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SEQUENCE:1
UID:UW-Physics-Event-6408
DTSTART:20210414T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T234157Z
LAST-MODIFIED:20210405T132749Z
LOCATION:https://uwmadison.zoom.us/j/91321209265?pwd=ekRmNEt0alNvOHMrV
 WVnTXhZRXVCQT09
SUMMARY:Stellarator Beta Limits with Extended MHD Modeling Using NIMRO
 D\, Thesis Defense\, Torrin Bechtel\, Physics PhD Graduate Student
DESCRIPTION:The nonlinear\, extended MHD code NIMROD is employed to si
 mulate self-consistent stellarator behavior at high beta.  Finite anis
 otropic thermal conduction allows for sustained pressure gradients wit
 hin stochastic regions.  The configuration under investigation is an l
 =2\, M=10 torsatron with vacuum rotational transform near unity.  Fini
 te-beta plasmas are generated from vacuum fields using a volumetric he
 ating source and temperature dependent resistivity.  With realistic pa
 rameters the configuration is unstable to interchange\, which acts to 
 limit the achievable beta.  Simulations performed in a single field pe
 riod domain do not exhibit a complete crash from the instability\, but
  otherwise closely match theorized linear and nonlinear interchange be
 havior.  In more dissipative regimes where instability is suppressed\,
  steady-state solutions are obtained.  A conventional equilibrium beta
  limit is observed due to pressure induced stochastic magnetic field f
 ormation. The parametric dependence of the equilibrium limit is examin
 ed in detail.  Equilibrium results are compared with several reduced m
 odels for effective collisional transport across stochastic magnetic f
 ields and with the HINT code. Collisionality independent models also a
 re investigated for more realistic parallel thermal conduction rates.

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 kRmNEt0alNvOHMrVWVnTXhZRXVCQT09
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URL:https://www.physics.wisc.edu/events/?id=6408
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