Modeling of Turbulent Transport and Flow Generation in the HELCAT Experiment
A.S. Ware, M. Olsen, M. Breyfogle, M. Gilmore, E. Schuster
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Atlanta, Georgia, November 2-6, 2009
Abstract
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This work investigates modeling of transport and flow generation in a
linear plasma device using a 1-D transport code. The goal is to model
the HELCAT experiment including the use of biased concentric rings as
control elements for the radial electric field profile. By varying the
bias voltages, the local E×B flow can be modified. The effect will be
identical to a source of E×B flow in the limit of zero β (i.e., when
diamagnetic flows are negligible). By varying the momentum sources a
sheared radial electric field can be generated that can suppress
turbulent particle and heat transport. Analysis of drift wave
turbulence models will be used to derive models for the growth rate
and Reynolds stress parameterization in the transport model. We will
test the impact of different numerical models for the mo- mentum
sources and compare the results with experimental measurements of the
radial electric field in the HELCAT experiment.