My Manhattan Project...

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Sven Andersson
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My Manhattan Project...

Post by Sven Andersson » Tue Sep 06, 2016 2:56 pm

During the Manhattan Project the scientists and engineers pursued many leads at the same time; they simply didn't have the time to do any proper R&D and wait for results.

If I had access to a physics lab and colleagues to juggle ideas with and a proper physics education, I could test my ideas easily. Now I have to do many things at the same time and do whatever I can with the equipment I can buy on eBay.

One lead I want to pursue is the method of ionization described in the picture text. How can this be done? Solenoid bought on eBay and a high frequency voltage generator? What is a high frequency voltage generator? From the book Gas Discharge Physics by Yuri P. Raizer:
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ScreenHunter_361 Sep. 06 16.30.jpg

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Richard Hull
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Re: My Manhattan Project...

Post by Richard Hull » Tue Sep 06, 2016 7:49 pm

Carl Willis did this a few years back here and included images of his work. RF coupled energy into gases is very old news. small neon lamps in a microwave oven is a common show of this effect.
Note** The use of microwave ovens in any experiment can be dangerous. A good amateur radio transmitter can be brought to service with a loading coil tuned to excite gases in vacuuo.

Richard Hull
Progress may have been a good thing once, but it just went on too long. - Yogi Berra
Fusion is the energy of the future....and it always will be
Retired now...Doing only what I want and not what I should...every day is a saturday.

Jerry Biehler
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Re: My Manhattan Project...

Post by Jerry Biehler » Tue Sep 06, 2016 9:03 pm

Use are rf generator either in 13.56mhz or 450khz, these are ISM bands and you wont need a license to run on them. You will still need a matching network and understanding on how to create the right coil for the load. One of my ion sources for my vacuum system uses inductively coupled plasma.

Jeroen Vriesman
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Re: My Manhattan Project...

Post by Jeroen Vriesman » Wed Sep 07, 2016 9:21 am

picture of our home-build plasma cleaning, bell jar with coil, 13.56MHz 350W
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plasma_cleaning.jpg

Sven Andersson
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Re: My Manhattan Project...

Post by Sven Andersson » Thu Sep 08, 2016 2:29 pm

Jerry Biehler wrote:You will still need a matching network and understanding on how to create the right coil for the load.
Where can I read up on this subject? Book or online resource?

Sven Andersson
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Re: My Manhattan Project...

Post by Sven Andersson » Thu Sep 08, 2016 2:31 pm

Jeroen Vriesman wrote:picture of our home-build plasma cleaning, bell jar with coil, 13.56MHz 350W
Very interesting! Where did you get the radio transmitter? Do you have any tips on where to learn more on this?

Jeroen Vriesman
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Re: My Manhattan Project...

Post by Jeroen Vriesman » Sun Sep 11, 2016 4:36 pm

Sven,

we got our 350W RF power supply from a vacuum equipment surplus seller.
With the matching network. So we took the easy road :) did cost some money.

The goal of a matching network is to transform the impedance of the load (the plasma) to about 50 ohm load on the coax cable.
That is simple with a fixed load, but a plasma show variations with pressure and other conditions, so sometimes a servo-driven variable capacitor is used, with some control electronics. Not easy.

Anyway, look at T or PI networks to get an idea of impedance matching, you need basic circuit theory (complex number in the frequency domain) to calculate the currents, voltages and impedances.

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