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Registered Member #1721
Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136
Hello:
This PDF was sent to me by a gentleman at the fusor.net site for help with building a microwave driven ion source. I just wanted to post it here on this forum, because the need to ionize a gas occurs so often, in so many areas of science and technology. What I like about this simple approach is, that instead of a complex RF set up with an oscillator, amplifier, and power supplies ect., all that you need here is a 50 buck new, or even a free old microwave oven. Even Better; You want the low power kind, the cheap ones.
All of the rest of the parts are simple copper plumbing, and brass or copper sheets, with some solder from your local hardware store. The only part that you need to mail order, or pilfer is a short 1/2" or 12-14mm quartz tube. I have been told that quartz is way better than Pyrex in this app., although I have not tried Vicor, or other special high temp glasses.
What can you do with this? Where do I start!!!
Build a Sulfur lamp if you want light. (Look this one up very interesting)
Build an ion source if you want particles.
Build an intense UV source with a drop of Hg, some Cd, or Xe gas.
Build a spectrum lamp if you want a certain kind of light.
Build a spectro-photometer if you want to ID stuff.
Build an ion reaction vessle if you like chemistry.
Build a microwave driven laser. (It will work up to 600 torr, so it should work for a short near atmospheric pressure TEA CO2 laser for example.) Metal vapor lasers may also be possible.
Keep in mind that microwave ovens have a pulsed output which may cause problems, the person helping me succeded in getting a low power magnetron from a small oven to run CW, at very reduced power levels (Fan Cooling is still required!). He used a HV capacitor with 1/10 of the nomal value, and ran it at a reduced voltage. If the voltage is to low the magnetron will not oscillate, if it is to high it will fry the maggie due to trapped electrons. His best results were at around 89 V input. Once he got it down it would run for hours with no problem.
There are so many applications for this technology, and now you can dabble with it for what it costs to take the family to the movies. So here is the meat, if you are interested this should get you started, and keep you busy through the winter :) Take care and remember to observe RF safety.
Registered Member #2123
Joined: Sat May 16 2009, 03:10AM
Location: Bend, Oregon
Posts: 312
There are papers describeing the deposition of polycrystalline diamond, and diamond-like carbon by flowing a mixture of hydrogen and methane gas through a glass reaction chamber inside a store-bought microwave oven.
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Universal Microwave Driven Gas Ionization Source - Many Uses Possible
