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High-gradient radio-frequency (RF) pulses are fundamental to the operation of linear accelerators. In a typical linac, such pulses are generated by a klystron or magnetron. To obtain higher peak power, RF pulse compressors are widely employed. A relatively long, low-power pulse with a specifically tailored amplitude and phase profile can be transformed by the compressor into a short pulse with several times the original power, thereby increasing energy efficiency and reducing the cost of the microwave source. In the present work, two compressors are cascaded to achieve two-stage pulse amplification. To this end, the low-level radio-frequency (LLRF) system generates a multiple-phase-reversal waveform that can be edited in real time. In our implementation, a 1.5-μs pulse is compressed to 50 ns by employing ten phase reversals. Iterative learning control (ILC) is applied to modulate the waveform and compensate for imperfections in the electronics. The resulting LLRF output is fed into a simulated model of the two-stage compressor, and the results show that this method can achieve a power amplification factor of 15.
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