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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-4768
DTSTART:20180219T180500Z
DURATION:PT1H0M0S
DTSTAMP:20260419T040258Z
LAST-MODIFIED:20180219T142948Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Tokamak Disruption Simulation: Progress toward Comprehensive M
 odeling\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Prof. Carl Sov
 inec\, UW-Madison\, Engineering Physics
DESCRIPTION:Full-scale operation of the ITER experiment will produce p
 lasma thermal energy and releasable magnetic energy on the order of hu
 ndreds of mega-Joules.  Unplanned disruptions to these discharges will
  be capable of causing significant material damage to plasma-facing co
 mponents and structures.  Efforts to understand disruptive dynamics\, 
 and to engineering mitigation systems\, include the development of com
 prehensive numerical models that can make predictions without destruct
 ive testing.  In this presentation\, previous efforts for simulating d
 ifferent forms of disruption are reviewed\, and a relatively recent ef
 fort\, based on the NIMROD code (https://nimrodteam.org) is presented.
   We find that the modeling of heat flux at the domain boundary has mo
 re significance than the modeling of particle flux for the evolution o
 f global parameters and for the longevity of the simulated discharge. 
  Fully three-dimensional simulations show that surface contact enhance
 s instabilities which develop near the plasma surface\, and these asym
 metries lead to net horizontal forcing on the chamber wall.  These res
 ults also highlight the importance of physical effects at the boundary
  of the modeled region.  Plans for including more realistic boundary e
 ffects are discussed.
URL:https://www.physics.wisc.edu/events/?id=4768
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