Author Topic: Inside a Magnetron  (Read 4463 times)

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hydro

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Inside a Magnetron
« on: January 13, 2008, 08:22:29 am »
here is a few pictures.
« Last Edit: January 13, 2008, 09:03:50 am by hydrocars »

hydro

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Re: Inside a Magnetron
« Reply #1 on: January 13, 2008, 09:40:07 am »
This is the anode and Cathode, the magnetron was gas filled. the little metal ring you see in this picture and the smaller electrode appears like it was attached or welded together. i guess it must have broke during removal.

lots of little metal pieces fell out when i disassembled it, i later found out that the pieces was actually a spring that went between the electrodes. the little circle band you see in the picture near the middle of the electrodes, the tip of the electrode and the little metal ring was separated with a spring, wich was what the little broken metal pieces was. i guess the spring bounced back and forth to get the microwaves?

the electrodes doesn't touch the inside of the copper wheel you see in the pictures, the metal rings around the inside of the copper wheel is connected very strange, it is so clean it looks like gold.

long story short, they used gas and some sort of oscillation to gain microwaves, i assume you can get the microwaves with the electrodes without the housing you see, but with the housing and the way the rings is attacted to the housing wheel you get radiation some way threw the gas.

this is the best i can do at describing it. 



(http://ionizationx.com/index.php?action=dlattach;topic=148.0;attach=373;image)


EDIT, i guess this is a resonate cavity filled with gas. thats why the rings are connected so strange.

(http://ionizationx.com/index.php?action=dlattach;topic=148.0;attach=369;image)
« Last Edit: January 13, 2008, 09:45:51 am by hydrocars »

hydro

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Re: Inside a Magnetron
« Reply #2 on: January 13, 2008, 09:53:55 am »
Yes, i was totally right, i looked at the metal ring in the center of the electrodes and it is made to where when the spring bounces it has a fine slop in it to recenter the spring each time it comes back to the electrode to make the connection, so the microwave is determined by the bounce of the spring, the outside housing and odd looking arm just amplifies it into electrons to throw it out the tip of the magnetron.

this is somewhat confusing.

http://hyperphysics.phy-astr.gsu.edu/hbase/waves/magnetron.html
« Last Edit: January 13, 2008, 10:40:34 am by hydrocars »

KWS

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Re: Inside a Magnetron
« Reply #3 on: January 31, 2008, 03:34:26 am »
nice wrok on that hydrocarz......


I think you found the copper cup thing in the 923 pulse method.. interesting.....
was wandering how a laminated transformer works to ..hmmm  well    its a microwave oven.... how comes it gets to use a laminated transformer?

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Re: Inside a Magnetron
« Reply #4 on: July 08, 2012, 20:01:24 pm »
I think is the electron wind that oscillates the tank circuit formed by those small cavities (resonant cavity) when its force to pass thru them by the high tension applied,  that generates the microwaves. The MOT is only a mean to generate the high voltage that accelerate the electrons emitted from a filament. It has a loose coupling so to limit the current under short circuit condition, and it don't oscillate at microwave frequencies. The filament has a low voltage applied to it thru two chokes that serves as a high impedance for the microwave signals while let the low frequency or dc to pass undisturbed.

I guess there is a threshold where microwaves are emitted just like a flute. If you push it harder it should go to a second harmonic...