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UID:UW-Physics-Event-6119
DTSTART:20200921T170000Z
DURATION:PT1H0M0S
DTSTAMP:20260415T005624Z
LAST-MODIFIED:20200921T151210Z
LOCATION:Zoom Meeting
SUMMARY:Using Fundamental Turbulence Saturation to Improve Fast Transp
 ort Frameworks\, Plasma Physics (Physics/ECE/NE 922) Seminar\, M.J. Pu
 eschel\,  Dutch Institute for Fundamental Energy Research & Eindhoven 
 University of Technology
DESCRIPTION:Present-day simulation approaches for fusion plasmas can b
 e performed with an impressive degree of physics fidelity\, such as co
 vering the dynamics of all particle species and almost all of the plas
 ma volume at the same time. However\, at this level of realism\, exten
 ding a simulation to a single plasma confinement time would likely req
 uire all of our annual available computing resources. For important ta
 sks such as real-time control or confinement optimization\, we therefo
 re use reduced models that evaluate fluxes in seconds or less\, key am
 ong which rank quasilinear\, or mixing-length\, transport models\, som
 etimes in conjunction with neural networks. In this seminar\, quasilin
 ear models are explored and how one may use different techniques to im
 prove their predictiveness. A particular focus lies on recent successe
 s in using saturation theory in conjunction with turbulence simulation
 s to design corrections to the model that allow it to capture flux sca
 lings at high plasma beta and near the critical pressure gradient\, in
  the so-called Dimits regime. The physics of both of these scenarios h
 ave long eluded modelers and theorists\, and in providing a predictive
  framework\, we are able to identify the underlying physical mechanism
 s responsible for the complex observed behavior\, which is linked to t
 he nonlinear excitation of linearly stable eigenmodes.<br>
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URL:https://www.physics.wisc.edu/events/?id=6119
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