B.F. McMillan and R.L. Dewar 2006 Nucl. Fusion 46 477 doi:10.1088/0029-5515/46/4/008
B.F. McMillan1 and R.L. Dewar2
Show affiliationsBallooning modes are usually the most dangerous ideal MHD instabilities in stellarators, but the unstable ballooning modes often have such short perpendicular wavelengths that finite Larmor radius effects are sufficient to stabilize the plasma. We use semiclassical techniques to analyse this effect. In tokamaks the ignorable toroidal coordinate leads to a simple quantization of the ballooning mode, but this is not the case for stellarators. The ballooning mode dynamics in a stellarator model may possess a separation of timescales, in which case the system is integrable and quantization is straightforward, but we also present a method for determining marginal stability which is applicable to the non-integrable case.
52.55.Hc Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
52.55.Fa Tokamaks, spherical tokamaks
Issue 4 (April 2006)
Received 9 November 2005, accepted for publication 1 February 2006
Published 16 March 2006
B.F. McMillan and R.L. Dewar 2006 Nucl. Fusion 46 477
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