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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-8874
DTSTART:20240916T170500Z
DTEND:20240916T180000Z
DTSTAMP:20260413T184633Z
LAST-MODIFIED:20240826T223924Z
LOCATION:1610 Engineering Hall
SUMMARY:Hot Electron Instabilities in Magnetic Mirrors and Dipoles\, P
 lasma Physics (Physics/ECE/NE 922) Seminar\, Prof. Michael Mauel\, Col
 umbia University
DESCRIPTION:The dedication of the new WHAM experiment\, having world-r
 ecord magnetic field strength\, has generated renewed interest in magn
 etic mirror plasma confinement for fusion applications. Beginning in t
 he early 1960's when Ray Dandl (ORNL) discovered how to efficiently co
 uple microwaves near the electron cyclotron frequency to a mirror-conf
 ined plasma\, several mirror and mirror-like experiments have observed
  hot electron instabilities. These instabilities are often violent and
  always beautifully interesting. Common to axisymmetric magnetic mirro
 rs\, bumpy tori\, and levitated dipoles\, hot electron instabilities a
 lways appear when the fraction of energetic electrons exceeds some thr
 eshold. In contrast\, minimum-B magnetic mirrors have only whistler in
 stabilities but do not have hot electron instabilities [Garner\, PRL 1
 987]. When conditions are adjusted so that the hot electron fraction i
 s low\, the plasma is much colder and drift instabilities appear. Exam
 ples discussed include Shinji Hiroe's "Observation of hot electron rin
 g instabilities in ELMO Bumpy Torus" [POF 1984]\, observations from th
 e TARA tandem mirror [IAEA-CN-44/CI-4\, 1984]\, from the Collisionless
  Terrella Experiment [Ben Levitt\, POP 2002]\, and from the Levitated 
 Dipole Experiment [Darren Garnier\, POP 2006].
URL:https://www.physics.wisc.edu/events/?id=8874
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