Chunjie Xie, Leilei Tang, Yu Liang, Guangyao Feng, Lin Wang, Zeran Zhou. Predistortion model of klystron based on Field Programmable Gate Array (FPGA)[J]. High Power Laser and Particle Beams, 2022, 34(3): 031022
- High Power Laser and Particle Beams
- Vol. 34, Issue 3, 031022 (2022)
Fig. 1. Layout of the linear accelerator of Hefei Infrared Free Electron Laser (IR-FEL)
Fig. 2. Input-to-output characteristic of the amplitude of the klystron
Fig. 3. Principle of predistortion algorithm
Fig. 4. Simplified schematic of the LLRF controller board
Fig. 5. Schematic of the lookup-table-based klystron predistortion
Fig. 6. Simulation of error between actual input and output curves of klystron and 2048-node direct lookup-table algorithm and 32-node lookup-table with linear interpolation algorithm
Fig. 7. Input to output amplitude curve of klystron (216 kV) before and after predistortion
Fig. 8. Comparison of feedback efficiency with linearization and without linearization
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Table 1. Results of FPGA implementation
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