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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3710
DTSTART:20150504T170000Z
DTEND:20150504T180000Z
DTSTAMP:20260419T124503Z
LAST-MODIFIED:20150416T210542Z
LOCATION:1610 Engineering Hall
SUMMARY:43 years of fun basic plasma experiments\, Plasma Physics (Phy
 sics/ECE/NE 922) Seminar\, Noah Hershkowitz \, UW-Madison
DESCRIPTION:This talk will present an overview of some of the most enj
 oyable low-temperature plasma experiments I have carried out with my s
 tudents over the course of my career. It will begin with the connectio
 n between solitons and the Schrödinger equation\, and continued with 
 the discovery of cylindrical and spherical soliton-like structures. Fr
 om moving structures we will progress to stable ones: sheaths and doub
 le layers. Where do double layers form? How can we measure double laye
 r potentials? These questions lead to the development of emissive prob
 e techniques. From there we will move on to the Bohm criterion and the
  first measurements of the full plasma potential variations of sheaths
  and presheaths in a single-species plasma\, and later in two-ion-spec
 ies plasmas. Finally\, our recent measurements of double layers and pr
 esheaths in uniform helicon plasma will be presented\, which address t
 he earlier unresolved question of where double layers form.
URL:https://www.physics.wisc.edu/events/?id=3710
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