Fenstermacher Electron Cyclotron Resonance
iefrf/iefrffix= 3 $$ \text{Current drive efficiency [A/W]} = \frac{0.21 T_{\langle e,n_{\text{e}} \rangle}}{R_0n_{\text{e,20}}(31.0-(\log{n_{\text{e}}}/2)+(\log{(T_\text{e}}\times1000))} $$
iefrf/iefrffix = 3
$$
\text{Current drive efficiency [A/W]} = \frac{0.21 T_{\langle e,n_{\text{e}} \rangle}}{R_0n_{\text{e,20}}(31.0-(\log{n_{\text{e}}}/2)+(\log{(T_\text{e}}\times1000))}
$$