Archived - Fusor V Operational

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RobertTubbs
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Archived - Fusor V Operational

Post by RobertTubbs » Fri Jul 23, 2010 9:55 am

Hello all,

It's been awhile since I upgraded my rig so I've shelved my bell jars and invested in a beautiful stainless chamber. The chamber is all viton, with the two 6" ends being viton-only "knife edges." The chamber is 4.5" inside diameter and 6" long with seven wonderful ports coming out the sides for possible later additions. I've taken the liberty of slapping a butterfly and KF-40 on the butt of this thing to hook up a little air cooled diffusion pump. Another upgrade was from the non-resistive spark plug to a true blue HV feedthrough.

Check out the pictures and the link to the video of it being taken for a short test drive.

http://www.youtube.com/watch?v=FVSY8fnK0do

Enjoy,
RT
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chamber 1.JPG
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fusor valve.JPG
fusor valve.JPG (551.75 KiB) Viewed 3225 times
chamber and all.JPG
chamber and all.JPG (719.18 KiB) Viewed 3225 times
IMG_1911.JPG
IMG_1911.JPG (593.69 KiB) Viewed 3225 times
IMG_1914.JPG
IMG_1914.JPG (475.9 KiB) Viewed 3225 times

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Steven Sesselmann
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Re: Fusor V Operational

Post by Steven Sesselmann » Fri Jul 23, 2010 10:53 am

Robert,

Nice clean work, and good video too.

Is that a big neutron detector tube on the left hand side of the photo?

Steven
http://www.gammaspectacular.com - Gamma Spectrometry Systems
https://www.researchgate.net/profile/Steven_Sesselmann - Various papers and patents on RG

RobertTubbs
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Re: Fusor V Operational

Post by RobertTubbs » Fri Jul 23, 2010 10:58 am

Thanks Steven,

Yes that most certainly is, that's a 22" Reuter-Stokes Aluminum, I've got four B10's as back ups for the He3 as well!

RT

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fpg
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Re: Fusor V Operational

Post by fpg » Fri Jul 23, 2010 1:51 pm

What a beauty!!

I see you also have a Veeco leak detector diff pump. What type of flange did you use to connect the Veeco diff pump to the chamber?

Hope you get lots of neutrons .

Fredrik PG

DaveC
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Re: Fusor V Operational

Post by DaveC » Fri Jul 23, 2010 9:20 pm

Robert -

Very nice, indeed! I think you've made some good choices and obviously have the makings of a useful Fusor.

Thanks for the pics.


Dave Cooper

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Doug Coulter
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Re: Fusor V Operational

Post by Doug Coulter » Sat Jul 24, 2010 1:10 pm

Pretty indeed!

I have noted here that the closer the grid geometry matches the outer chamber shape, the more neutrons I get per watt of input -- so you might just want to try a cylinder grid aligned the same as the tank.

The way this one is set up, you could even fire in ions from a source(s) at the circumference and have that geometry very nice.

You may also get better results (or not) if you put some screen wire over the ends of some of the port entries to make the cylinder more uniform re electric field in there.
Why guess when you can know? Measure!

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Chris Bradley
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Re: Fusor V Operational

Post by Chris Bradley » Sat Jul 24, 2010 4:57 pm

Is there an explanation for why the hotter part of the grid is in the same direction as the singular electron beam? Is this usually the case for most fusors?

RobertTubbs
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Fusor V: First Neutrons

Post by RobertTubbs » Thu Jul 29, 2010 11:13 am

2:50AM
July 29, 2010
Eastside of Seattle Washington

Neutrons on Fusor V!

Power Supply: 35,000 volt 20mA mains frequency voltage multiplier with water resistor.

Vacuum system: Welch-1400 Belt driven mechanical roughing pump, Veeco air cooled diffusion pump to butterfly valve.

Neutron Detection: 22" Reuter-Stokes He3 proportional counter w/ Ludlum model 12 ratemeter.

Gas system: Platinum electrolysis with NaOH electrolyte run through drierite drying stack into Swagelock metering valve and Swagelock needle valve.

Log 1: 16,500V -- 25mA -- ~15 Microns -- 150 CPM on 22" RS He3 tube 3' from Poissor.

Log 2: 20,350V -- 22mA -- ~14 Microns -- 300 CPM on 22" RS He3 tube 3' from Poissor.

Log 3: 22,000V -- 20mA -- ~12 Microns -- 400 CPM on 22" RS He3 tube 3' from Poissor.

Log 4: 28,600V -- 18mA --~10 Microns -- 500 CPM on 22" RS He3 tube 3' from Poissor.

Log 5: 33,550V -- 5mA -- ~10 Microns -- 1000 CPM on 22" RS He3 tube 3' from Poissor.

Moderator was removed from proportional counter while operating to test for noise. These here be neutrons. I've been blessed with a relatively noise free fusor with little to no x-ray radiation beyond 1 foot. I believe it's time to stick a webcam on this bad boy and give it some more power!

Highest TIER (total isotropic emission rate) for the evening was ~50,000 neutrons/second.

Thank you and enjoy,
Robert Tubbs

http://www.youtube.com/watch?v=PtqRrVTjHCg ------ Video showing the Fusor producing neutrons.
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Richard Hull
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Re: Fusor V: First Neutrons

Post by Richard Hull » Thu Jul 29, 2010 7:53 pm

Welcome to the Neutron club Robert! I have added your name to the listing. Nice work. You will do better as you get more accustomed to operation, which is a bit of an artform in itself.

Really nice gear and a fine effort. I have archived this thread of accomplishment.

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.

Edward Miller
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Re: Fusor V: First Neutrons

Post by Edward Miller » Thu Jul 29, 2010 9:06 pm

Awesome! Congrats and thanks for posting the video it was great to watch.

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