BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:0 UID:UW-Physics-Event-3864 DTSTART:20151207T180000Z DTEND:20151207T190000Z DTSTAMP:20260419T110456Z LAST-MODIFIED:20151120T163202Z LOCATION:2241 Physics SUMMARY:Dusty plasmas for fundamental physics\, fusion\, semiconductor manufacturing\, and astronomy\, Plasma Physics (Physics/ECE/NE 922) S eminar\, John Goree\, University of Iowa DESCRIPTION:
\nBeyond the usual electrons and ions\, low-temperatu re plasmas can also contain charged particles of solid matter\, rangin g in size from nanometers to microns. They gain a large charge by coll ecting more electrons than ions from the ambient plasma. In fusion the se solid particles are found immersed in the plasma of the divertor re gion of tokamaks. In semiconductor manufacturing they are called “pa rticulates\,” and they grow spontaneously and represent a contaminat ion problem. Astronomers call these solid particles “dust\,” and t hey are found in the plasma of the interstellar medium where they are the precursors of terrestrial planets like Earth. In this talk I revie w these diverse examples of dusty plasma\, and then I present a fundam ental physics experiment intended to probe the extreme properties of p lasmas that are dominated by Coulomb collisions. A shear flow in this “strongly coupled” plasma results in localized viscous heating\, a phenomenon that has long been predicted theoretically for both plasm as and fluids but never observed until now. URL:https://www.physics.wisc.edu/events/?id=3864 END:VEVENT END:VCALENDAR