Toroidal field ripple and finite beta effects on INTOR performance. INTOR Phase II-A, Session VI

Transport calculations have been carried out for the INTOR design to assess the sensitivity of performance to toroidal field ripple-induced losses, radial diffusion of the fast alpha particles, prompt loss of alpha particles born on banana-trapped orbits and finite beta induced electron conduction losses. The POPCON option in the 1-1/2-D WHIST transport code is used for these assessments with 150 keV D0 neutral beam injection. The toroidal field ripple contours were obtained from the INTOR toroidal field coil design then sealed up from 0.7% to 1.2% at the outboard plasma edge. Ripple conduction losses include ripple-trapped particles in both the collisional and collisionless detrapping regimes and three regimes of banana-trapped particles. A multi-energy group model is used for radial diffusion of the fast alpha particles coupled with a classical model for collisional energy relaxation on the background electrons and ions