It is shown, by solving the drift kinetic equation, that the asymptotic values of the poloidal mass flow and the bootstrap current in the banana regime of large-aspect-ratio tokamak plasmas are not affected by orbit squeezing. However, because the definition of ion collisionality v*i is reduced by a factor S-3/2, with S=1-(ρpid lnE r/dr) (cEr/Bpvti), the values of both the poloidal mass flow and the bootstrap current at the banana-plateau transition are different from those of the conventional neoclassical theory. Here, ρpi is the ion poloidal gyroradius, Er is the radial electric field, c is the speed of light, Bp is the poloidal magnetic strength, vti is the ion thermal speed, and r is the local radius. The implications for the experimental observations of poloidal rotation speeds in high mode (H mode) are discussed.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics