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A current-driven electromagnetic mode in sheared and toroidal configurations

István Pusztai (Institutionen för teknisk fysik, Nukleär teknik) ; P. J. Catto ; F. I. Parra ; M. Barnes
Plasma Physics and Controlled Fusion (0741-3335). Vol. 56 (2014), 12, p. Art. no. 129501.
[Artikel, refereegranskad vetenskaplig]

The induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal speed, the Alfven mode wave solutions of the electromagnetic gyrokinetic equation can become nearly purely growing kink modes. Using the new 'low-flow' version of the gyrokinetic code GS2 developed for momentum transport studies (Barnes et al 2013 Phys. Rev. Lett. 111 055005), we are able to model the effect of the induced parallel electric field on the electron distribution to study the destabilizing influence of current on stability. We identify high mode number kink modes in GS2 simulations and make comparisons to analytical theory in sheared magnetic geometry. We demonstrate reassuring agreement with analytical results both in terms of parametric dependences of mode frequencies and growth rates, and regarding the radial mode structure.

Nyckelord: kink mode, gyrokinetic, current gradient, instability, simulation

First version published with DOI: 10.1088/0741-3335/56/3/035011

Denna post skapades 2014-04-03. Senast ändrad 2015-07-28.
CPL Pubid: 196156


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


Fusion, plasma och rymdfysik

Chalmers infrastruktur