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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-3321
DTSTART:20140505T170000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T175311Z
LAST-MODIFIED:20140423T172203Z
LOCATION:2241 Chamberlin
SUMMARY:HIT-SI Results\, Plasma Physics (Physics/ECE/NE 922) Seminar\,
  Brian Nelson\, University of Washington\, Seattle
DESCRIPTION:Steady inductive helicity injection (SIHI) current drive p
 roduces spheromaks with up to 90 kA toroidal current\, and plasma curr
 ent to injector current ratios of up to 3.8\, in the Helicity Injected
  Torus-Steady Inductive (HIT-SI) experiment.  Unlike most helicity inj
 ection methods\, SIHI directly applies a periodic non-axisymmetric dis
 tortion\, called Imposed Dynamo Current Drive (IDCD).  IDCD eliminates
  the need for the plasma itself to produce non-axisymmetric relaxation
  mechanisms\, and furthermore can be used to sustain a kink-stable equ
 ilibrium. HIT-SI creates and sustains spheromaks with equilibrium reco
 nstructions (fitting to internal magnetic field measurements) that are
  ideally n=1 kink-stable.  Furthermore\, at injector frequencies great
 er than the inverse sound transit time\, equilibrium fits to internal 
 magnetics show pressure confinement with high beta\, as well as exhibi
 ting both an outward shift of the magnetic axis and improved toroidal 
 symmetry.  The high efficiency of IDCD sustaining stable equilibria wi
 th high beta\, enables spheromak reactor designs with overnight capita
 l costs competitive with present power-generating plants.
URL:https://www.physics.wisc.edu/events/?id=3321
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