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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-3777
DTSTART:20151026T170000Z
DTEND:20151026T180000Z
DTSTAMP:20240329T072339Z
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
\nthat have been produced at UW-Madison over the la
st few years. In scope\,
\nthey cover a wide array of topics relat
ed to microinstabilities and
\nturbulence. The failure of ion-temp
erature-gradient-driven turbulence to
\nsaturate at large beta is
explained through field line decorrelation and
\nthe depletion of
zonal flows. Turbulent transport in the MST
\nreversed-field pinch
and the HSX stellarator are investigated: critical
\ngradients in
the former are lowered drastically by residual tearing mode
\nact
ivity\, whereas the latter exhibits nonlinear structure formation.
\nGeneric stellarator research reveals a rich spectrum of subdominant
\neigenmodes\, which in aggregate govern transport characteristic
s and
\nwhich have to be included in quasilinear transport modelin
g. Heating in
\nthe solar corona is studied through simulations of
turbulent
\nreconnection\, where heating rates match observations
and nanoflares can
\nbe explained by plasmoid mergers. A new plas
ma instability is presented\,
\nwhich\, in addition to affecting r
econnection rates\, appears to dominate
\npressure-gradient-driven
experiments at the LAPD device.
URL:https://www.physics.wisc.edu/events/?id=3777
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