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Edge physics in next generation 3D devices

Author: Aaron Bader
Requested Type: Poster Only
Submitted: 2014-05-30 15:16:07

Co-authors: D.T. Anderson, Y. Feng, H. Frerichs, C.C. Hegna, O. Schmitz, J.N. Talmadge

Contact Info:
University of Wisconsin-Madison
1500 Engineering Drive, 511 ER
Madison, WI   53706
USA

Abstract Text:
Solving the ``edge problem'' is a major challenge in the next generation of 3D devices. The edge problem consists of keeping heat flux to plasma facing components below a critical level, preventing the penetration of impurities into the core plasma, allowing for the pumping of exhausted helium ash from the core and influx of fuel into the core. In this poster we examine various issues related to the heat flux deposition in a 3D stellarator surrounded by a island structures using the coupled codes EMC3-EIRENE. The role of island size is investigated and in the limit of large island size, the simple physics picture familiar from tokamak physics is recovered. Namely, a high recycling regime is achieved at sufficiently high separatrix densities due to the minimization from momentum loss from counter-streaming flows. Additionally, alternative configurations generated by adding or modifying coils are examined. The resulting magnetic configurations are simulated both with EMC3-EIRENE and simple strike point mapping calculations.

Characterization: 3.0

Comments:

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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