magnetron

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mag·ne·tron

(mag'nĕ-tron)
Device within a linear accelerator that serves as a microwave amplifier and oscillator.
See also: klystron
[magnet + -tron fr. electron]
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Still, Japan developed its own microwave cavity magnetron, which was incorporated into a large number of shipboard radars.
Well, during World War II, Birmingham University Professors, John Randall and Harry Boot, created a gizmo called the cavity magnetron.
But the greatest prize of all was the cavity magnetron - Britain's most closely guarded secret.