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Power threshold

In the empirical model developed by Y. Shimomura [1], it is assumed that plasma makes a transition from L-mode to H-mode when the power crossing the separatrix (tex2html_wrap_inline376) rises above a power threshold (tex2html_wrap_inline378):
The power threshold for the transition to H-mode is calculated using the following formula,
where AH is the hydrogenic mass in AMU, tex2html_wrap_inline382 is the vacuum toroidal magnetic field at major radius R along the flux surface in Tesla, R is the major radius in meters, tex2html_wrap_inline388 is the line average density in units of 1020 m-3 and a is the minor radius in meters. The RMS deviation of this model is 27%.

Wed Apr 2 12:00:26 EST 2003