PROJECTION OF ITER PERFORMANCE USING THE MULTIMACHINE L AND H MODE DATABASES

摘要

An overview of recent analyses of H and L mode confinement and L to H mode threshold data is presented. The standard subset of the H mode database, consisting of about 1600 time slices from six tokamaks, leads to power law scalings for ELMy and ELM free discharges, both of which predict a confinement time for ITER of approximately 5.5s. The analysis indicates a strong dependence of confinement time scaling and prediction on the neutral penetration from the divertor into the main chamber. Consideration of dimensionless variables suggests scaling expressions for the H mode threshold which predict threshold powers for ITER of between 100 and 200 MW. Finally, the L mode database has been updated to contain over 1500 time slices from 11 tokamaks. A preliminary empirical scaling based on the total confinement time has been developed.