S. Lahiri et al., A CONDITION FOR SETTING UP ULTRA-LOW Q(A) DISCHARGES IN THE SINP TOKAMAK, IEEE transactions on plasma science, 25(3), 1997, pp. 509-512
The required rate of plasma current rise for setting up ultra-low q(a)
, (ULQ) discharges have been quantified for the first time. It is obse
rved that the rate depends inversely on the value of the mode rational
barrier to be crossed. The empirical relation obtained has important
consequences as regards setting up of such discharges and design of UL
Q devices.