IGF::OT::IGF HIGH POWER NUCLEAR FUSION PROPULSION SYSTEMS WILL REQUIRE HIGH EFFICIENCY RADIO-FREQUENCY HEATING SYSTEMS IN THE MHZ RANGE FOR PLASMA HEATING. THIS PROPOSAL IS FOR A NOVEL SCALABLE SOLID STATE CLASS E AMPLIFIER USING SILICON CARBIDE SWITCHING TRANSISTORS FOR PLASMA HEATING. THIS SYSTEM IS POTENTIALLY 100% EFFICIENT COMPARED TO 40% FOR LINEAR AMPLIFIERS AND CAN BE SCALED TO ANY DESIRED SIZE BY ADDING ADDITIONAL SEGMENTS IN PARALLEL. THE SYSTEM INCLUDES A NOVEL CLOSED LOOP FEEDBACK CONTROL SYSTEM AT THE ANTENNA AND FROM THE PLASMA. THIS ELIMINATES THE NEED FOR LOSSY TRANSFORMERS AND OTHER NON-IDEAL COMPONENTS. THE RF AMPLIFIER WILL BE PROTOTYPED IN PHASE I IN PREPARATION FOR A PLASMA HEATING EXPERIMENT IN PHASE II.