NEUTRAL PARTICLE DYNAMICS IN THE ALCATOR C-MOD TOKAMAK

摘要

An experimental study of neutral particle dynamics has been carried out over a wide range of operating conditions in the Alcator C Modified (Alcator C-Mod) tokamak using special purpose pressure gauges. Both divertor and midplane pressures are found to depend primarily on the edge plasma regimes defined by the scrape-off layer heat transport. While the maximum divertor neutral pressure (30-60 mtorr) is achieved at high core plasma densities (n-bar_e = (2-4) × 10~20 m~-3), corresponding to the detached divertor state, the maximum ratio of divertor to midplane pressure (～ 70) is achieved in the high recycling transport regime.