Magnetron section transverse to axis



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English: Magnetron section transverse to axis.

Section through a magnetron from a microwave oven. The magnetron has a diameter of about 4 centimetres.

There is a central cathode which is grey in colour. Everything else is copper and forms the anode.

Around the anode, a total of 10 'spokes' are connected to the exterior of the magnetron. There are 5 'plain' spokes that are alternated with 5 'notched' spokes (the notches can be seen near the outer ring). Each pair of adjacent spokes (i.e. a plain spoke and a notched spoke) forms a resonant cavity.

Around the cathode, two concentric rings (an inner ring and an outer ring) can be seen. The inner ring electrically connects the notched spokes; the outer ring electrically connects the plain spokes. The inner and outer rings are known as 'strapping' rings and ensures that the magnetron operates in the 'pi' mode.

For the notched spoke that is roughly at the 'ten o'clock' position, the notch has an output coupling loop that extends upwards and out of the top of the photo. The output coupling loop is used to couple microwave energy out of the magnetron so that the microwave energy can heat up food in the microwave oven.

Incidentally, note that the magnetron shown in this photo is almost exactly the same as the magnetron shown in another photo on the magnetron page:
Date 11 March 2009(2009-03-11)
Source Own work
Author Pingu Is Sumerian


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EXIF data:
File name magnetron_section_transverse_to_axis.jpg
Size, Mbytes 2.6950107421875
Mime type image/jpeg
Camera manufacturer Canon
Camera model Canon EOS 400D DIGITAL
Orientation of image 1
Image resolution in width direction 72
Image resolution in height direction 72
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Exposure time 6/10 sec (0.6)
F number f / 16
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ISO speed rating 100
Exif version 0221
Lens focal length 70 mm
Date and time original image was generated 2009:03:11 17:42:10
Date and time image was made digital data 2009:03:11 17:42:10
Meaning of each component 
Shutter speed 0.73696899414062
Aperture 8
Exposure bias 0
Metering mode 5

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