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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-4282
DTSTART:20161114T180000Z
DTEND:20161114T190000Z
DTSTAMP:20240319T122402Z
LAST-MODIFIED:20161107T175510Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Continuum-kinetic approach to sheath simulations\, Plasma Phys
ics (Physics/ECE/NE 922) Seminar\, Bhuvana Srinavasan\, Virginia Tech
DESCRIPTION:When plasma interacts with a surface\, a plasma sheath for
ms at the
\ninterface\, which is typically a region of net positiv
e space charge. Ions\, accelerated by the electric field in the sheath
region\, and hot electrons are known to cause emission from the surfa
ce. This can have consequences for devices such as Hall thrusters as e
lectron emissions can increase the rate of erosion of the electrodes a
ffecting performance and longevity of the thrusters – an important c
oncern for space-bound missions. The length-scale of sheaths is small
in comparison to the undisturbed plasma (on order of the Debye length)
yet the sheath has a global effect on plasma and needs to be included
self-consistently in computer simulations. This usually means resolvin
g the Debye length and the plasma oscillation frequency\, which makes
global and complex simulations extremely demanding in terms of the com
putational cost. Simulations of classical sheaths using a continuum k
inetic model are presented where we directly solve the
\nBoltzmann
equation for each of the ion and electron species using the discontin
uous Galerkin method.
URL:https://www.physics.wisc.edu/events/?id=4282
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