Transient transport barriers in ohmic and electron cyclotron heated RTP plasmas: Relation with rational magnetic surfaces

TitleTransient transport barriers in ohmic and electron cyclotron heated RTP plasmas: Relation with rational magnetic surfaces
Publication TypeJournal Article
Year of Publication2000
AuthorsG. Gorini, P. Mantica, G.MD Hogeweij, J. de Kloe, N.JL Cardozo, R. T. P. Team
JournalPlasma Physics and Controlled Fusion
Volume42
PaginationA161-A168
Date PublishedMay
ISBN Number0741-3335
Abstract

Oblique pellet injection experiments have been performed in RTP ohmic and electron cyclotron (EC) heated plasmas. Peripheral cooling induces a transient rise of the electron temperature (ir,) in the plasma core, with the formation of a region of a high T-e gradient (transient transport barrier). The position of the barrier appears to be linked with the location of low-order rational magnetic surfaces. For Ohmic and EC heated plasmas with resonance moderately off-axis, the T-e rise is peaked in the plasma centre and the footpoint of the barrier is located close to the q = 2 surface. For EC plasmas with far off-axis resonance, i.e. in plasmas exhibiting hollow T-e profiles, the T-e rise starts off-axis, near the innermost low order rational surface (typically q = 3). It then propagates to the centre in a seemingly diffusive way.

DOI10.1088/0741-3335/42/5a/317
PID

3c698697c43d2966d5c2dba7448b95f9

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