Zonal Flow and Zonal Magnetic Field Generation by Finite <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>β</mi></math></span> Drift Waves: A Theory for Low to High Transitions in Tokamaks

P. N. Guzdar; R. G. Kleva; A. Das; P. K. Kaw

doi:10.1103/PhysRevLett.87.015001

Zonal Flow and Zonal Magnetic Field Generation by Finite $β$ Drift Waves: A Theory for Low to High Transitions in Tokamaks

P. N. Guzdar, R. G. Kleva, A. Das, and P. K. Kaw

Phys. Rev. Lett. 87, 015001 – Published 15 June 2001

Abstract

The understanding of low to high (L-H) transition in tokamaks has been an important area of investigation for more than a decade. Recent 3D finite $β$ simulations of drift-resistive ballooning modes in a flux tube geometry by Rogers et al. [Phys. Rev. Lett. 81, 4396 (1998)] have provided a unique parametrization of the transition in a two-dimensional phase space. Comparison of the threshold curve in this phase space with data from ASDEX and C-MOD has shown very good agreement. In this Letter we provide a simple theory, based on the generation of zonal flow and zonal magnetic field in a finite-beta plasma, which explains this threshold curve for L-H transition in tokamaks.