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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3777
DTSTART:20151026T170000Z
DTEND:20151026T180000Z
DTSTAMP:20260417T101904Z
LAST-MODIFIED:20151012T203112Z
LOCATION:2241 Physics Bldg 
SUMMARY:Badger Gyrokinetics: Recent Advances in Plasma Microturbulence
 \, Plasma Physics (Physics/ECE/NE 922) Seminar\, M.J. Pueschel\, Physi
 cs\, UW
DESCRIPTION:This presentation gives an overview of select gyrokinetics
 -based results<br>
\nthat have been produced at UW-Madison over the la
 st few years. In scope\,<br>
\nthey cover a wide array of topics relat
 ed to microinstabilities and<br>
\nturbulence. The failure of ion-temp
 erature-gradient-driven turbulence to<br>
\nsaturate at large beta is 
 explained through field line decorrelation and<br>
\nthe depletion of 
 zonal flows. Turbulent transport in the MST<br>
\nreversed-field pinch
  and the HSX stellarator are investigated: critical<br>
\ngradients in
  the former are lowered drastically by residual tearing mode<br>
\nact
 ivity\, whereas the latter exhibits nonlinear structure formation.<br>
 
\nGeneric stellarator research reveals a rich spectrum of subdominant
 <br>
\neigenmodes\, which in aggregate govern transport characteristic
 s and<br>
\nwhich have to be included in quasilinear transport modelin
 g. Heating in<br>
\nthe solar corona is studied through simulations of
  turbulent<br>
\nreconnection\, where heating rates match observations
  and nanoflares can<br>
\nbe explained by plasmoid mergers. A new plas
 ma instability is presented\,<br>
\nwhich\, in addition to affecting r
 econnection rates\, appears to dominate<br>
\npressure-gradient-driven
  experiments at the LAPD device.
URL:https://www.physics.wisc.edu/events/?id=3777
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