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Description
The SIRIUS storage ring RF system currently operates with two 500 MHz superconducting cavities, each powered by a 130 kW RF plant composed of two solid-state amplifiers (SSA) and a 200 mA beam current. A passive 2-cell superconducting 3rd-harmonic cavity (3HC) is planned for installation in 2027 to increase beam lifetime through bunch lengthening and allow the beam current to be increased to the nominal value of 350 mA. This paper presents the current status of the development of a Low Level RF (LLRF) system for the 3HC based on MTCA.4 platform. The system includes a dedicated analog front-end for RF signal acquisition and conditioning, as well as clock and local oscillator (LO) generation. The digital hardware is based on Struck MTCA modules and an additional digital front-end for external signal isolation and interface with the FPGA GPIOs. Finally, the proposed DSP chain for cavity signal processing and control is presented and discussed.
| Paper status | Resubmitted proceeding files received and assigned to an editor. Accepted by Submitter. |
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