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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-2736
DTSTART:20121126T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T151748Z
LAST-MODIFIED:20121114T143906Z
LOCATION:1310 Sterling Hall
SUMMARY:Observing the acceleration of suprathermal electrons by Alfven
  waves using the diagnostic of whistler-mode wave absorption\, Plasma 
 Physics (Physics/ECE/NE 922) Seminar\, Fred Skiff\, University of Iowa
DESCRIPTION:Shear Alfven waves are believed to accelerate plasma elect
 rons through both linear and nonlinear wave-particle interactions.  In
  the LAPD plasma device wave packets of nearly-periodic plane waves wi
 th dB/B~10E-5 are generated using an arbitrary spatial waveform antenn
 a in the central region of the plasma.  When the perpendicular wavelen
 gth is shortened to a few times the collisionless skin depth a paralle
 l electric field is produced that should be able to accelerate plasma 
 electrons.  The difficulty in observing these electrons is that the ch
 ange to the distribution function is small and should be greatest at h
 igh velocity where the total number of particles is small.  Preliminar
 y results of using whistler-mode wave absorption as a diagnostic of th
 e suprathermal electrons indicate that it is indeed possible to observ
 e the effects produced by electron acceleration.  We will discuss the 
 problems of separating out the effect of changes in the bulk plasma de
 nsity (including ducting) from the effects of wave damping (of the whi
 stler-mode wave) that enable us to measure the perturbed electron velo
 city distribution to high resolution.
URL:https://www.physics.wisc.edu/events/?id=2736
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