17 Facts About Cavity magnetron

Cavity magnetron is a high-power vacuum tube used in early radar systems and currently in microwave ovens and linear particle accelerators.

Cavity magnetron was a radical improvement introduced by John Randall and Harry Boot at the University of Birmingham, England in 1940.

The Cavity magnetron remains in use in some radar systems, but has become much more common as a low-cost source for microwave ovens.

The Cavity magnetron was one of the few devices able to generate signals in the microwave band and it was the only one that was able to produce high power at centimeter wavelengths.

Original Cavity magnetron was very difficult to keep operating at the critical value, and even then the number of electrons in the circling state at any time was fairly low.

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Great advance in magnetron design was the resonant cavity magnetron or electron-resonance magnetron, which works on entirely different principles.

The Cavity magnetron remains in widespread use in roles which require high power, but where precise control over frequency and phase is unimportant.

The Cavity magnetron is operated with very short pulses of applied voltage, resulting in a short pulse of high-power microwave energy being radiated.

Several characteristics of the Cavity magnetron's output make radar use of the device somewhat problematic.

Cavity magnetron settled on a system consisting of a diode with a cylindrical anode surrounding a rod-shaped cathode, placed in the middle of a magnet.

Cavity magnetron released several papers and patents on the concept in 1921.

Hull's Cavity magnetron was not originally intended to generate VHF electromagnetic waves.

However, in 1924, Czech physicist August Zacek and German physicist Erich Habann independently discovered that the Cavity magnetron could generate waves of 100 megahertz to 1 gigahertz.

However, the two-pole Cavity magnetron, known as a split-anode Cavity magnetron, had relatively low efficiency.

In late 1941, the Telecommunications Research Establishment in the United Kingdom used the Cavity magnetron to develop a revolutionary airborne, ground-mapping radar codenamed H2S.

Cavity magnetron was widely used during World War II in microwave radar equipment and is often credited with giving Allied radar a considerable performance advantage over German and Japanese radars, thus directly influencing the outcome of the war.

Only if the filament is taken out of the Cavity magnetron, finely crushed, and inhaled can it pose a health hazard.