Joe Gayo's Fusor - Neutron Detection Upgrade

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.
Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Wed Jan 23, 2019 5:22 pm

IMG_1071_sm.jpg
23Jan19-8am-Run.png

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Dennis P Brown
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Dennis P Brown » Wed Jan 23, 2019 7:39 pm

Outstanding data processing and presentation. Perfect example of a top level experiment.

If you had done the IEEE paper, it would have been done correctly with carefully measured results.

Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Sun Jan 27, 2019 9:46 pm

Hovering right around the 1 Mega n/sec mark ... 950k to 1050k per second ... once I upgrade my feed through and push well past 50kV the barrier should be definitively broken

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Richard Hull
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Richard Hull » Wed Jan 30, 2019 2:10 am

Silver will activate easily for you at you current level.

Richard Hull
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Fusion is the energy of the future....and it always will be
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Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Wed Jan 30, 2019 6:14 am

Correct, Silver is easy for my setup. I’m finishing my gamma spectrometer to work with Indium.

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Dennis P Brown
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Dennis P Brown » Wed Jan 30, 2019 10:31 am

Amazing setup and really great posts! Your efforts have been really impressive.

One thing you might consider adding is paraffin shielding (and possibly a boron compound added to its outer surface) since you are getting well over (another post) a million neutrons/sec. For longer term operation, this would reduce exposure - while your fusor does not produce a lot of radiation the neutrons are deeply penetrating and have a high impact on tissue compared to most other types of radiation (esp. due to these particles being fast neutrons.) Neutrons are, unlike other forms of radiation, rather long lived (they have a 10 min. half life) and do tend to "hang around" when they are thermalized.

Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Sat Feb 16, 2019 10:59 pm

Added an axial magnetic field (~250 Gauss) to stabilize the discharge and push the power higher.

Pressure: 28mTorr-31mTorr (because the chamber volume is very small and running dozens of 1200W runs the background pressure is effected significantly by the chamber temperature which exceeded 100degC)
Voltage: 52-40kV (drop is based on increasing pressure)
Current: 24mA
TIER: 1,525,000 n/sec
1.5Mnsec-1200W-16Feb2019.png
I repeated this run approximately 30 times with results in the +/- 10% range.

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Rich Feldman
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Rich Feldman » Sun Feb 17, 2019 3:18 am

Nice. Please say more about how you set up the axial magnetic field -- or point to an earlier post if you already told the story. Permanent magnets? Steel yoke?
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Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Sun Feb 17, 2019 4:33 am

Qty. 2 of 5856K16 (from McMaster Carr) on one opposing pair of sides. The fields are aligned in the same direction. I used FEMM (http://www.femm.info/wiki/HomePage) to calculate the field strength.

Joe Gayo
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Re: Joe Gayo's Fusor - Neutron Detection Upgrade

Post by Joe Gayo » Sun Feb 17, 2019 4:58 am

For the first few seconds, the count rate is 400/sec when the voltage is 50kV. As the pressure rises and the voltage falls, the count rate finishes at 200/sec. Roughly 100/sec correlates to 500k n/sec, so the rate starts at 2M n/sec and falls to 1M n/sec. If the pressure was dynamically controlled to compensate for the temperature rise, then 2M n/sec would be sustainable.

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