Search found 193 matches

by MarkS
Sat Sep 27, 2008 3:40 pm
Forum: Vacuum Technology (& FAQs)
Topic: Need help with interpreting vacuum measurements... ideal vacuum levels for fusion
Replies: 3
Views: 2003

Re: Need help with interpreting vacuum measurements... ideal vacuum levels for fusion

These questions are covered by many entry level chemistry books, and all over the internet. Take some time do some research, and, if you can, do research at a university library.
by MarkS
Sat Sep 27, 2008 3:32 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Could this be used for a fusor?
Replies: 3
Views: 1766

Re: Could this be used for a fusor?

<t>I think that buying a new vacuum chamber like that is a waste of money, especially if you do not have any time constraints. $7k is more then enough to do two whole fusor projects. Likewise if time is of no object to you then waiting for a chamber which would suit your needs on ebay or some other ...
by MarkS
Thu Sep 25, 2008 12:43 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Two fast neutrals in a fusor - (just some light relief)
Replies: 5
Views: 1929

Re: Two fast neutrals in a fusor - (just some light relief)

Heisenberg is out for a drive when he's stopped by a traffic cop. The cop says, "Do you know how fast you were going?"
Heisenberg says, "No, but I know where I am."
by MarkS
Wed Sep 17, 2008 2:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Last stages with pressure managements and traps
Replies: 3
Views: 1658

Re: Last stages with pressure managements and traps

<r>Pressure readouts are very low, I only have an analogue t/c guage, and it's routinely zero'd out. Since it's only a "demo" model, no D2 yet, pressure is managed by either very small leaks, or outgassing (I'm not really sure), and adjusting the angle valve. I don't recall the brand of my diffusion...
by MarkS
Wed Sep 17, 2008 2:02 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Last stages with pressure managements and traps
Replies: 3
Views: 1658

Re: Last stages with pressure managements and traps

<t>You don't need a cold trap. I run my demo with a diffusion pump backed my a welch 1402, and only an angle valve between the diffusion pump and the chamber. I haven't had too much back streaming oil because my foreline is about 3 or 4 feet long. You could run your setup without a cold trap and see...
by MarkS
Tue Sep 16, 2008 4:40 pm
Forum: Ion Gun Design and Construction (& FAQs)
Topic: Starfire Ion Gun Test
Replies: 13
Views: 7247

Re: Starfire Ion Gun Test

Curtis,
I believe that the setup you're referring to is underway by Andrew Seltzman. He posted data on a cooled grid sometime ago. His website has pictures of planned ion guns, and Andrew has consistently done what he's planned. Search him, and stay tuned!
-Mark Siegel
by MarkS
Wed Sep 10, 2008 12:33 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Power Supply Identification/Manufacturer Number Translation
Replies: 7
Views: 2807

Re: Power Supply Identification/Manufacturer Number Translation

<t>I'd have to agree with Brian, the Spellman looks like a 20kV, 20mA Positive supply. The Glassman appears to be 75kV, 1mA Positive. My Glassman is a 30kV, 10mA and the multiplier is air-insulated stack, stuck inside an insulating plastic box, and the whole thing comes apart if you pull the right s...
by MarkS
Wed Aug 27, 2008 12:52 am
Forum: Books & References
Topic: Old Vacuum Books
Replies: 0
Views: 2211

Old Vacuum Books

<t> The Design And Construction of Small Vacuum Systems by Geoffrey W. Green (181 pages) <br/> Published 1968, which is old enough to talk in some detail about mercury power Diff pumps. <br/> The title describes the contents fairly well. It deals with mainly diffusion pump systems. <br/> <br/> Heade...
by MarkS
Mon Aug 25, 2008 2:40 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: voltage, current, pressure and temperature
Replies: 9
Views: 2400

Re: voltage, current, pressure and temperature

<t>The plasma heats up the walls of the vessel, and other various things. This frees all the gunk stuck into the walls, especially H2O. This, like you said, creates and abrupt rise in pressure, causing run away current. What you want to do is use the plasma to glow clean the inside of the chamber. T...