50 kV Klystron Driver for Fusion Science Applications

Eagle Harbor Technologies, Inc. (EHT) is developing a new, solid-state klystron driver for use in fusion science applications. EHT is using high-frequency SiC MOSFET-based full bridges, previously developed with support of the DOE SBIR program. These full bridges drive a resonant circuit that allows for zero current switching, reducing the stress on the solid-state switches. The high frequency operation allows a more compact system, which can be placed closer to the klystrons. The Phase I program focused on a demonstration of 50 kV operation with low output voltage ripple (\textless 1{\%}) and minimizing stored energy in the output filter (\textless 2 J). During a klystron fault, this energy is deposited into the klystron. Minimizing the stored energy is a more robust, passive solution that allows for the removal of additional switching components to protect the klystron. EHT will present the Phase I results. In a potential Phase II program, EHT will build and deliver a 50 kV, 600 kW klystron driver to MIT for testing.