Two‐stage turbulence suppression andE×Bvelocity shear measured at the L–H transition
作者:
R. Philipona,
E. J. Doyle,
N. C. Luhmann,
W. A. Peebles,
C. L. Rettig,
R. J. Groebner,
K. H. Burrell,
P. Gohil,
H. Matsumoto,
R. D. Stambaugh,
期刊:
Physics of Fluids B: Plasma Physics
(AIP Available online 1993)
卷期:
Volume 5,
issue 1
页码: 87-91
ISSN:0899-8221
年代: 1993
DOI:10.1063/1.860871
出版商: AIP
数据来源: AIP
摘要:
At the onset of the L–H transition in the DIII‐D tokamak [PlasmaPhysicsandControlledNuclearFusionResearch, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. I, p.159], a fast (≊100 &mgr;sec) suppression of microturbulence is observed as the edge transport barrier is formed. This fast edge suppression is followed by a much slower (tens of msec), but substantial (≥50%) reduction in the relative density fluctuation level. This second turbulence suppression phase, which is observed to correlate with growingE×Bvelocity shear, has been localized to the plasmainterior, and may explain why the observed transport reduction in the H mode has been observed to extend deep into the plasma, well beyond the edge transport barrier.
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