BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-4634
DTSTART:20171009T170000Z
DTEND:20171009T180000Z
DTSTAMP:20260419T004033Z
LAST-MODIFIED:20171002T125753Z
LOCATION:Chamberlin 2241
SUMMARY:Taming the plasma-material interface in plasma-burning nuclear
  fusion reactors\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Prof.
  Jean Paul Allain\, University of Illinois at Urbana-Champaign
DESCRIPTION:Although progress has been made in the last half-decade in
  establishing an understanding of plasma-material interactions (PMI)\,
  there remain critical knowledge gaps\, particularly predicting the be
 havior at the plasma-material interface under reactor-relevant fusion 
 plasma conditions in a future plasma-burning neutron-dominated environ
 ment. At this interface\, high particle and heat flux from the fusion 
 plasma can limit the material’s lifetime and reliability and therefo
 re hinder operation of the fusion device. This region is critical to o
 peration of a nuclear fusion reactor since material can be emitted bot
 h atomistically (e.g. through evaporation\, sputtering\, etc.) and/or 
 macroscopically (i.e. during transients events\, such as disruptions o
 r edge localized modes). The environmental conditions at the plasma-ma
 terial interface of a future nuclear fusion reactor interacting will b
 e extreme. The incident plasma will carry heat fluxes of the order of 
 100’s of MWm-2 and particle fluxes that can average 1024 m-2s-1. The
  fusion reactor wall would need to operate at high temperatures near 8
 00 C and the incident energy of particles will vary from a few eV ions
  to MeV neutrons. Another challenge is the management of damage over t
 he course of time. Operating at reactor-relevant conditions means the 
 wall material would need to perform over the course of not just second
 s or minutes (i.e. as in most advanced fusion devices today and in the
  near-future)\, but from months to years. Some promising breakthrough 
 concepts have been considered such as liquid walls and low-recycling r
 egimes that may address both radiation damage and the impact on the in
 teraction with the plasma edge and ultimately plasma core.  This talk 
 will focus on outlining both the challenges and promises of PMI resear
 ch in nuclear fusion today and the prospects for possible solutions fo
 r future plasma-burning fusion reactors.  The talk will in part summar
 ize the recent DOE Fusion Energy Sciences Workshop on Plasma-Material 
 Interactions and also highlight some of the recent work in Prof. Allai
 n’s RSSEL group at UIUC.
URL:https://www.physics.wisc.edu/events/?id=4634
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