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Title: Dynamics and control of internal transport barriers in reversed shear discharges

Dynamics and control of internal transport barriers in reversed shear discharges Transitions to an enhanced confinement regime in tokamak plasmas with negative central magnetic shear have been observed in a number of devices. A simple model incorporating the nonlinear coupling between the turbulent fluctuations and the sheared radial electric field is added to a transport model in order to investigate the dynamics of the transition to this enhanced confinement mode. In this model, by incorporating both the instability growth rate profiles and particle and/or power deposition profiles, a rich variety of transition dynamics is uncovered. Transition dynamics and their concomitant thresholds are examined within the context of these models. In the course of investigating these transitions, potential methods for triggering and controlling these enhanced confinement regimes have been discovered and are discussed. {copyright} {ital 1998 American Institute of Physics.}
Authors: ; ; ; ;
Publication Date:
OSTI Identifier:625837
Resource Type:Journal Article
Data Type:
Resource Relation:Journal Name: Physics of Plasmas; Journal Volume: 5; Journal Issue: 4; Other Information: PBD: Apr 1998
Country of Publication:United States
Language:English
Subject: 70 PLASMA PHYSICS AND FUSION; CHARGED-PARTICLE TRANSPORT; TOKAMAK DEVICES; TURBULENCE; DYNAMICS; ELECTRIC DISCHARGES; FLUCTUATIONS; PLASMA CONFINEMENT