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

Yalandin, M I and Shpak, V G and Shunailov, S A and Oulmaskoulov, M R and Ginzburg, N S and Zotova, I V and Novozhilova, Y V and Sergeev, A S and Phelps, A D R and Cross, A W and Wiggins, Mark and Ronald, K (2000) Generation of powerful subnanosecond microwave pulses in the range of 38-150 GHz. IEEE Transactions on Plasma Science, 28 (5). pp. 1615-1619. ISSN 0093-3813

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Abstract

Experimental measurements of coherent stimulated radiation from intense, subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating TM01 male 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.