April 15-17

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Abstracts

Author: Rhea L Barnett
Requested Type: Poster
Submitted: 2019-02-22 15:34:03

Co-authors: David L.Green, J. D. Lore, D. N. Smithe, J. R. Myra, Colin L. Waters

Contact Info:
University of Newcastle and Oak Ridge National Lab
1030 E Churchwell Avenue
Knoxville, TN   37917
USA

Abstract Text:
Robust coupling of RF power to the core of fusion plasmas is essential for reliable operation of future devices such as ITER. Achieving this goal requires understanding the interplay between the scrape off layer (SOL) properties, such as the density, and the RF power itself. The ponderomotive force can modify density in regions of electric field gradients, and may affect effective wave power delivery by pushing density away from RF actuators. This research looks at ponderomotive density modification via a 1D, parallel (B field aligned) transport solver, coupled with a 1D RF cold plasma wave solver. To maintain simplicity, constant temperature is assumed and the two fluid equations (continuity and momentum) are solved using an implicit-explicit (IMEX) scheme on a staggered cartesian grid. Here we present results of the coupled model for a parallel ponderomotive force and discuss progress towards the inclusion of perpendicular components.

*Work supported by the U.S. Department of Energy Scientific Discovery through Advanced Computing Initiative, Contract Number DE-AC05-00OR22725.

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