Abstract
The mechanism for the switching off of the lower hybrid current drive in the FT-2 tokamak is studied. It is shown that the lower hybrid wave-driven current is switched off when a parametric instability, which causes lower hybrid waves to decay into slowed waves interacting with plasma ions, develops at the plasma periphery. The onset of a parametric instability is attributed to the fact that the electron temperature falls off in the course of discharge, thereby lowering the instability threshold.
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