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Registered Member #61612
Joined: Mon May 15 2017, 01:20PM
Location:
Posts: 3
Hello world!
This is my first thread here, hope you'll take it easy if my English isn't good enough.
We started to make our vacuum/gas mix system about a couple of years ago. We planned to work with pure gases so the good vacuum is required. First we use one diffusion pump but it worked rather slow, plus we weren't able to solve a problems with oil vapours in a system. So a year ago we got a Leybold Turbovac in working condition and now we have a vacuum about 5*10-7 torr without glass and ~2*10-6 with glass bulb connected.
In current setup we can mix up to six gases with ~0.2 torr pressure tolerance. We use 2 baratrons to measure the absolute pressure level in mix.
Last year we worked for experience in a simple 1-2-3 components gas mixtures, and finally last week we started rather sophisticated experiments with 5-component mix (mostly neon). We thought about some crap on the output but the results are quite good. Hope you'd like it too)
Some of our earlier experiments also posted there on youtube.
We have more than 20 different gases to work with so I hope we'll make more beautiful stuff soon)
Registered Member #133
Joined: Fri Feb 10 2006, 10:27PM
Location: Pensacola, Florida
Posts: 47
Thank you for sharing the videos.
For your "K2 multi-gas neon mix..." video, the display is changing with time. Did you dynamically change the pressure during operation, or are you changing the power source amplitude and/or frequency?
Registered Member #61612
Joined: Mon May 15 2017, 01:20PM
Location:
Posts: 3
The tube is complete. There we use our simple modulator with programmable change of frequency and impulse width. We found that discharge in SOME gas mixtures is sensitive to almost any parameter of power supply voltage shape. You can try this with cheap chineese plasma-balls. Other gas mixtures has "slow" response for such modulation changes.
Now we are working on more comprehensive modulator schematic, which can open more discharge types with the same plasma tubes.
Here is one of our first experiments with that modulator:
Registered Member #59110
Joined: Mon Apr 11 2016, 04:35PM
Location: Camarillo, California
Posts: 74
Very good work. Your tubes look to be about 9cm by 120cm long.
It looks like you are winding your own transformers> I'd be interested in that. I had much trouble with power supplies until I got a small stock of old color TV flybacks that will easily do 25kV Pk-pk.
Here is a small video showing three of my tubes.
An interesting plasma mixture I have recently tried gives golden yellow tendrils with neon red feathery tips. I use ~300 torr neon and 1 torr each Nitrogen and krypton. No tube baking is required.
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Just started really intresting experiments on plasma in mixed gases
