Cavity magnetron

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Magnetron with section removed (magnet is not shown)
Complete microwave oven magnetron, with magnet and heatsink

The cavity magnetron is a high-powered vacuum tube that makes microwaves using the interaction of a stream of electrons with a magnetic field. The 'resonant' cavity magnetron type of the earlier magnetron tube was invented by John Randall and Harry Boot in 1940.[1] The high power of pulses from the cavity magnetron made centimetre-band radar practical. Shorter wavelength radars allowed the finding of smaller objects. The small cavity magnetron tube made the size of radar sets much smaller[2] so that they could be put into in aircraft[3] and ships used to find submarines.[2] At present, cavity magnetrons are commonly used in microwave ovens and in various radar applications.[4]

References[change | change source]

  1. "The Magnetron". Bournemouth University. 1995–2009. Retrieved 23 August 2009. 
  2. 2.0 2.1 Schroter, B. (Spring 2008). "How important was Tizard’s Box of Tricks?". Imperial Engineer 8: 10. Retrieved 2009-08-23. 
  3. "Who Was Alan Dower Blumlein?". Dora Media Productions. 1999–2007. Retrieved 23 August 2009. 
  4. Ma, L. "3D Computer Modeling of Magnetrons." University of London Ph.D. Thesis. December 2004. Accessed 2009-08-23.