Cavity magnetron
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The cavity magnetron, or not entirely accurately reduced simply to the magnetron, is a high-
powered vacuum tube that generates microwaves using the interaction of a stream of
electrons with a magnetic field while moving past a series of open metal cavities (cavity
resonators). Electrons pass by the openings to these cavities and cause microwaves to
oscillate within, similar to the way a whistle produces a tone when excited by an air
the stream is blown past its opening. The frequency of the microwaves produced, the resonant
frequency is determined by the cavities' physical dimensions. Unlike other vacuum tubes,
such as a klystron or a travelling-wave tube (TWT), the magnetron cannot function as an
the amplifier in order to increase the intensity of an applied microwave signal; the magnetron
serves solely as an oscillator, generating a microwave signal from direct current
electricity supplied to the vacuum tube.
The use of magnetic fields as a means to control the flow of an electrical current was spurred by the introduction of the Audion by Lee de Forest in 1906. Albert Hull of General
Electric Research Laboratory began the development of magnetrons as a way to avoid de Forest's patents,[1] but these were never completely successful. Other experimenters picked up on
Hull's work and a key advance, the use of two cathodes, was introduced by Habann in Germany in 1924. Further research was limited until Okabe's 1929 Japanese paper noting the production of centimetre-wavelength signals, which led to worldwide interest. The
development of magnetrons with multiple cathodes was proposed by A. L. Samuel of Bell
Telephone Laboratories in 1934, leading to well-known designs by Postumus in 1934 and Hans Hollmann in 1935. Production was taken up by Philips, General Electric Company (GEC),
Telefunken and others, limited to perhaps 10 W output. By this time the klystron was producing more power and the magnetron was not widely used, although a 300W device was built by Aleksereff and Malearoff in USSR in 1936 (published 1940).
courtesy Wikipedia
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*** اگر آپکو میری ویڈیوز اچھی اور معلوماتی لگتی ہیں تو ، براہ کرم اپنی ویب سائٹ پر دوسرے ویب سائٹوں اور بلاگوں پر ، "تھمز اپ" کی درجہ بندی کرتے ہوئے ، اور میری ویڈیو پلے لسٹس کو دیکھنے کےساتھ ، سبسکرایبنگ ، لنکس پوسٹ کرکے اپنی حمایت دکھائیں۔ ایسا کرنے سے یہ یقینی بنانے میں مدد ملتی ہے کہ مستقبل میں مزید بہت ساری ویڈیوز جاری کی جائیں گی۔ (یہ یقینی بنانے کے لئے آراء ضروری ہیں کہ یہ چینل فعال حالت میں رہے) ***
Chapters in this video.
0:00 Introduction
2:00 Falts in magnetron
3:00 Check the Antenna cap
5:12 Broken Magnet

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