Theory of Enhanced Reversed Shear Mode in Tokamaks

Journal Article · Mon Jun 01 00:00:00 EDT 1998 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.80.5353· OSTI ID:636190

Shaing, K C; Aydemir, A Y ^[1]; Houlberg, W A ^[2]; Zarnstorff, M C ^[3]

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1. Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712 (United States)
2. Fusion Energy Division, ORNL, P.O. Box 2009, Oak Ridge, Tennessee 37831-8071 (United States)
3. Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey 08543 (United States)

It is shown that toroidal-magnetic-field ripple-induced particle flux can drive poloidal {bold {ital E}}{times}{bold {ital B}} speed to bifurcate over the local maximum of the nonlinear poloidal (or parallel) viscosity. Here, {bold {ital E}} is the electric field, and {bold {ital B}} is the magnetic field. This mechanism, together with the turbulence suppression due to the radial gradient of the {bold {ital E}}{times}{bold {ital B}} and diamagnetic angular velocity, is employed to explain the enhanced reversed shear mode observed in the core region of tokamaks. {copyright} {ital 1998} {ital The American Physical Society}

• Research Organization: Univesity of Texas
• DOE Contract Number: FG03-96ER54346
• OSTI ID: 636190
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANGULAR VELOCITY
BIFURCATION
ELECTRIC FIELDS
MAGNETIC FIELDS
REVERSED-FIELD PINCH DEVICES
SHEAR
TOKAMAK DEVICES
TURBULENCE
VISCOSITY