Perturbative studies of toroidal momentum transport using neutral beam injection modulation in the Joint European Torus: Experimental results, analysis methodology, and first principles modeling

Mantica, P; Tala, T; Ferreira, JS; Peeters, AG; Salmi, A; Strintzi, D; Weiland, J; Brix, M; Giroud, C; Corrigan, G; Naulin, V; Tardini, G; Zastrow, K-D

dc.contributor.author	Mantica, P	en
dc.contributor.author	Tala, T	en
dc.contributor.author	Ferreira, JS	en
dc.contributor.author	Peeters, AG	en
dc.contributor.author	Salmi, A	en
dc.contributor.author	Strintzi, D	en
dc.contributor.author	Weiland, J	en
dc.contributor.author	Brix, M	en
dc.contributor.author	Giroud, C	en
dc.contributor.author	Corrigan, G	en
dc.contributor.author	Naulin, V	en
dc.contributor.author	Tardini, G	en
dc.contributor.author	Zastrow, K-D	en
dc.date.accessioned	2014-03-01T01:34:17Z
dc.date.available	2014-03-01T01:34:17Z
dc.date.issued	2010	en
dc.identifier.issn	1070-664X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20679
dc.subject	pinch effect	en
dc.subject	plasma beam injection heating	en
dc.subject	plasma kinetic theory	en
dc.subject	plasma magnetohydrodynamics	en
dc.subject	plasma simulation	en
dc.subject	plasma toroidal confinement	en
dc.subject	plasma transport processes	en
dc.subject	Tokamak devices	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	Antiphase	en
dc.subject.other	Collective modes	en
dc.subject.other	Core region	en
dc.subject.other	Data analysis	en
dc.subject.other	Experimental techniques	en
dc.subject.other	First-principles modeling	en
dc.subject.other	Gyrokinetic codes	en
dc.subject.other	Heat diffusivity	en
dc.subject.other	Inhomogeneous plasma	en
dc.subject.other	Joint European Torus	en
dc.subject.other	Momentum diffusivity	en
dc.subject.other	Momentum transports	en
dc.subject.other	Neutral beam injection	en
dc.subject.other	Neutral beams	en
dc.subject.other	Periodic perturbation	en
dc.subject.other	Quantitative comparison	en
dc.subject.other	Quasi-linear	en
dc.subject.other	Theoretical prediction	en
dc.subject.other	Time-dependent transport	en
dc.subject.other	Toroidal rotation	en
dc.subject.other	Weiland model	en
dc.subject.other	Data reduction	en
dc.subject.other	Diffusion	en
dc.subject.other	Fusion reactors	en
dc.subject.other	Magnetoplasma	en
dc.subject.other	Momentum transfer	en
dc.subject.other	Particle beam injection	en
dc.subject.other	Particle beams	en
dc.subject.other	Plasma theory	en
dc.subject.other	Rotation	en
dc.subject.other	Statistical mechanics	en
dc.subject.other	Momentum	en
dc.title	Perturbative studies of toroidal momentum transport using neutral beam injection modulation in the Joint European Torus: Experimental results, analysis methodology, and first principles modeling	en
heal.type	journalArticle	en
heal.identifier.primary	10.1063/1.3480640	en
heal.identifier.secondary	http://dx.doi.org/10.1063/1.3480640	en
heal.identifier.secondary	092505	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	Perturbative experiments have been carried out in the Joint European Torus [Fusion Sci. Technol. 53 (4) (2008)] in order to identify the diffusive and convective components of toroidal momentum transport. The torque source was modulated either by modulating tangential neutral beam power or by modulating in antiphase tangential and normal beams to produce a torque perturbation in the absence of a power perturbation. The resulting periodic perturbation in the toroidal rotation velocity was modeled using time-dependent transport simulations in order to extract empirical profiles of momentum diffusivity and pinch. Details of the experimental technique, data analysis, and modeling are provided. The momentum diffusivity in the core region (0.2<p<0.8) was found to be close to the ion heat diffusivity (chi(phi)/chi(i)similar to 0.7-1.7) and a significant inward momentum convection term, up to 20 m/s, was found, leading to an effective momentum diffusivity significantly lower than the ion heat diffusivity (chi(eff)(phi)/chi(eff)(i) similar to 0.4). These results have significant implications on the prediction of toroidal rotation velocities in future tokamaks and are qualitatively consistent with recent developments in momentum transport theory. Detailed quantitative comparisons with the theoretical predictions of the linear gyrokinetic code GKW [A. G. Peeters et al., Comput. Phys. Commun. 180, 2650 (2009)] and of the quasilinear fluid Weiland model [J. Weiland, Collective Modes in Inhomogeneous Plasmas (IOP, Bristol, 2000)] are presented for two analyzed discharges. [doi:10.1063/1.3480640]	en
heal.publisher	AMER INST PHYSICS	en
heal.journalName	Physics of Plasmas	en
dc.identifier.doi	10.1063/1.3480640	en
dc.identifier.isi	ISI:000282439300015	en
dc.identifier.volume	17	en
dc.identifier.issue	9	en