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Description
The 10 MHz RF system of the Proton Synchrotron (PS) at CERN will undergo a major upgrade during the Long Shutdown 3 (LS3). During this time, the existing tube-based driver amplifiers—whose production ended in 2022—are being replaced with a new solid-state design based on GaN technology. In order to ensure the same reliability as the rad-hard vacuum tubes in the PS radiation environment, the solid state amplifier must undergo radiation qualification campaigns. The design of the prototype amplifier has been engineered both to consolidate the existing system and to reduce the group delay of the entire RF chain, with the aim of reducing the longitudinal beam coupling impedance. This paper presents the design, development, and preliminary testing of the first GaN-based driver amplifier prototype, as well as its integration within the existing RF power system and the results obtained.
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