Kinetic effects on a tokamak pedestal ion flow, ion heat transport and bootstrap current
Artikel i vetenskaplig tidskrift, 2013

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.

plasma transport

toroidal confinement systems

banana regime

Författare

P. J. Catto

Massachusetts Institute of Technology (MIT)

F. I. Parra

Massachusetts Institute of Technology (MIT)

G. Kagan

Los Alamos National Laboratory

J. B. Parker

Princeton Plasma Physics Laboratory

Istvan Pusztai

Chalmers, Teknisk fysik, Nukleär teknik

M. Landreman

Massachusetts Institute of Technology (MIT)

Plasma Physics and Controlled Fusion

0741-3335 (ISSN) 1361-6587 (eISSN)

Vol. 55 4

Ämneskategorier

Fysik

DOI

10.1088/0741-3335/55/4/045009