Cavity magnetron

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Magnetron with section removed to exhibit the cavities. The cathode in the center is not visible. The waveguide emitting microwaves is at the left. The magnet producing a field parallel to the long axis of the device is not shown.

The cavity magnetron is a high-powered vacuum tube that generates microwaves using the interaction of a stream of electrons with a magnetic field. The 'resonant' cavity magnetron variant of the earlier magnetron tube was invented by John Randall and Harry Boot in 1940 at the University of Birmingham, England. The high power of pulses from the cavity magnetron made centimeter-band radar practical, with shorter wavelength radars allowing detection of smaller objects. The compact cavity magnetron tube drastically reduced the size of radar sets so that they could be installed in anti-submarine aircraft and escort ships. At present, cavity magnetrons are commonly used in microwave ovens and in various radar applications.

• See also: Wikipedia

• Related: Klystron, Traveling-wave tube, Crossed-field amplifier, Maser, Radiation Laboratory

Magnetrons Magnetrons www.radartutorial.eu/08.transmitters/tx08.en.html - Web

Magnetron collection in the Virtual Valve Museum Magnetron collection in the Virtual Valve Museum www.tubecollector.org/list.php?L=-M&M=Y&H=Magnetrons - Web

MicrowaveCam.com MicrowaveCam.com microwavecam.com/microwavecam/Videos/Grapes/index.htm - Web

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TMD Magnetrons TMD Magnetrons www.tmd.co.uk/products/microwave_tubes/index.asp - Web

(Title is somewhat cryptic) (Title is somewhat cryptic) www.thehutchisoneffect.com/.../radar-10.htm - Web

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