Title :
Highly Effective, Repetitive Nanosecond-Range Ka-band BWO
Author :
Yalandin, M.I. ; Rukin, S.N. ; Shpak, V.G. ; Shunailov, S.A. ; Rostov, V.V. ; Mesyats, G.A.
Author_Institution :
Inst. of Electrophys. UB RAS, Ekaterinburg
Abstract :
The quasi-stationary mode of operation of a high-efficiency 38-GHz nanosecond relativistic microwave backward-wave oscillator at a pulse repetition rate of 10 Hz has been demonstrated. A hybrid modulator based on an SM-3N SOS driver and on an energy compression unit containing a pulse-forming line and a spark gap was used to produce 5-ns electron-beam-accelerating pulses of the trapezoidal shape. Optimization of the energy exchange between the weakly magnetized electron flow and the oncoming harmonics of the TM01 wave inside the periodic slow-wave structure has made it possible to achieve a peak power of ~170 MW for 4-ns microwave pulses at an electron efficiency no less than 30-35%.
Keywords :
accelerator RF systems; cyclotrons; electron beam focusing; microwave diodes; microwave oscillators; microwave tubes; particle accelerator accessories; SM-3N SOS driver; electron beam accelerating pulse; energy compression unit; energy exchange optimization; frequency 38 GHz; nanosecond-range Ka-band BWO; oncoming harmonics; periodic slow-wave structure; pulse-forming line; quasi-stationary operation mode; relativistic microwave backward-wave oscillator; spark gap; trapezoidal shape; weakly magnetized electron flow; Electron traps; Energy exchange; Microwave oscillators; Periodic structures; Power system harmonics; Pulse compression methods; Pulse modulation; Pulse shaping methods; Shape; Sparks;
Conference_Titel :
IEEE International Power Modulators and High Voltage Conference, Proceedings of the 2008
Conference_Location :
Las Vegas, NE
Print_ISBN :
978-1-4244-1534-2
Electronic_ISBN :
978-1-4244-1535-9
DOI :
10.1109/IPMC.2008.4743674
