Dissemin is shutting down on January 1st, 2025

Published in

IOP Publishing, Plasma Physics and Controlled Fusion, 5A(46), p. A113-A119

DOI: 10.1088/0741-3335/46/5a/012

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Edge transport barrier formation in compact helical system

This paper is available in a repository.
This paper is available in a repository.

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Preprint: archiving forbidden
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Postprint: archiving forbidden
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Published version: archiving forbidden
Data provided by SHERPA/RoMEO

Abstract

The edge transport barrier (ETB) for particle transport is formed in the neutral beam (NB) heated hydrogen discharges in compact helical system (CHS). The transition to the ETB formation and the back transition are controlled by the heating power. The existence of the heating power threshold is confirmed and it is roughly proportional to the density. The Hα emission signal shows a clear drop at the transition (the timescale of signal decrease is ~1 ms for the high heating power case). The ETB formation continues for the full duration of NB injection (100 ms) with a moderate level of radiation power loss. Local density profile measurement shows increase of the edge density and the movement of the density gradient region towards the edge.