WEOO09 　高周波源・LLRF　 9月2日 講演会場１ 18:10-18:30

Present Status of Digital Feedback and Feedforward Project Using Red Pitaya STEMlab

○Ersin Cicek, Zhigao Fang, Yuji Fukui, Kenta Futatsukawa, Satoshi Mizobata (KEK), Shinichi Shinozaki, Tatsuya Hirane, Yasuhiro Fuwa (JAEA), Yuhei Iwama, Yoshikatsu Sato (NAT)

In all accelerator facilities, a Low-Level RF (LLRF) system is required to stabilize RF field, to obtain an RF signal with flat amplitude and phase, by suppressing the presence various disturbances in RF system. Currently, a simple Digital Feedback (DFB) system to be applied in the Klystron Test Stand in J-PARC Linac is under construction. For that purpose, a Red Pitaya STEMlab board of high performance, small size, low cost, reconfigurable instrumentation and open source is preferred in our design to build a high performance LLRF setup. All the needed software and hardware components to be used in this 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) are supplied by J-PARC resources. The correction of IQ-Modulator and IQ-Demodulator is completed by using a new digitizer based on micro-TCA.4. Also, this digitizer, under developed, will be used to improve the beam quality in the future LLRF system of J-PARC Linac. The preliminary results of the design and tests of the aforementioned compact DFB system are presented in this paper.