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Fluctuation level bursts in a model of internal transport barrier formation (1999)

López-Bruna, D. ; Newman, D. E. ; Carreras, B. A.

[S.l.] : American Institute of Physics (AIP)

Physics of Plasmas 6 (1999), S. 854-862

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ISSN: 1089-7674

Source: AIP Digital Archive

Topics: Physics

Notes: 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, Posc, below the power threshold for the transition to the enhanced confinement regime, Pth. In the calculations, Posc∼0.5Pth. This suggests that the oscillations avoid an early transition at Pth=Posc, so any mechanism that eliminates the oscillations may lower the transition power. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.873325

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