Calculation Model for Density Limits in Auxiliary Heated, Gas Fueled Tokamaks andApplication to DIII-D Model Problems

摘要

A model for the calculation of density limits in high confinement (H-mode)tokamaks is described. The model consists of coupled calculations of: (1) the power, particle and momentum balances for the core plasma and for the divertor/SOL plasma; (2) the transport of fueling and recycling neutrals; (3) pedestal gradient scale lengths and MHD limits; (4) confinement degradation due to thermal instabilities in the edge transport barrier; (5) divertor and core MARFE (multifaceted asymmetric radiation from edge) onset; (6) radiative collapse leading to disruption, and (7) power threshold for high-to-low mode transition.