What vacuum chamber do I use?

Jonathan Davis · Post by **Jonathan Davis** » Wed Sep 26, 2018 1:00 am

Many people recommend using two steel hemispheres joined together such as this:

But other people who've built fusors suggest an acrylic tube.
I am unable to find sufficient documentation to work out what to purchase.
If anyone knows please help!

Post by **Richard Hull** » Wed Sep 26, 2018 2:28 am

No plastics ever! Period. No glass ever.....If you want to do fusion.

Richard Hull

Jonathan Davis · Post by **Jonathan Davis** » Wed Sep 26, 2018 9:01 am

Cool. I can do that... probably.
I've attached a couple of scans detailing the design of a fusor. My design will probably differ due to parts availability, but this is the theory..

I'll keep you up to date with my progress anyway....
Sorry the quality is 0, I took it with an app on my phone

BTW I will be documenting everything on my channel here: www.youtube.com/nitrojonscience/

Thx
Jonathan
So glad I discovered this place!

ian_krase · Post by **ian_krase** » Thu Sep 27, 2018 5:43 am

An alternative to the hemispheres is a smaller (2 to 4 inches) "pipe tee" fusor.

Jonathan Davis · Post by **Jonathan Davis** » Thu Sep 27, 2018 6:56 am

Do you have any pictures, and are there any extra benefits to using 'pipe-tee' systems? (Cost, safety, efficiency)
Thanks!
Jonathan

Jonathan Davis · Post by **Jonathan Davis** » Thu Sep 27, 2018 7:06 am

Oh, and are aluminium chambers an option (I don't know how to weld and am not looking forwards to dealing with industrial stainless steel!)
-Jonathan

Dennis P Brown · Post by **Dennis P Brown** » Thu Sep 27, 2018 9:19 am

The major advantage with a four way cross is that for a given voltage (as little as 25 kV and around 20 ma) one can obtain an easy to detect neutron signal. These small "chambers" work at significantly higher pressure, and are very easy to assemble. Having the four "ports" allows all essential connections to be installed (view port, vacuum pump down, gas inlet and high voltage connection.) As for cost, finding these on ebay as good deals isn't to difficult and compared to a custom chamber, about as inexpensive a route as possible. The ID for the cross was a std 2.75" if memory serves.

There have been at least two people entering the fusor neutron club who used this methodology.

Do search these results (occurred in the last two years) and read their approaches and results.

Jonathan Davis · Post by **Jonathan Davis** » Thu Sep 27, 2018 10:13 am

So no welding?

Dennis P Brown · Post by **Dennis P Brown** » Thu Sep 27, 2018 10:33 am

For a four-way cross, really no need for welding. Drilling, maybe. But simple KF fittings for the covers and using covers that have pre-made window/connectors make the job rather easy. The issue is finding the right pieces at the right price on ebay - patience is the key.

Jonathan Davis · Post by **Jonathan Davis** » Thu Sep 27, 2018 10:51 am

Do you know a place where I can get a cross? I have a potential 2000 dollar AUD budget but I think most of it will be used on the pumps or the deuterium. Do you have any pictures?

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