Operational range and transport barrier of the H-mode in the stellarator W7-AS
- 1 May 1998
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 40 (5) , 631-634
- https://doi.org/10.1088/0741-3335/40/5/012
Abstract
In W7-AS the H-mode is characterized by an edge transport barrier localized in the first 3-4 cm inside the separatrix. In the ELMy H-mode preceding the quiescent state ELMs appear as a sudden breakdown of the edge transport barrier in coincidence with bursts of fluctuations. Between ELMs fluctuations are identical to those of the quiescent H-mode. The operational range of the quiescent H-mode is determined by narrow windows of the edge rotational transform and a threshold edge electron density. In contrast, ELM-like events are observed for a variety of plasma conditions by far exceeding the narrow operational windows for the quiescent state.Keywords
This publication has 2 references indexed in Scilit:
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