulence, resulting in a shearing rate at which there is a maximum contribution to the momentum transport. The E X B momentum transport is shown to be quenched by increasing flow shear more strongly than the standard linear quench rule for turbulent heat diffusivity. (C) 2009 American Institute of Physics. [doi:10.1063/1.3227650]	en
heal.publisher	AMER INST PHYSICS	en
heal.journalName	Physics of Plasmas	en
dc.identifier.doi	10.1063/1.3227650	en
dc.identifier.isi	ISI:000270380700013	en
dc.identifier.volume	16	en
dc.identifier.issue	9	en