Search found 343 matches

by Mark Rowley
Thu Dec 05, 2019 5:48 am
Forum: Images du Jour
Topic: Neptunium's fusor progress
Replies: 30
Views: 8557

Re: Neptunium's fusor progress

Congrats Vince!
As always, very cool video.

Mark Rowley
by Mark Rowley
Tue Dec 03, 2019 5:20 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Steel or aluminum baseplates and other questions
Replies: 7
Views: 345

Re: Steel or aluminum baseplates and other questions

Outside of this page I've seen quite a few folks (sadly absent the necessary in-person guidance of an expert) fail at obtaining a good vacuum with the "maker" fusor arrangement. FB, Youtube, Twitter, etc are packed folks who tried. The Pyrex bell jar is almost foolproof. A Disneyland E-Ticket to a g...
by Mark Rowley
Tue Dec 03, 2019 1:12 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Steel or aluminum baseplates and other questions
Replies: 7
Views: 345

Re: Steel or aluminum baseplates and other questions

Aluminum is a decent baseplate material. Those chambers you describe are atrocious at holding a vacuum. I would abandon the idea unless you want to go through a bunch of headache and ultimately come to the same conclusion. The glass cylinders do not have a wide base like a standard bell jar. This in...
by Mark Rowley
Mon Dec 02, 2019 6:06 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Columbus-I Pinch Tube Build
Replies: 49
Views: 20856

Re: Columbus-I Pinch Tube Build

After last weeks success I quickly identified a few areas that need attention. Since the next phase of testing will be in the 30-40kv range, I’ll need to add some insulation around the central capacitor lug so flashover doesn’t go to the case. I’ve seen that happen to some quater-shrinker folks with...
by Mark Rowley
Fri Nov 29, 2019 5:04 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Bubble Detector Group Purchase (July 2019)
Replies: 4
Views: 3646

Re: Bubble Detector Group Purchase (July 2019)

This is an old post as I purchased a pair from BTI last month.

Just an FYI, the US supplier, Pulcir, no longer carries the BTI product line. Dosimeter purchases are now direct through BTI in Canada.

Mark Rowley
by Mark Rowley
Thu Nov 28, 2019 9:18 pm
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Columbus-1 Linear Pinch Fusion Success
Replies: 9
Views: 550

Re: Columbus-1 Linear Pinch Fusion Success

Thanks Richard! It’s definitely been an educational project as well as entertaining. I’ll be progressing with the smaller / high cyclic rate version after New Years.

I have to give due credit to Robert Tubbs for prompting me last February to build this device.

Mark Rowley
by Mark Rowley
Thu Nov 28, 2019 4:10 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor construction questions
Replies: 9
Views: 551

Re: Fusor construction questions

PEM cells appear to provide a comparatively dry product in relation to classic electrolysis so employing a drying segment in the system has not been necessary, at lest in my experience. Once learling how to drive my fusor, generating a bunch of neutrons has never been an issue. Additionally, I use t...
by Mark Rowley
Thu Nov 28, 2019 5:40 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Columbus-1 Linear Pinch Fusion Success
Replies: 9
Views: 550

Re: Columbus-1 Linear Pinch Fusion Success

I believe Robert Dwyer may have personal / professional experience with BTI detectors in pulse systems. He made a few comments about their solid performance with pulse work in the original Columbus-1 post. I'll call BTI on monday and see what they say and in the meantime I'll start working on activa...
by Mark Rowley
Thu Nov 28, 2019 5:34 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Columbus-1 Linear Pinch Fusion Success
Replies: 9
Views: 550

Re: Columbus-1 Linear Pinch Fusion Success

As another point to consider, all of these test shots utilized two detectors. One near the anode and another about 5" up and centrally located on the axis. As of now only the lower detector has detected neutrons which is a characteristic noted in the old research papers. If it was gamma, xray, or sp...
by Mark Rowley
Thu Nov 28, 2019 2:37 am
Forum: Other Forms of Fusion - Theory, Construction, Discussion, URLs
Topic: Columbus-1 Linear Pinch Fusion Success
Replies: 9
Views: 550

Re: Columbus-1 Linear Pinch Fusion Success

Today I had excellent results with 28.5kV / 5686 Joules /150mTorr D2. Neutron detection occurred near the anode which resulted in 11 bubbles on the BTI detector. Attached are pics of the anode and the bubble detector. Also attached is an uninterrupted video of this particular shot showing the before...