Search found 482 matches

by Mark Rowley
Fri Sep 11, 2020 7:13 pm
Forum: FAQs: High Voltage
Topic: Empty Post / Pls Delete
Replies: 0
Views: 65

Empty Post / Pls Delete

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by Mark Rowley
Fri Sep 11, 2020 6:38 am
Forum: Images du Jour
Topic: Fusor Update - Liam David
Replies: 18
Views: 1262

Re: Fusor Update - Liam David

Impressive work Liam. I like the water cooled end caps and the new versions look like they can handle a much higher flow rate. Fwiw, I’ve found that Jon’s recommendation of using automotive super coolant makes a significant difference. Throw some ice in the coolant and it’s even better. You’ll total...
by Mark Rowley
Sun Aug 30, 2020 1:53 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 22
Views: 2543

Re: Fusor 2020 Activation Experiments

Much better results with Copper activation. 10 minutes of flux time at a rough TIER estimate of 1.7E+6 n/s. The Cu66 photopeak at 1.04MeV is very pronounced at 346 seconds. 25C73F18-3B91-4050-AA8B-97CA8D288DB8.jpeg At 1000 seconds shown with natural background in gray. 258EC9EA-3CD1-4B9E-BA48-0D97FC...
by Mark Rowley
Fri Aug 28, 2020 8:48 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 22
Views: 2543

Re: Fusor 2020 Activation Experiments

Hi Jon,
Not a bad idea. The site looks like a good overall resource too!

I’ve yet to give the copper bar a nice long exposure with the new cooling system. Tonight or tomorrow I’ll flux it with a good 15 minute run and see what turns up. Stay tuned!

Mark Rowley
by Mark Rowley
Fri Aug 28, 2020 5:24 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 22
Views: 2543

Re: Fusor 2020 Activation Experiments

Thanks Richard Knowing that I only had about 2.5 minutes with it’s half life, in short order I had to this: Turn off the fusor Turn off the fuel supply Disassemble the moderator Remove the irradiated sample RUN to the house from the backyard lab Put it in the spectrometer Stack a few lead bricks And...
by Mark Rowley
Thu Aug 27, 2020 6:33 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 22
Views: 2543

Re: Fusor 2020 Activation Experiments

Today’s run activated a small amount of aluminum powder to create the short lived isotope of Al28. This isotope has a gamma energy of 1.78MeV. The activation consisted of a 10 minute exposure to a roughly estimated neutron TIER of 1.5E+6. During this time a small sachet of aluminum powder(pictured) ...
by Mark Rowley
Wed Aug 26, 2020 8:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020
Replies: 22
Views: 2082

Re: Fusor 2020

A very good point Richard. Totally plays into why I’m having so much fun with activation lately. After a second test run this afternoon I noticed an annoying backscatter problem. Easily fixable but moderator configuration will undoubtedly get altered. If the aging BTI’s fail beforehand, I’ll be just...
by Mark Rowley
Tue Aug 25, 2020 9:42 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020
Replies: 22
Views: 2082

Re: Fusor 2020

First run with the cooling maze was a resounding success. Following a 15 minute sustained run at a roughly estimated neutron TIER of 1.3E+6 it never peaked over 87F (30.5C). Cooling fluid was water with Rislone Hy-per Cool Super Coolant. As of now, the coolant is only recirculating within a 2 gallon...
by Mark Rowley
Tue Aug 25, 2020 7:46 pm
Forum: Announcements and Site Administration Topics
Topic: A piece for the FAQ's on the Chinese HV switcher.
Replies: 2
Views: 323

Re: A piece for the FAQ's on the Chinese HV switcher.

Richard,
I’d be more than willing to put together a detailed segment regarding hookup and operation. A cut-and-paste or direct link to Rex’s precipitator hacking would be important as well.

Mark Rowley
by Mark Rowley
Mon Aug 24, 2020 7:52 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Chill to dry deuterium gas?
Replies: 5
Views: 520

Re: Chill to dry deuterium gas?

If you’re using a Horizon type PEM cell there is absolutely no immediate reason for drying the gas. Unlike classic electrolysis the PEM cell provides a comparatively dry product. I have used a cold trap to try and improve the already decent product with marginal results. Yes, a cold trap does improv...