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Description
This paper discusses the current progress of the 400 kW Solid-State Power Amplifier operating at 352 MHz for the European Spallation Source (ESS), developed by ESS in collaboration with Uppsala University. It details the initial measurements of critical components, including the Solid-State Power Amplifier (SSPA) module, which has a nominal output power of 1.6 kW.
The ESS plans to align 26 SSPA stations to power the superconducting cavities, with each station delivering a pulsed power of 400 kW. Achieving this high power level requires the integration of at least 264 SSPA modules, each with a nominal output power of 1.6 kW.
A power combining strategy using cavity combiners is utilized, initially integrating 64 SSPAs to reach the 100 kW level, and for additional redundancy, 80 modules are considered. Four 100 kW units are then combined in a secondary stage using a progressive combiner to achieve the 400 kW output level.
The design emphasizes efficiency and compatibility, maintaining a footprint identical to the existing tetrode station at ESS, approximately 4 square meters. The system is expected to achieve a high wall plug efficiency exceeding 65% and will operate at a 10% duty cycle to meet the future requirements of the ESSnuSB project.
