Article overview

Slow L-H transitions in DIII-D plasmas
R J Colchin ; M J Schaffer ; B A Carreras ; G R McKee ; R Maingi ; T N Carlstrom ; D L Rudakov ; C M Greenfield ; T L Rhodes ; E J Doyle ; N H Brooks ; M E Austin ;
Date:	24 Jun 2002
Journal:	Phys Rev Lett, 88 (25 Pt 1), 255002
Abstract:	The transition from the low to the high mode of plasma confinement ( L-H transition) is studied in the DIII-D by an experimental technique which allows an arbitrarily slow transition. During an initial transition, periodic turbulent instability bursts are observed near the separatrix which inhibit the full transition. These bursts are damped by self-generated shear flows, and a predator-prey-type relationship is shown to give a good description of the data. As the neutral-beam power is raised, the oscillations change to type III edge localized modes. Another transition then leads to a quiet H mode.
Source:	PubMed, pmid12097092
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