Abstract
Abstract
We implement the higher order gyrokinetic theory developed in Dudkovskaia et al (2023 Plasma Phys. Control. Fusion
65 045010), reduced to the limit of
B
ϑ
/
B
0
≪
1
, where B
0 is the tokamak equilibrium magnetic field, and B
ϑ
is its poloidal component, in the local gyrokinetic turbulence code, GS2. The principal motivation for this extension is to quantify the importance of neoclassical flows in electromagnetic gyrokinetics, with a particular interest in sharp pressure gradient regions where the bootstrap current becomes dominant. To incorporate neoclassical equilibrium physics, GS2 is coupled to NEO, a multi-species drift kinetic solver. It is found that the regions where microinstabilities are most likely to be influenced by neoclassical equilibrium effects are in a pedestal plasma and a spherical tokamak core plasma.
Funder
EUROfusion
Engineering and Physical Sciences Research Council
Subject
Condensed Matter Physics,Nuclear Energy and Engineering