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by Dennis P Brown
Wed Dec 01, 2021 11:38 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: New Fusor: progress
Replies: 4
Views: 220

Re: New Fusor: progress

After a few hours of baking out a number of sections of the chamber and connectors, the current pressure is about 30 microns (rather high for my two stage pump.) Running the turbo, this drops below 1 micron and the ion gauge says 0.2 microns before cutting out. Certainly a significant improvement bu...
by Dennis P Brown
Wed Dec 01, 2021 7:42 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: New Fusor: progress
Replies: 4
Views: 220

Re: New Fusor: progress

Started the "bake out" of the fusor system; I did the main 'cross' and now doing an end cap - one is already done (top) and doing the left. The right, bottom, and main connector tree below that also need to be done. Having only 12 feet of heating tape for this chamber makes the going slow. Again, on...
by Dennis P Brown
Wed Dec 01, 2021 11:24 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Another HV Feedthrough
Replies: 9
Views: 2590

Re: Another HV Feedthrough

I've had success with steel welding rods as an electrode; no melting issues and only minor sputter coating issues - but that is an issue to be aware of.

These are rather easy to bend into shape (resist work hardening), and cut.

Your electrode is looking good.
by Dennis P Brown
Wed Dec 01, 2021 11:20 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: gs-usb-pro neutron counter?
Replies: 3
Views: 119

Re: gs-usb-pro neutron counter?

Certainly call the company and ask to talk to an engineer - explain you have a technical question. It is likely the Engineer can answer your question - be sure to know the make and model of the detector, that you are measuring low flux neutrons using a He-3 detector. They will likely know what does ...
by Dennis P Brown
Wed Dec 01, 2021 11:01 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: New Fusor: progress
Replies: 4
Views: 220

Re: New Fusor: progress

Well, quick test yesterday and out gassing for the system is severe and likely, a minor leak around the new electrode. My large two stage pump can only get the system down to 80 or 90 microns; the turbo just 5 microns. So a clean up, rework the electrode seal, bake out and hopefully, the system can ...
by Dennis P Brown
Tue Nov 30, 2021 8:19 pm
Forum: Please Introduce Yourself
Topic: Saying Hi from Pennsylvania!
Replies: 3
Views: 268

Re: Saying Hi from Pennsylvania!

Hello, and I too liked taking stuff apart and building new stuff back as a teen - I would get old refrigerators (salvaged from junk yards), get the compressors and build ultra-cold refrigeration systems (-40 C); and I converted a few into vacuum pumps for a laser (Co2) while in High School. I even b...
by Dennis P Brown
Tue Nov 30, 2021 12:06 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 26
Views: 548

Re: Is this neutron counter dead?

Thanks for the post on the detector parameters.

Just remember, X-rays don't love you! Proper shielding and detectors to determine exposure is critical for one's long term health - safety matters.
by Dennis P Brown
Tue Nov 30, 2021 11:51 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: New Fusor: progress
Replies: 4
Views: 220

Re: New Fusor: progress

An update on the new fusor; just completed machine work on the surplus flange for the electrode assembly so it can mate with the fusor chamber. Getting surplus flanges saves a great deal of money but often means one needs to add bolt holes, threaded holes and/or new O-rings slots. Being able to mach...
by Dennis P Brown
Sun Nov 28, 2021 8:00 pm
Forum: Please Introduce Yourself
Topic: Hello from Florida!!
Replies: 1
Views: 119

Re: Hello from Florida!!

Hello and welcome. Buying surplus vacuum & electronics components online from ebay (and finding the companies that specialize in it) is critical for affordable equipment; I routinely got high end two stage vacuum pumps for $10 and a turbo & controller for the same price (using it now.) Inexpensive h...
by Dennis P Brown
Sun Nov 28, 2021 7:48 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor from India.
Replies: 2
Views: 147

Re: Fusor from India.

That dental x-ray transformer (x-former) has a huge power output (6000 watts) and, of course, when operational will pose an extreme danger of x-rays from the fusor (proper shielding will be critically important). Cabling, ballasting, and a power supply controller for the x-former will be a challenge...

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