Abstract
Lower hybrid (LH) wave has been widely used for non-inductive current drive in modern tokamak experiments with high power injection. LH parametric instability (PI) has been observed in many LH experiments and considered as the most likely candidate which causes the decrease of LH current drive efficiency. Traditional LH PI theories are mostly based on the electrostatic model given the fact that the slow wave branch in LH frequency range is a quasi-electrostatic wave. However, electrostatic description is not accurate for the plasma parameters of scraped-off layer(SOL) region where LH PIs are observed in current fusion experiments. Thus, in this work, we include the electromagnetic correction for slow wave and build up the corresponding nonlinear dispersion relation of PI. The electromagnetic effects on two major decay channels, i.e., ion sound quasi-mode (ISQM) and ion cyclotron quasi-mode (ICQM) are discussed.
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