Phase locking of two long-pulse, high-power magnetrons

Author

Treado, Todd A. ; Brown, Paul D. ; Hansen, Todd A. ; Aiguier, Darrel J.

Author_Institution

Varian Associates, Beverly, MA, USA

Volume

22

Issue

5

fYear

1994

fDate

10/1/1994 12:00:00 AM

Firstpage

616

Lastpage

625

Abstract

We have phase locked a pair of long-pulse, high-power, secondary-emission magnetrons to an RF-isolated low-power driver via a waveguide directional coupler. With the 3 dB hybrid coupler, the peak and average power sent back towards the driver were lower than the total power by factors of 20 and 100, respectively. A dual-channel, thyratron-switched line-type modulator was used to power the magnetrons in parallel. In this experiment the total microwave power from the pair of phase-locked high-power magnetrons was limited to 48 MW for 700 ns pulses and 46 MW for 900 ns pulses because one of the high-power magnetrons would only operate at or below half power. Experimental results from this repetitively-pulsed (10 Hz) phase-locked magnetron pair are presented which show excellent phase stability of several degrees both during the pulse and from pulse-to-pulse

Keywords

directional couplers; magnetrons; modulators; phase locked loops; stability; 3 dB hybrid coupler; 46 to 48 MW; 700 to 900 ns; RF-isolated low-power driver; high-power magnetrons; long-pulse magnetrons; phase locking; phase stability; secondary-emission magnetrons; thyratron-switched line-type modulator; waveguide directional coupler; Directional couplers; Frequency; Magnetic modulators; Magnetrons; Microwave antenna arrays; Microwave devices; Microwave oscillators; Phased arrays; Pulse amplifiers; Space vector pulse width modulation;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.338275

Filename

338275