Speaker
Description
The FRIB LLRF controller was developed as a flexible hardware platform for multiple cavity types operating at six RF frequencies from 40.25 to 322 MHz. Key choices—direct RF sampling, compatible footprints for frequency-dependent RF components, common PCB form factors, and spare RF, analog, and digital I/O—enabled reuse across diverse systems. The platform supports several tuner technologies, including stepper-motor, piezoelectric, and pneumatic tuners. Integrated pneumatic valve control and monitoring proved valuable during commissioning and operations. As FRIB needs evolved, the controller accommodated unforeseen requirements, including bias-tee high-voltage supply control, serial links to tuner servo controllers, and cold-cathode gauge monitoring for faster interlock response. More recently, it supported SLAC LCLS-II e-gun testing with piezo tuner control and is being evaluated for the K500 cyclotron RF control upgrade, which requires continuous coverage from 10 to 27 MHz. This presentation shows how modular design, hardware margin, and tuner-control flexibility transformed a project-specific LLRF controller into a versatile platform for future accelerator RF applications.
Funding Agency
Work supported by the U.S. Department of Energy, Office of Science under Cooperative Agreement DE-SC0023633, the State of Michigan, and Michigan State University.
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