PRESENT STATUS OF DIGITAL FEEDBACK AND FEEDFORWARD PROJECT USING RED PITAYA STEMLAB

In all accelerator facilities, a Low-Level RF (LLRF) system is required to stabilize the RF field, to obtain an RF signal with flat amplitude and phase, by suppressing the presence of various disturbances in the RF system. Thus, a new Digital Feedback (DFB) system to be used in the Muon Linac for the muon g-2/EDM Experiment project at J-PARC is built and tested with a simulation test cavity. For that purpose, in our design to build an LLRF setup, the authors have chosen the Red Pitaya STEMlab board featured by high performance, small size, low cost, reconfigurable instrumentation, and open source. J-PARC resources supplied all the needed software and hardware components for the project, such as IQ-Modulator, IQ-Demodulator, and STEMlab board containing Field Programmable Gate Array (FPGA), Analog to Digital Converter (ADC), and Digital to Analog Converter (DAC). The correction of IQ-Modulator and IQ-Demodulator is conducted and the errors are successfully compensated within the control system. The preliminary results of the design and tests of the aforementioned compact DFB system are presented in this paper.