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Artigo Revisado por pares
BIBTEX RIS

Investigation of the bifurcation character of the H-mode in ASDEX Upgrade

1995; IOP Publishing; Volume: 37; Issue: 4 Linguagem: Inglês

10.1088/0741-3335/37/4/005

ISSN

1361-6587

Autores

H. Zohm, W. Suttrop, K. Büchl, H. J. de Blank, O. Gruber, A. Kallenbach, V. Mertens, F. Ryter, M. Schittenhelm,

Tópico(s)

Ionosphere and magnetosphere dynamics

Resumo

The so-called 'dithering cycles', i.e. periodic L-H-L transitions, are studied in the ASDEX Upgrade tokamak. The cycle repetition frequency is approximately 2 kHz; high-resolution ECE measurements show that Tc changes during the cycle consistent with the assumption of the periodic build-up and destruction of the edge transport barrier characteristic of the H-mode. A study of the conditions under which the cycles occur reveals that with the unfavourable Del B drift direction, the cycles are suppressed. These observations are interpreted in a schematic bifurcation diagram; we find that the width of the bifurcation varies with the reversal of the Del B drift.

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