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A new synergy mechanism between Ohkawa current drive (OKCD) of electroncyclotron (EC) waves and lower hybrid current drive (LHCD) is discovered anddiscussed. And the methodology to achieve this synergy effect is alsointroduced. Improvement of OKCD efficiency can be achieved up to a factor of ~2.5 in far off-axis radial region (\r{ho} > 0.6) of tokamak plasmas. Making ECwave heating the electrons of co-Ip direction and LH wave heating the electronsof counter-Ip direction, the mechanism of this new synergy effect comes fromthe results of electron trapping and detrapping processes. The OKCD makes thelow speed barely passing electrons to be trapped (trapping process), the LHCDpulls some of the high speed barely trapped electrons out of the trapped regionin velocity space (detrapping process) and accelerates the detrapped electronsto a higher speed.

On Synergy effect of Ohkawa Current Drive of Electron Cyclotron Waves and Lower Hybrid Current Drive: A New Mechanism