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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3776
DTSTART:20151019T170000Z
DTEND:20151019T180000Z
DTSTAMP:20260419T110347Z
LAST-MODIFIED:20151006T202243Z
LOCATION:2241 Physics Bldg 
SUMMARY:The JET-ILW Pedestal and the Fate of the H-mode\, Plasma Physi
 cs (Physics/ECE/NE 922) Seminar\, David Hatch\, Institute for Fusion S
 tudies\, UT Austin
DESCRIPTION:The tokamak H-mode is defined by a narrow insulating regio
 n—the pedestal—at the plasma edge where turbulence is suppressed a
 nd sharp pressure gradients develop.  The properties of the pedestal l
 argely determine the quality of confinement and are also closely conne
 cted to issues of heat exhaust and plasma material interaction.  The p
 edestal is\, therefore\, at the center of the most pressing issues fac
 ing fusion energy.  I will describe recent progress in understanding t
 he dynamics of turbulence and transport in the singularly ITER-relevan
 t JET-ILW (ITER-like wall) pedestal\, where unexpected pedestal proper
 ties are responsible for a significant degradation in performance.  Gy
 rokinetic simulations using the GENE code identify the microtearing mo
 de to be the dominant transport mechanism in the pedestal.  Nonlinear 
 simulations demonstrate the capacity of microtearing turbulence to acc
 ount for the observed experimental heat fluxes.  The capabilities and 
 insights developed in this work are used to infer possible consequence
 s for pedestal properties on ITER\, including the possibility that ITE
 R may be in a pedestal regime foreign to present-day experiments.
URL:https://www.physics.wisc.edu/events/?id=3776
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