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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:5
UID:UW-Physics-Event-4909
DTSTART:20181001T170500Z
DURATION:PT1H0M0S
DTSTAMP:20240329T105639Z
LAST-MODIFIED:20180928T140407Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Understanding Heavy Ion Impurity Transport in Tokamaks\, Plasm
a Physics (Physics/ECE/NE 922) Seminar\, Dr. Emily Belli\, General Ato
mics
DESCRIPTION:In a fusion reactor\, the transport of heavy impurities\,
such as tungsten from material surfaces\,
\ninto the high-temperature
core must be minimized since accumulation can lead to fuel dilution an
d radiation losses\, ultimately degrading the energy confinement and f
usion performance. Assessing the level of core accumulation requires s
ophisticated transport models beyond those typically use for studying
the main ions and plasmas with low-Z impurities. In particular\, centr
ifugal effects due to sonic rotation\, which arises in tokamaks from t
orque due to neutral beam injection for plasma heating\, can lead to s
ignificant modifications to the simulated transport of heavy impuritie
s. The lack of sonic rotation effects in most theoretical models means
that widely-used reduced models are inadequate for studying heavy imp
urities and thus computationally-intensive advanced kinetic codes are
needed. In this work\, we use state-of-the art gyrokinetic (turbulent)
and neoclassical (collision) codes to develop an understanding of the
physical mechanisms driving the particle transport of tungsten in tok
amaks and how tungsten accumulation can be avoided
\n
\nCospon
sored by a generous grant from the Women in Science & Engineering Lead
ership Institute ( WISELI)
URL:https://www.physics.wisc.edu/events/?id=4909
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