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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3781
DTSTART:20151130T180000Z
DTEND:20151130T190000Z
DTSTAMP:20260419T110707Z
LAST-MODIFIED:20150911T190809Z
LOCATION:2241 Physics Bldg 
SUMMARY:MHD SIMULATIONS IN DEVICES WITH COMPLEX 3D BOUNDARIES: THE PSI
 -TET CODE AND ITS APPLICATION \, Plasma Physics (Physics/ECE/NE 922) S
 eminar\, Christopher Hansen\, University of Washington
DESCRIPTION:In MagnetoHydroDynamic (MHD) simulations of Magnetic Confi
 nement Fusion (MCF) experiments the first wall is often treated as a c
 ontinuous\, symmetric surface. However\, even in machines with a high 
 degree of plasma symmetry\, the true first wall is complex. Perforatio
 ns required for diagnostic\, heating\, and current injection ports and
  localized stabilizing plates all effect induced-currents in the wall\
 , modifying the behavior of resistive wall modes and scrape-off layer 
 currents.<br>
\n<br>
\nThe PSI-Tet code is a new 3D extended MHD code 
 based on an unstructured tetrahedral grid that allows arbitrary device
  geometry to be captured. This code employs a high order finite elemen
 t method using a novel discretization for magnetic flux based on Nedel
 ec basis functions. A fully implicit centered time advance (Crank-Nico
 lson) is used and solved with a multigrid preconditioned Newton-Krylov
  method. In this talk progress and results will be presented from two 
 applications of PSI-Tet: 1) Detailed validation studies of the HIT-SI 
 experiment with self-consistent modeling of plasma dynamics in the hel
 icity injectors. Results will be compared to experimental data and NIM
 ROD simulations that model the effect of the helicity injectors throug
 h boundary conditions on an axisymmetric domain. 2) Simulations of ext
 ernal kink dynamics in the HBT-EP experiment with different wall confi
 gurations\, focusing on toroidal asymmetries in the adjustable conduct
 ing wall. A brief description of the PSI-Tet code will also be present
 ed focusing on unique features of the code. 
URL:https://www.physics.wisc.edu/events/?id=3781
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