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Kinetic effects on a tokamak pedestal ion flow, ion heat transport and bootstrap current

P. J. Catto ; F. I. Parra ; G. Kagan ; J. B. Parker ; István Pusztai (Institutionen för teknisk fysik, Nukleär teknik) ; M. Landreman
Plasma Physics and Controlled Fusion (0741-3335). Vol. 55 (2013), 4,
[Artikel, refereegranskad vetenskaplig]

We consider the effects of a finite radial electric field on ion orbits in a subsonic pedestal. Using a procedure that makes a clear distinction between a transit average and a flux surface average we are able to solve the kinetic equation to retain the modifications due to finite E X B drift orbit departures from flux surfaces. Our approach properly determines the velocity space localized, as well as the nonlocal, portion of the ion distribution function in the banana and plateau regimes in the small aspect ratio limit. The rapid variation of the poloidal ion flow coefficient and the electrostatic potential in the total energy modify previous banana regime evaluations of the ion flow, the bootstrap current, and the radial ion heat flux in a subsonic pedestal. In the plateau regime, the rapid variation of the poloidal flow coefficient alters earlier results for the ion flow and bootstrap current, while leaving the ion heat flux unchanged since the rapid poloidal variation of the total energy was properly retained.

Nyckelord: toroidal confinement systems, plasma transport, banana regime



Denna post skapades 2013-06-05. Senast ändrad 2015-07-28.
CPL Pubid: 177963

 

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Institutioner (Chalmers)

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

Ämnesområden

Fysik

Chalmers infrastruktur