April 4-6

Log in

Abstract Details

files Add files

status:file name:submitted:by:
approvedcch_sherwood2016.pdf2016-04-07 14:23:11Chris Hegna


Author: Chris Hegna
Requested Type: Poster
Submitted: 2016-02-12 12:26:27


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

Abstract Text:
The impact of sheared toroidal rotation on the evolution of pressure driven magnetic islands in tokamak plasmas is investigated using a resistive MHD model. Particular attention is paid to the asymptotic
matching data as the large and small solutions of the Frobenious expansion are altered in the presence of sheared flow. Analysis of the nonlinear island Grad-Shafranov equation using asymptotic expansions based only on a small island expansion shows that sheared flows tend to amplify the stabilizing pressure/curvature contribution to saturated pressure driven islands in toroidal tokamaks. Island bootstrap current contributions to nonlinear island evolution are unaffected by the sheared toroidal flow. As such, sheared toroidal rotation tends to reduce the pressure drives for nonlinear island growth in a tokamak and lead to lower saturated island widths.