Shape dependence of ohmic H-mode accessibility in TCV
Following boronization, TCV has shown a remarkable facility to access H-mode with ohmic heating alone. H-modes have been observed in virtually all categories of configurations (SND DND and limiter) and over a wide range of plasma parameters. The accessibility has been found to depend on the wall conditioning and, if this is sufficient, a minimum density and plasma heating current for a given configuration have been found necessary to obtain an H-mode transition. These threshold behaviours, indicate that other parameters (such as edge density, temperature, or their gradients) may determine the occurrence of the L-H transition. These experiments emphasize the requirement that a single parameter at a time be varied at least until the domain factors have been determined.
Bibliographic Reference: Article: Proceedings of the 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24-28, 1996, pp. 119-122
Record Number: 199710342 / Last updated on: 1997-04-14
Original language: en
Available languages: en