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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8274
DTSTART:20230512T150000Z
DTEND:20230512T170000Z
DTSTAMP:20260414T033135Z
LAST-MODIFIED:20230508T144720Z
LOCATION:https://uwmadison.zoom.us/j/94917998530?pwd=Qk5aWnpPeVFNVDhTR
 WpPbjZudXlXdz09
SUMMARY:Pressure-driven tearing and energy transport in finite beta Re
 versed Field Pinch computations\, Graduate Program Event\, Urvashi Gup
 ta\, Department of Physics Graduate Student
DESCRIPTION:Pressure-driven effects on magnetic relaxation dynamics an
 d energy transport of an inductively-driven Reversed-Field Pinch devic
 e are investigated in a 3D cylindrical magnetohydrodynamics model. Pre
 ssure-driven dynamics in RFPs are often assumed to be small. However\,
  unfavorable average curvature in RFPs means that pressure does influe
 nce tearing and consequently transport along stochastic field lines. I
 n this work\, nonlinear NIMROD computations are applied to model the R
 FP at experimentally relevant plasma-$\\beta$ values. Self-consistent 
 evolution of fluctuations from an Ohmic steady state that includes the
 rmal conduction and heating results in tearing dominant relaxed states
  with sustained reversal. Linear computations are applied to profiles 
 extracted from the relaxed nonlinear state to study the sources of fre
 e energy for the fluctuations. The parallel current drive and pressure
 -curvature drive for the obtained linear eigenfunctions are found to b
 e comparable and only the sum of both the terms surpasses the stabiliz
 ing contribution to drive tearing modes. Energy transport via fluctuat
 ion-induced conduction and convection is computed for the nonlinear re
 laxed states and qualitative agreement with recent experimental result
 s is observed. The heat flux densities are further decomposed to asses
 s the significance of different orders of correlations. The implicatio
 ns of artificial particle diffusion on convective transport and the ov
 erall relaxed state are also discussed for this self-consistent MHD mo
 del.
URL:https://www.physics.wisc.edu/events/?id=8274
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