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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.}
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| Authors: |
Lopez-Bruna, D.;
Newman, D.E.;
Carreras, B.A. [Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)];
Diamond, P.H. [University of California at San Diego, La Jolla, California 92093-0319 (United States)]
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| Publication Date: | 1999 Mar 01 |
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| OSTI Identifier: | 321495 |
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| Resource Type: | Journal Article |
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| Resource Relation: | Journal Name: Physics of Plasmas; Journal Volume: 6; Journal Issue: 3; Other Information: PBD: Mar 1999 |
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| Country of Publication: | United States |
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| Language: | English |
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| Format: | Size: pp. 854-862 |
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| Other Number(s): | Journal ID: PHPAEN; ISSN 1070-664X; TRN: 99:003500 |
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| Subject: | 70 PLASMA PHYSICS AND FUSION; PLASMA WAVES; FLUCTUATIONS; PLASMA CONFINEMENT; TURBULENCE; CHARGED-PARTICLE TRANSPORT; OSCILLATIONS |
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| Update Date: | 2009 Dec 16 |
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