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SUMMARY:Physics of the Tokamak Pedestal\, and Implications for Magnetic Fu
 sion Energy
DTSTART:20190114T103000
DTEND:20190114T113000
DTSTAMP:20260916T014034Z
UID:7ba3a3026f072d21a2b3fffd27ea0e326567eb48a36c7d966ead2ded
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Phil Snyder\, Theory & Computational Science Department 
 at General Atomics\, San Diego\, USA\nFusion\, the process that powers the
  stars\, offers the potential to provide plentiful clean energy here on ea
 rth.  Magnetic confinement of high temperature (> 100 million degrees C) 
 plasmas in toroidal devices known as tokamaks is a promising approach to f
 usion\, one that has successfully produced millions of watts of fusion pow
 er. High performance in tokamaks is achieved via the spontaneous formation
  of a transport barrier in the outer few percent of the confined plasma. 
   This narrow insulating layer\, referred to as a “pedestal\,” typica
 lly results in a >30x increase in pressure across a 0.4-5cm layer. Predict
 ed fusion power scales with the square of the pedestal top pressure (or 
 “pedestal height”)\, hence a fusion reactor strongly benefits from a h
 igh pedestal\, provided this can be attained without large Edge Localized 
 Modes (ELMs)\, which may erode plasma facing materials. The overlap of dri
 ft orbit\, turbulence\, and equilibrium scales across this narrow layer le
 ads to rich and complex physics\, and challenges traditional analytic and 
 computational approaches.  Development of high resolution diagnostics\, a
 nd coordinated experiments on several tokamaks\, have validated understand
 ing of important aspects of the physics\, while highlighting open issues.
   A predictive model (EPED) has proven capable of predicting the pedestal
  height and width to ~20-25% accuracy in large statistical studies. This m
 odel was used to predict a new\, high pedestal “Super H-Mode” regime\,
  which was subsequently discovered on DIII-D\, leading to high fusion perf
 ormance\, and motivated experiments on Alcator C-Mod which achieved world 
 record\, reactor relevant pedestal pressure. These observations build conf
 idence in predictions for ITER\, a new tokamak under construction in Franc
 e\, and provide a path that\, coupled to advances in fusion materials and 
 engineering\, could lead to attractive fusion reactors.
LOCATION:PPB 019 https://plan.epfl.ch/?room=PPB019
STATUS:CONFIRMED
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