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I've been working on a high vacuum project that should make it easy for almost anyone to copy with only basic hand tools. The links are to the fusor site where I spend most of my time ranting about

Vladimir, Yes that true i should have put them up before. I put up some pictures on it now if perhaps anybody else want to comment on this or so. Yes i think ill go with to cool it down in some way,

Henry, Yes, I see now... The pictures would be great to avoid misunderstanding. Anyway, If your cool down your baffle and walls around it, it just will work better. Best regards, Vladimir

Vladimir, I think you misunderstood me a little. The whole chamber which is flat in contruction but long and where the diffusionpump is connected to in one end looks like an L that is turned 90 degree

Henry, Actually for 50 mm flange you can use any 50 mm flange valve, but you're right - it is practically impossible to find something for $50 including shipping... Just shipping cost may be more than

Vladimir, Thanks for the answer! Yes i would like a gate or butterfly valve there absolutely and i have searched. The only place i know is Ebay and the only one i found that would fit, and most likely

Henry, You done a great job! Please don't destroy it trying to use difpump without gate! There may be a lot of scenarios how to use it without gate, and on practice they all have negative results,

Hello guys! I have finally built together a small simple high vacuum system with a diffusionpump and the vacuum only goes up from little under 1 milliTorr to 1.2 Torr in 2 days when all valves are

I would expect that would not be a problem as long as you are pumping faster than it out-gasses. ;-)

S, brian whatcott pi?e:

S, Simon Quellen Field pis(e: As I already say. That pump is just nice to see. But import taxes and distribution take the price over $250. Sorry.

It's OK. With distance about 60 cm you can work up to about 5x10-4 torr. The problem is that Al thin films being deposited on substrate capture gas molecules, and that issue decreases deposited film

The distance from the coil to the mirror is about 60 cm (2 feet) in our chamber. Our pressure gauge, which I don't necessarily believe, indicates that we get down to about 7 x 10^ -5 to 1 x 10^4 torr,

Molecules free mean path about 1 meter and more is when pressure in the chamber is below about 2x10-4 torr. Actually for Al evaporation than pressure is less, than better. The best is below 2x10^-5

Sorry, I didn't pay attention on smilings...:-) :-D :-P Talking seriously - PLUS wall material vapor pressure at the given temperature, PLUS gas permeation through the chamber walls and seals, PLUS

That's great! Negative eight-tenths of a bar! Wow! You sure you didn't create a black hole witrh that thing? ;+) Guy Brandenburg, Washington, DC http://gfbrandenburg.wordpress.com/

Sorry, Vladimir, as Simon points out, I was joking. The weird spelling was supposed to be a clue to that. I should have added a smiley face for the benefit of those who aren't familiar with American

He was joking. ;-) Carrying your analysis a little farther, however, what is the vapor pressure of the walls of your vacuum chamber at room temperature? But we're clearly getting pedantic here, which

If you even passed through indicated 10 torr, 10^-1 torr, 10^-3 torr, 10^-6 torr, 10^-9 torr, 10^-11 torr, 10^-14 torr, and then your meter indicates ZERO - it means that you have reached edge of your

Sad to tell, by the time I sourced the 3 inch diam vacuum gauge and plumbed it directly to the flare outlet on the pump, to read a magnificent -0.8 bar - it was a little late to go to the dealer with