Abstract
Experimental results of the observation of superradiation from intense, subnanosecond electron bunches moving through a periodic waveguide and interacting with a backward propagating TM01 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, leads to an estimate of the peak power as high as 60-120 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 75ps are also reported. Comparison with simulations is discussed as well.
Original language | English |
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Pages (from-to) | 385-390 |
Number of pages | 6 |
Journal | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
Volume | 475 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - 21 Dec 2001 |
Keywords
- Cherenkov emission
- superradiance
- electron bunch
- electron bunches
- BWO
- millimetre wave devices
- electrical breakdown
- microwave generation