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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-4998
DTSTART:20190304T180500Z
DURATION:PT1H0M0S
DTSTAMP:20260416T110545Z
LAST-MODIFIED:20190211T204223Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Ion-scale turbulence in the presence of a large magnetic islan
 d\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Lucas Morton\, UW-Ma
 dison
DESCRIPTION:Understanding the effect of magnetic field geometry on tur
 bulence is
\nimportant for both tokamaks and stellarators. The introdu
 ction of a
\nmagnetic island to a toroidal plasma might influence turb
 ulence in
\nseveral ways: directly through geometric effects or indire
 ctly through
\nmodifications to gradients that drive turbulence or flo
 ws that
\nsuppress turbulence. In an experiment on DIII-D tokamak\, we
  studied
\nthe response of ion-gyro-radius scale density fluctuations 
 using the
\nBeam Emission Spectroscopy (BES) diagnostic. Our results c
 onfirm
\nqualitative predictions of prior turbulence simulations\, esp
 ecially
\nthe reduction of turbulent fluctuations at the center of the
  island.
\nThis motivates dedicated simulations to understand the rela
 tive
\ncontribution of the various mechanisms by which magnetic geomet
 ry
\nimpacts turbulence in this situation.
URL:https://www.physics.wisc.edu/events/?id=4998
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