Effect of radial electrical field on neoclassical transport in tokamaks

Neoclassical transport theory for tokamaks in the presence of a radial electrical field with shear is developed using Hamiltonian formalism. Diffusion coefficients are derived in both plateau regime including a large electric field and banana regime including the squeezing factor which can greatly affect diffusion at the plasma edge. The scaling on squeezing factor is different from the one given by Shaing and Hazeltine. Rotation speeds are calculated in the scrape-off region and they are in good agreement with measurements on TdeV Tokamak