Page 10 - Jet Outflow and Open Field Line Measurements on C-2U Device
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Stabilizing the FRC Target
• Low order modes important in FRCs
• N=1 “tilt” mode
• Stabilized by kinetic effects
• Control parameters to obey empirical S*/E < 3 stability criterion
• N=2 “rotational” mode
• Traditionally stabilized by quadrupole saddle coil field
• Original C-2 concept and experiment, 2008-2010
• Asymmetry in field deconfines fast ions from NB injection
• Now stabilized by end biasing
• GDT (Budker INP) reported low order flute mode stabilization by end biasing with a
plasma gun, c2010
• TAE applies plasma gun end biasing 2010-present
• Axisymmetric stabilization of N=2 – allows NB heating
• N=1 “wobble” mode
• Destabilized by biasing at a single end • Stable in usual operation
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