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A theoretical study of the improvement of the Electron Cyclotron CurrentDrive (ECCD) efficiency in regimes where most of the current is driven by LowerHybrid (LH) waves is presented. A perturbation technique is employed to solvethe adjoint equation and derive the response function including bothcollisional and LH effects in the limit where the former dominate. Analternative treatment of the problem, involving a numerical solution of theLangevin equations is proposed to gain insight into the current drive mechanismand confirm the obtained results. The existence of a cross-effect between thetwo waves is demonstrated and the conditions for the synergy, i.e. significantenhancement of the ECCD efficiency in the presence of LH power, are identified.Comment: 34 pages, 14 figures, submitted to Phys. Plasma

Theory of synergy between electron cyclotron and lower hybrid waves