Production of Multi-Gigawatt Sub-Nanosecond Microwave Pulses by the Method of Chirped-Pulse-Amplification

We demonstrate theoretically the possibility of efficient amplification and subsequent recompression of sub-nanosecond (0.25-0.3 ns) microwave superradiant pulses, which underwent preliminary stretching and became frequency-chirped. Similar technique, known as Chirped Pulse Amplification (CPA), is now successfully used in petawatt-class lasers. According to simulations, a microwave CPA scheme comprising a relativistic Cherenkov traveling-wave tube (TWT) as an active unit and dispersive elements (stretcher and compressor) based on multi-fold helically corrugated oversized waveguides can produce Ka-band sub-nanosecond pulses with peak power of about ten gigawatts.