H-Mode Pedestal and Threshold Studies Over an Expanded Operating Space on Alcator C-Mod
نویسندگان
چکیده
This paper reports on studies of the edge transport barrier and transition threshold of the High Confinement (H) mode of operation on the Alcator C-Mod tokamak [I. H. Hutchinson et al, Phys. Plasmas 1, 1511 (1994)], over a wide range of toroidal field (2.6-7.86 T) and plasma current (0.4-1.7 MA). The H-mode power threshold and edge temperature at the transition increase with field. Barrier widths, pressure limits and confinement are nearly independent of field at constant current, but the operational space at high B shifts towards higher temperature and lower density and collisionality. Experiments with reversed field and current show that scrape-off-layer flows in the high field side depend primarily on configuration. In configurations with the B×∇B drift away from the active X-point, these flows lead to more counter-current core rotation which apparently contributes to higher H-mode thresholds. In the unfavorable case, edge temperature thresholds are higher and slow evolution of profiles indicates a reduction in thermal transport prior to the transition in particle confinement. Pedestal temperatures in this case are also higher than in the favorable configuration. Both high field and reversed field results suggest that parameters at the L-H transition are influencing the evolution and parameters of the H-mode pedestal.
منابع مشابه
PSFC / JA - 05 - 46 Advances in measurement and modeling of the high - confinement - mode pedestal on the Alcator C - Mod tokamak
Edge transport barrier (ETB) studies on the Alcator C-Mod tokamak [Phys. Plasmas 1, 1511, (1994)] investigate pedestal scalings and radial transport of plasma and neutrals. Pedestal profiles show trends with plasma operational parameters such as total current IP . A ballooning-like I2 P dependence is seen in the pressure gradient, despite calculated stability to ideal ballooning modes. A simila...
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