Neutrons!

Current images of fusor efforts, components, etc. Try to continuously update from your name, a current photo using edit function. Title post with your name once only. Change image and text as needed. See first posting for details.
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sat Mar 11, 2017 5:05 pm

Here is a picture of my activation setup. (The string is attached to the sample for quick removal.)
IMG_1491.png
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sun Mar 12, 2017 3:52 am

During another successful silver activation run, the bubble dosimeter registered 25 bubbles in 210 seconds (at a distance of 12.5 cm). This correlates to 251k n/sec!
IMG_1492.png
I'm not sure what levels have been previously achieved in a small chamber (I'm using a KF50/KF40 reducing tee - 4.7cm inner diameter).
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Andrew Seltzman
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Re: Neutrons!

Post by Andrew Seltzman » Sun Mar 12, 2017 4:04 am

That's certainly the highest I've seen from such a small chamber. What was the voltage/current/pressure?
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sun Mar 12, 2017 4:16 am

Cathode Current (Ic, mA), Cathode Voltage (Vc, kV), and Pressure(mTorr) use the left scale
CPM (BF3 tube) and Cathode Power (Pc, W) use the right scale
2300_03102017.png
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sun Mar 12, 2017 4:31 am

3D CAD (plasma volume 144 cm^3)
Assem-03.pdf
(112.81 KiB) Downloaded 162 times
Mathematica Simulation

https://youtu.be/q5SWm1tc1hM
Last edited by Garrett Young on Sun Mar 12, 2017 6:10 pm, edited 1 time in total.
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Richard Hull
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Re: Neutrons!

Post by Richard Hull » Sun Mar 12, 2017 4:41 am

Your big win here is the super high D2 pressures you are recording a lot more fuel per unit volume in your system. What you lack in voltage moving you up the D-D cross section, you make up for with fusion fuel density. Wow! Just how tiny can success be in chamber size?? This is certainly one of the finest tiny chamber systems yet, with good instrumentation and data collection technique. It might be the first of its size to offer a second proof of fusion via an unquestionable 2X activation report. I just keeps gettin' better don't it?

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.

Andrew Seltzman
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Re: Neutrons!

Post by Andrew Seltzman » Sun Mar 12, 2017 4:52 am

Something looks unusual about the Pc calculation, it's not proportional to Vc*Ic and seems to be min(const*Ic,mTorr).

Nice CAD, some sort of cold cathode ion guns on the end? Looks a lot like the original Farnsworth multipactor guns.
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sun Mar 12, 2017 4:55 am

Andrew,

Pc is absolutely Ic*Vc. I think you are confusing the blue colors of mTorr and Vc.

Edit: These colors are more clear ...
2300_03102017.png
Last edited by Garrett Young on Sun Mar 12, 2017 4:58 am, edited 1 time in total.
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Re: Neutrons!

Post by Andrew Seltzman » Sun Mar 12, 2017 4:57 am

Ah, ok I see now, that's exactly what I was doing. Wow that's really high pressure. Have you thought of using an axial magnetic field?
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Garrett Young
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Re: Neutrons!

Post by Garrett Young » Sun Mar 12, 2017 5:03 am

Andrew,

Yes, I have considered an axial magnetic field and plan to try one at some point, but I think the fuel density outweighs the mean free path limitation (as Richard pointed out).

The strategy with this device is to take an ion optics approach to the fusor and that's why the center electrode and end caps are shaped as they are in the drawing.

The end caps support adding cold cathode ions guns in the future. (nice spotting)
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