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Author: Ian J Waters
Requested Type: Poster
Submitted: 2017-03-16 11:29:07

Co-authors: H. Frerichs, S. Silburn, J. Harrison, A. Kirk, O. Schmitz

Contact Info:
University of Wisconsin-Madison
1500 Engineering Drive Office
Madison, WI   53706
United States

Abstract Text:
The EMC3-EIRENE edge plasma fluid and neutral kinetic transport code is being used to investigate the applicability of 3D non-axisymmetric fields for density control in standard and advanced divertor configurations in spherical tokamaks. This modeling effort is focusing on methods for density control in long pulse, high performance plasmas at the National Spherical Tokamak Experiment-Upgrade. Unique experimental measurements of Scrape Off Layer (SOL) flow structures at the Mega Ampere Spherical Tokamak (MAST) present an ideal laboratory for comparison and interpretation with simulation results to inform these larger studies. A Coherence Imaging Spectroscopy (CIS) diagnostic was deployed for the MAST 2013 scientific campaign, during which flow measurements were taken of high field side fueling experiments that show the appearance of field-aligned counter streaming flows around the center column. These experiments have motivated a simulation effort with EMC3-EIRENE to better understand this phenomena. Comparisons between the three dimensional simulation results and idealized one dimensional models of SOL flux tubes are used to understand the role of parallel pressure gradients in driving flows. Further, these comparisons highlight the role of crossfield transport in damping localized flows in the SOL. This work was funded by the US Department of Energy under grant DE-SC0012315.

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