Abstract
An inverse aspect ratio (= e) expansion of a low-pressure, axisymmetric
tokamak equilibrium is presented. The usual assumption of the
s – α model (sharp pressure gradient in a
small layer) is used to determine the first order correction in e for various
physical quantities. In the infinite aspect ratio limit, the results of the
standard s – α model are recovered. Finite
toroidicity effects on ion temperature-gradient-driven ballooning modes are
discussed and a numerical comparison between the two models is presented.
Subject
General Physics and Astronomy