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Title: Fluctuation level bursts in a model of internal transport barrier formation

Fluctuation level bursts in a model of internal transport barrier formation A model of internal transport barriers (ITB) is developed that, in addition to the typical features of ITB models (the phase transition character with a power threshold, barrier front propagation, etc.), exhibits an oscillatory/bursty behavior close to the transition. This behavior comes from the competition between the driving and suppression mechanisms for the turbulence. The onset of the oscillations has a power threshold, P{sub osc}, below the power threshold for the transition to the enhanced confinement regime, P{sub th}. In the calculations, P{sub osc}{approximately}0.5P{sub th}. This suggests that the oscillations avoid an early transition at P{sub th}=P{sub osc}, so any mechanism that eliminates the oscillations may lower the transition power. {copyright} {ital 1999 American Institute of Physics.}
Authors: ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 321495
Resource Type:Journal Article
Resource Relation:Journal Name: Physics of Plasmas; Journal Volume: 6; Journal Issue: 3; Other Information: PBD: Mar 1999
Country of Publication:United States
Language:English
Subject: 70 PLASMA PHYSICS AND FUSION; PLASMA WAVES; FLUCTUATIONS; PLASMA CONFINEMENT; TURBULENCE; CHARGED-PARTICLE TRANSPORT; OSCILLATIONS