A self-consistent model for low-high transitions in tokamaks

Journal Article · Tue Oct 01 04:00:00 EDT 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871520· OSTI ID:383787

Guzdar, P N; Hassam, A B ^[1]

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1. Institute for Plasma Research, University of Maryland, College Park, Maryland 20742-3511 (United States)

A system of equations that couples the rapidly varying fluctuations of resistive ballooning modes to the slowly varying transport of the density, vorticity and parallel momentum have been derived and solved numerically. Only a single toroidal mode number is retained in the present work. The low-mode (L-mode) phase consists of strong poloidally asymmetric particle transport driven by resistive ballooning modes, with larger flux on the outboard side compared to the inboard side. With the onset of shear flow driven by a combination of toroidal drive mechanisms as well as the Reynolds stress, the fluctuations associated with the resistive ballooning modes are attenuated leading to a strong reduction in the particle transport. The drop in the particle transport results in steepening of the density profile leading to the high-mode (H-mode). {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 383787
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 3; ISSN 1070-664X; ISSN PHPAEN
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BALLOONING INSTABILITY
FLOW STRESS
FLUCTUATIONS
H-MODE PLASMA CONFINEMENT
PLASMA SIMULATION
TOKAMAK DEVICES
TRANSPORT THEORY
TURBULENCE