BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:0 UID:UW-Physics-Event-5385 DTSTART:20200217T180500Z DTEND:20200217T185500Z DTSTAMP:20260415T040928Z LAST-MODIFIED:20200212T214124Z LOCATION:2241 Chamberlin Hall SUMMARY:Understanding\, Predicting\, and Manipulating Reduced Transpor t Regimes in Fusion Plasmas\, Plasma Physics (Physics/ECE/NE 922) Semi nar\, David Hatch\, Institute for Fusion Studies\, University of Texas at Austin DESCRIPTION:Following a half century of extraordinary progress in plas ma magnetic confinement via tokamaks\, with\, for example\, the fusion triple product increasing at a rate surpassing Moore’s law\, magnet ic confinement finds itself poised on the brink of high fusion gain. T he narrow transport barrier that forms at the edge of an H-mode fusion plasma will\, perhaps\, be the largest determining factor in making t he final step to a burning plasma. This transport barrier arises when the conventional plasma turbulence mechanisms are suppressed. This all ows a ‘pedestal’—a region of steep pressure gradients—to form\ , drastically boosting the plasma confinement. ITER\, and nearly all o ther prospective burning plasma devices\, are designed to exploit edge transport barriers to achieve their goals.
\nThis talk presents recent breakthroughs in understanding and predicting the ‘residualâ €™ turbulence in transport barriers\, which has been difficult to mode l due to the extreme conditions characteristic of a transport barrier. I will survey the classes of fluctuations that remain in transport b arriers\; describe how high performance computing is enabling unpreced ented physics understanding\; discuss how pedestal transport may extra polate to unfamiliar parameter regimes (e.g.\, ITER)\; and describe co nnections between transport barriers in tokamaks and stellarators. Th e developing capacity to understand\, predict\, and manipulate turbule nt transport has the potential to enable the realization of optimized configurations that will enable fusion gain on faster time scales and at greatly reduced cost. URL:https://www.physics.wisc.edu/events/?id=5385 END:VEVENT END:VCALENDAR