High-power, high efficiency, injection-locked, secondary-emission magnetron

Author

Treado, Todd A. ; Bolton, Richard A. ; Hansen, Todd A. ; Brown, Paul D. ; Barry, Jonathan D.

Author_Institution

Varian Associates, Beverly, MA, USA

Volume

20

Issue

3

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

351

Lastpage

359

Abstract

A 60-MW, 60% efficient, 35 J/pulse secondary-emission magnetron at S-band is described and experimental results from this moderate voltage (<120 kV), repetitively pulsed (10 Hz), injection locked (14-15 dB gain) device are reported. Efforts to minimize high-voltage and RF breakdown at high power are described. Results from particle-in-cell code computer simulations compare very well with the experiment when space-charge-limited emission is assumed. Several factors which can limit the power and pulse length from this magnetron, including RF and high-voltage breakdown, cathode emission, and transport heating, are discussed. By increasing the voltage, the drive power, and the magnetron length and by using a tungsten alloy anode, 120 MW should be achievable for approximately 4-μs pulses at 130 kV, with the pulse length limited by transient heating of the anode

Keywords

electric breakdown; magnetrons; secondary emission; 10 Hz; 120 MW; 120 kV; 130 kV; 14 to 15 dB; 4 mus; 60 MW; 60 percent; RF breakdown; S-band; W alloy anode; cathode emission; computer simulations; high efficiency; high-voltage breakdown; injection-locked; particle-in-cell code; pulse length; secondary-emission magnetron; space-charge-limited emission; transport heating; Anodes; Cathodes; Computer simulation; Electric breakdown; Gain; Heating; Magnetic devices; Radio frequency; Tungsten; Voltage;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.142836

Filename

142836