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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8478
DTSTART:20231208T193000Z
DTEND:20231208T213000Z
DTSTAMP:20260414T025148Z
LAST-MODIFIED:20231025T164724Z
LOCATION:2301 Sterling
SUMMARY:Detection and Characterization of Core Magnetic Fluctuations o
 n DIII-D using Faraday-Effect Polarimetry\, Graduate Program Event\, R
 achel Myers\, Department of Physics Graduate Student
DESCRIPTION:Internal\, resistive MHD instabilities called tearing mode
 s (TMs) significantly contribute to disruptions and confinement degrad
 ation in tokamaks. Measuring nonlinear TM coupling with high m/n near 
 the magnetic axis can aid in understanding neoclassical TM seeding\, g
 rowth\, and decay. For this tracking\, we use the Radial Interferomete
 r-Polarimeter (RIP)\, which is sensitive to core-resonant magnetic flu
 ctuations on DIII-D and has detected TMs well before they appear on ed
 ge magnetic sensing coils [Pandya\, DPP invited talk 2021]. Here we em
 ploy RIP to analyze the impact on pre-existing TMs of multiple\, emerg
 ing MHD modes that are never detected by the coils. In one example\, R
 IP detects a higher-frequency mode coupled to both an n=2 mode and a l
 ower-frequency mode that later diminishes. All three modes are resonan
 t near the magnetic axis\, and their interaction is only visible using
  RIP. In this talk we will also discuss tearing mode structure and its
  potential effects on RIP-measured tearing mode amplitudes.<br>\n<br>\
 nZoom link: https://uwmadison.zoom.us/j/4794656813 
URL:https://www.physics.wisc.edu/events/?id=8478
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