Fusor Forums

Who's S and S?

Is there anybody in the San Fransisco Bay / Silicon Valley area who can do TIG welding?

I pulled a welded bolt-stud partway through my baseplate and need it welded back vacuum tight.

Interesting. This makes me somewhat more optimistic -- one could substitute a heavy metal plate for the acrylic, and machine a conflat into it.

I will only put current through the filament under vacuum (e.g. 1x10^-4 Torr). Will the filament be poisoned at atmospheric pressure in air even if there is no current through it? If you're using pure tungsten filaments, they will not be poisoned by air at any time whatsoever, but they will *burn o...

As is often the case, I'm not interested in specifically building a fusor. Though my requirements for hermeticity are arguably higher. Meanwhile I have my own apprehension because the chamber types I am looking at still cost enough to not want to dive in blind (at the very least, would need to pay t...

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...

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

That is quite gigantic. Needs a big viewport door.

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 ...

Interestingly, I have never actually encountered high-high voltage silicone insulated HV wire. What I have is insulated with... some kind of rubbery polyolefin.

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.