Sherwood 2015

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Global reduced two-fluid studies of tokamak edge turbulence

Author: Manaure Francisquez
Requested Type: Poster Only
Submitted: 2015-01-19 20:58:04

Co-authors: Ben Zhu, Barrett N. Rogers

Contact Info:
Dartmouth College
6127 Wilder Laboratory
Hanover, NH   03755

Abstract Text:
The time evolution of plasma profiles in the high-aspect ratio tokamak edge is self-consistently studied through global numerical solution of drift-reduced Braginskii equations in relevant parameter regimes. Computer simulations are performed in a radial annulus surrounding the pedestal region. The effect of curvature and temperature gradient driven turbulence on pressure and velocity shear profiles is examined, as well as the relative importance of global effects by comparing radial transport with that obtained by local, flux-tube simulations. Numerical tests and preliminary results of L-H transition studies carried out on L-mode turbulent steady states are discussed. The L-mode steady states exhibit reduced pressure gradients, compared with initial conditions, and a poloidal velocity shear profile that is affected by the choice of outer electrostatic potential boundary condition. Flux surface averages of this velocity shear flatten when the potential vanishes at both core and SOL boundaries.


March 16-18, 2015
The Courant Institute, New York University