Nat Fisch and Hong Qin. J.
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By injecting LHCD in a low-density, low-Te, high resistivity plasma, and then relaxing and densifying in a high-n, high-Te,low resistivity plasma, an order-of-magnitude savings on circulating LH power might be had as well as the opportunity to inject the LHW at low density. In addition, the flow drive during rapid start up may exhibit unusual features due to the large Ohmic counter-current accompanying the large LH-induced current (perhaps the flow effects are additive)
Note: factors are multiplicative, so get factor of say several in high-Z or low Te (high resistivity), including and further factor of several in low-n. The higher peak power required is balanced by the higher current drive efficiency to the extent that low-n is utilized. Also, note that LHCD more realistic at low-n.
N. J. Fisch, J. Plasma Physics 76, 627 (2010)