A dimensionless criterion for characterizing internal transport barriers in JET

Analysis of experiments performed at different heating powers and magnetic field intensities shows that the existence of internal transport barriers in JET can be inferred in regions of space-time where the ratio of the ion gyroradius to the local gradient scale length exceeds some critical value. A...

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Bibliographic Details
Published in:Nuclear fusion 2002-05, Vol.42 (5), p.520-526, Article 304
Main Authors: Tresset, G, Litaudon, X, Moreau, D, Garbet, X, Programme, Contributors to the EFDA-JET Work
Format: Article
Language:English
Subjects:
Data reduction
Exact sciences and technology
General Physics
Magnetic confinement and equilibrium
Magnetic fields
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma heating
Plasma properties
Plasma stability
Pressure effects
Shear flow
Tokamaks
Transport properties
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Summary:Analysis of experiments performed at different heating powers and magnetic field intensities shows that the existence of internal transport barriers in JET can be inferred in regions of space-time where the ratio of the ion gyroradius to the local gradient scale length exceeds some critical value. A possible interpretation leading to the theoretical relevance of this dimensionless parameter as a local indicator of a bifurcated plasma state is the stabilization of turbulence by the E x B shear flows associated with large pressure gradients and plasma rotation. Large database analysis and real time plasma control are envisaged as attractive applications.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/42/5/304