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Description
High Energy Photon Source (HEPS) is a 6 GeV synchrotron light source with ultra-low electron beam emittance and a kilometer scale circumference. It has been proposed by IHEP and is planned to be built in Beijing from late 2018. Six PETRA-type 5-cell 500 MHz copper cavities will be used in the booster ring to provide 8 MV RF voltage and 60 kW of beam power. Each cavity will be powered by a 100 kW solid-state amplifier. For the storage ring, a double-frequency RF system has been adopted with 166.6 MHz as the fundamental while 499.8 MHz as the third harmonic. Five 166.6 MHz superconducting cavities will provide the required 5.5 MV RF voltage and 900 kW of beam power. Each cavity will be driven by a 250 kW solid-state amplifier using one single-window coaxial-type fundamental power coupler. The harmonic cavity, on the other hand, is planned to use single-cell 500 MHz elliptical SRF cavity, while its power amplifier will also make use of solid-state technology but its power is to be determined depending on whether an active or a passive harmonic system will be used. This paper describes the high power RF system for the HEPS project.