Search found 454 matches

by ian_krase
Fri Dec 13, 2019 7:27 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Efficient way to bombard target with electrons in the 50-100 eV range? (not for fusor)
Replies: 20
Views: 2125

Re: Efficient way to bombard target with electrons in the 50-100 eV range? (not for fusor)

Ion beam sputtering? Sounds interesting -- and like something to try if I ever get a bigger chamber. If I was doing this, I would put the filament at ground potential and drive the target positive, assuming I have three feedthroughs. Makes the filament heater supply easier. I don't use SEM filaments...
by ian_krase
Fri Dec 13, 2019 7:24 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor V Chamber
Replies: 20
Views: 6737

Re: Fusor V Chamber

Outgassing -- because it's huge and has lots of internal surface area?

That is quite gigantic. Needs a big viewport door.
by ian_krase
Thu Dec 12, 2019 5:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Making Large Vacuum Chambers
Replies: 10
Views: 1499

Making Large Vacuum Chambers

Pipe tee fusors are all the rage nowadays, which is good because they are inexpensive to make without welding. But sometimes, we want much larger chambers. Which typically are at least hundreds of dollars even used on Ebay. Does anybody here have experience using pressure cookers, pressure pots, or ...
by ian_krase
Thu Dec 12, 2019 5:08 am
Forum: Items wanted
Topic: 60 kV Cable, any gauge
Replies: 11
Views: 1078

Re: 60 kV Cable, any gauge

Interestingly, I have never actually encountered high-high voltage silicone insulated HV wire. What I have is insulated with... some kind of rubbery polyolefin.
by ian_krase
Wed Dec 11, 2019 6:03 am
Forum: Items wanted
Topic: 60 kV Cable, any gauge
Replies: 11
Views: 1078

Re: 60 kV Cable, any gauge

Personally I would only use RG-213 with extreme high voltage, and never any cable with a foamed interior.

Also it is worth noting that for extreme high voltage, Spellman actually uses a high-voltage-rated version of RG-213.
by ian_krase
Sat Dec 07, 2019 2:55 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2102

Re: 30keV Deuteron Source

I meant the ceramic disk holding the middle element of the einzellense.
by ian_krase
Fri Dec 06, 2019 5:28 am
Forum: Ion Gun Design and Construction (& FAQs)
Topic: 30keV Deuteron Source
Replies: 9
Views: 2102

Re: 30keV Deuteron Source

I'm a bit unclear on how this very impressive system all goes together.

What's the white ceramic material?
by ian_krase
Thu Dec 05, 2019 5:52 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Steel or aluminum baseplates and other questions
Replies: 7
Views: 1056

Re: Steel or aluminum baseplates and other questions

I have a Pyrex cylinder chamber that I use for my sputter coater.

I achieve 1 micron pretty easily, and I think if I could just find my leak I would get to one millitorr. Grease and grinding is necessary to achieve this.
by ian_krase
Sun Nov 24, 2019 12:01 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Demo Fusor Progress
Replies: 10
Views: 1693

Re: Demo Fusor Progress

Apropos of being careful with oil burner transformers: I use an oil burner transformer for my system, and today I ran a long (hours) attempt at sputter deposition of aluminum. (I am still trying to ignore logic and common sense and do it without argon). My deposition was put to an abrupt stop when I...
by ian_krase
Sun Nov 24, 2019 11:52 am
Forum: Images du Jour
Topic: putt-putt boat fusion
Replies: 13
Views: 4816

Re: putt-putt boat fusion

As a boy, I once made a "putt-putt boat" from scratch out of wood and 1/8 inch copper tubing. In practice it was more like a "gurgle-gurgle boat", and very slow moving -- I think it was vastly oversized for the "engine" and the boiler was also oversized for the heat source -- at the very least, a mu...