Speaker
Description
The Proton Radiation Effects Facility (PREF) was designed and constructed by the Institute of Modern Physics (IMP), Chinese Academy of Sciences. It aims to provide low to medium energy protons from 10-60 MeV, which is an excellent range for experimental research on the displacement damage effect studies. The facility uses a compact, four-vane RFQ with dual-port as its injector, powered by two 300 kW solid-state amplifiers (SSAs). The RF field stability requirement is ±1% for the amplitude during flat-top. To meet these requirements, a 325 MHz digital low-level RF control system has been developed based on a field-programmable gate array (FPGA)and CompactPCI bus. To compensate the inherent nonlinearity of the SSAs, a dynamic loop gain adjustment mechanism was implemented. Feedforward and feedback control strategy are also employed. The results of the 48-hour long-term stability test show that the amplitude stability is less than ±0.2%, significantly exceeding the design specification. This poster presents the design, implementation, and performance testing.
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