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Generation of powerful subnanosecond microwave pulses in the range of 38-150 GHz

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12 Author(s)
Yalandin, M.I. ; Inst. of Electrophys., Ekaterinburg, Russia ; Shpak, V.G. ; Shunailov, S.A. ; Oulmaskoulov, M.R.
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Experimental measurements of coherent stimulated radiation from intense, subnanosecond electron bunches moving through aperiodic waveguide and interacting with a backward propagating TM0.1 wave are presented. The ultra-short microwave pulses in Ka, W, and G band were generated with repetition frequencies of up to 25 Hz. Observation of RF breakdown of ambient air, as well as direct measurements by hot-carrier germanium detectors, gives an estimate of the peak power up to 140 MW for the 300-400 ps pulses at 38 GHz. The initial observation of 75 GHz 10-15 MW radiation pulses with duration less than 150 ps, and of 150 GHz microwave spikes with a risetime of 75 ps are also reported

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Plasma Science, IEEE Transactions on  (Volume:28 ,  Issue: 5 )