Worlds smallest Fusor.

For posts specifically relating to fusor design, construction, and operation.
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TannerOates
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Worlds smallest Fusor.

Post by TannerOates » Mon Feb 11, 2013 6:19 pm

Hello, for about 6 months now I have been working on a new fusor project. This project is aimed at being completely computer controlled (in respect to D2 flow, vacuum, voltage applied.) and of course being the worlds smallest. The main chamber of this reactor is 1 1/3" inches across, about half the size of the Chad Ramey's current 2.75" reactor. My design works off of a di-hemisphere compressible grid making it possible to have a large confinement area in relation to chamber size. This grid design allows the reactor to function on both AC and DC current, making it extremely versatile. The construction is complete stainless steel with the only viewport being made of thick lead glass. At -50kv@7.5ma there were no x-rays detected out of the chamber, which means it is safe to view in demo mode at high voltages. Due to the extremely small size of the reactor, at moderate voltages (-15kv@5ma) plasma extinguishes at around 100mbar. I will be attempting fusion this coming weekend and detecting neutrons with a victoreen 488a meter. I also will be doing a more in depth write up of the reactor at this time as well.

The first image is a DC -25kv@6ma plasma and the second is the reactor in hand. Let it be noted I will be adding a 2179a MKS flow meter to the chamber which will increase its size on the z-axis slightly.

Any technical comments and questions are always welcome.
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Tyler Christensen
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Re: Worlds smallest Fusor.

Post by Tyler Christensen » Mon Feb 11, 2013 7:47 pm

Looks nice. What instrument did you use to determine that there is no x-ray leakage at 50kv? Even 1/8" thick stainless usually starts leaking x-rays at 50kv, I find it unlikely that much thinner wall hardware used in 1.33 fittings wouldn't have pretty substantial leakage at that voltage.

Tyler

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TannerOates
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Re: Worlds smallest Fusor.

Post by TannerOates » Mon Feb 11, 2013 7:49 pm

I used a monitor-4 counter, which I have confirmed to be an adequate x-ray detector. The fittings are quite thick, the smallest being 1/4" thick blank flange.

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Richard Hull
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Re: Worlds smallest Fusor.

Post by Richard Hull » Mon Feb 11, 2013 9:01 pm

A more complete exposition of images from all angles would be nice. How did you get 50kv into that tiny thing!!??

No x-rays! I am with Tyler on that one.... If the item is in any cross or any fitting that is thin, x-rays will pour out and come on like gang busters at 50kv 7.5ma.

Just saying.... based on 15 years of playing with this stuff.

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.

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TannerOates
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Re: Worlds smallest Fusor.

Post by TannerOates » Mon Feb 11, 2013 11:34 pm

Again, I will do a more complete write up after I attempt fusion this coming weekend. Proper grounding and an adequate power source. Yes, there is a moderately thin part on the side but there is no 'line of sight' thin path to the x-ray source. I have done detection on the entire body of the reactor and found no x-rays, I will try again with another detector to double and triple check.


What is the best path to register this as worlds smallest besides for GWR(which I am waiting on).

Thanks again!

chad ramey
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Re: Worlds smallest Fusor.

Post by chad ramey » Tue Feb 12, 2013 2:41 am

Looks great! Made any neutrons from it yet?

-Chad

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TannerOates
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Re: Worlds smallest Fusor.

Post by TannerOates » Tue Feb 12, 2013 4:00 am

Thanks! Im going for fusion this weekend.

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tbogusiak
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Re: Worlds smallest Fusor.

Post by tbogusiak » Tue Feb 12, 2013 9:25 am

Dang, that's the same size chamber I'm planning on using, you beat me to it.
As for the X-rays, the 1.33" conflat cubes are made out of a solid block of stainless (I have no clue how they machine out a sphere inside it though), the THINNEST sections are about 5mm thick, you can sort of see the thick shell around the ports on my little cube. Congrats on a fine looking fusor


It'd take a bit of voltage to push a decent quantity of X-rays through those walls
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Roberto Ferrari
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Re: Worlds smallest Fusor.

Post by Roberto Ferrari » Tue Feb 12, 2013 12:28 pm

Hello
Is a beautiful setup but I am still waiting for the answer to Richard'question:
" How did you get 50kv into that tiny thing!!??"

Regards

Roberto

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TannerOates
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Re: Worlds smallest Fusor.

Post by TannerOates » Tue Feb 12, 2013 9:36 pm

I already answered it. I used an adequate power supply and safe grounding. If the pressure gets too low it will arc, but aside from that, it is very stable.

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