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can't make a "fusor" with a refrigerator compressor

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radhoo

Fri Jan 07 2011, 05:05PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Ash Small wrote ...

While it is possible to obtain a poisser with a two-stage vacuum pump, your pump is probably single stage. Do you know what pressure you were operating at, and what the base pressure of your system is?

No, sorry, as I said this was just a test in a hurry, and the results were as expected.

9.50 wrote ...

I've still got my old 2 stage "oil leaky" pump in the garage doing nothing which I'd offer to you free, but shipping would be prohibitve I think.

Thanks for your kind offer, but I think I will find one locally when I'm serious about completing a "fusor", hope a very tight/compact design to save space. I might need some good advise when choosing one. For eg. what about the two on top of this page:

Fabio

Fri Jan 07 2011, 11:09PM

Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148

Hi all!
I have a digital vacuometer so i can give some numbers:

My fridge compressor can pull up to 7000 microns (7mm Hg), surely NOT enough to make a poisser (even on a demo fusor)

My dual stage rotary vane vacuum pump (for A/C service) can pull up to 30 microns but only when the vacuometer is connected directly to the output; on really small chambers (few centiliters as diy vacuum tubes or discharge tubes) my best vacuum is about 45 microns after 2 hours.
if i connect a middle size chamber (one liter maltese cross tube) i can pull up to 250 microns in few hours and about 130 microns after 8 hours......... i reached 45 microns only after a week!!!!!!!!!
This pump can be enough for make a demo fusor (about 150-80 microns are required to do an inertial electrostatic confinament but the obtained particle speed it surely NOT enough for doing a real fusion).
This pump can be used to made homemade triodes and other similar devices if you add a getter inside the tube (and preferably if you fill it with pure oxygen before pumping down; oxygen acts as a flushing gas and can easily absorbed by any kind of getter, even the crappier ones selfmade using a poor quality magnesium obtained from a magnesium pencil sharpeners!)

I'm making a new powerful vacuum rig with a dual stage rotary vane pump followed by a three stage oil diffusion pump, isn't either small nor lightweight but this will able to reach enough vacuum to made a real fusion (the chamber must be pumped down to 1 micron or less, than filled with deuterium at about 10 microns before switching on the power supply)

radhoo

Sat Jan 08 2011, 11:23AM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

thanks for providing these numbers, Fabio. Can you post some pics with your pumps please?

Fabio

Sat Jan 08 2011, 11:56AM

Registered Member #122 Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148

I previously posted pics on few other thereads, you can find many informations and many photos here:

and here:

Ciao!
Fabio.

Mark-H

Tue Jan 11 2011, 11:16AM

Registered Member #607 Joined: Tue Mar 27 2007, 10:39AM
Location:
Posts: 64

Here are the only pictures I could find of my old setup at one of the Gaussfests, possibly 2005/6.
The original builders were Colin and Khalid. (may be on this forum?)

Cheers.

Mark.

radhoo

Tue Jan 11 2011, 05:45PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

Hello Mark, thanks for the pictures, you got some nice results there.

Ash Small

Tue Jan 11 2011, 10:56PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

9.50 wrote ...

Here are the only pictures I could find of my old setup at one of the Gaussfests, possibly 2005/6.
The original builders were Colin and Khalid. .

That wouldn't be Colin Heath would it?

Mark-H

Wed Jan 12 2011, 03:07PM

Registered Member #607 Joined: Tue Mar 27 2007, 10:39AM
Location:
Posts: 64

Colin "I like a new hobby" Heath. :o) Yes, the same.
And Khalid sold me his large VDG that I demo now and again as drag racing permits.
I sold the fusor and HV supply to Dave Reeve.
Unfortunately, the vaccuum pump is in serious need of tlc.
Cheers.
Mark.

Ash Small

Wed Jan 12 2011, 03:47PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

Colin had built another fusor, but gave up again before completion. I bought some pumps and other vacuum equipment from him last March. He still had a large TC but I think he was getting rid of all his HV stuff to concentrate on a hotrod.

My plans have been held up due to illness (no money coming in), so I'm currently just researching HV power supplies and ICP plasma sources. I'm hoping to complete the system later this year, with any luck.

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