On 1 October 2012 05:35, Kent A. Reed <[email protected]> wrote:
> It's been 40 years since I did any serious sputtering Not quite so long for me, nearer 20, but I suspect that the equipment was the same age. > Typically, we had a christmas tree of aneroid gauge, > thermocouple gauge, Pirani gauge, and Penning gauge or some such, to > cover the pressure range, but we wore belts and suspenders:-) I recall a valve for switching between Pirani and Penning, I also recall that we had a mechanical roughing pump then an oil diffusion pump which were operated in manual sequence. Much more recently I worked for an X-ray microscope maker (nice toys: http://www.nordson.com/en-us/divisions/dage/products/ExampleProductFamily/Pages/CTOption.aspx the picture there shows in-situ BGA balls and bond-wires.) and I was amazed how simple it now was. Just one turbomolecular pump achieved vacuums unheard-of with the diffusion pump, and without spending hundreds on diff pump oil on a regular basis. http://en.wikipedia.org/wiki/Turbomolecular_pump seems to suggest that you still need a backing pump, it is possible that this was built-in to the TM pump on the X-ray tubes. (I didn't pay that much attention, as I was working on the development of a sealed-for-life version of the tube) > As my grandkids grow, I feel the itch to have a vacuum bench in the > basement for "Ask Mr Wizard" kinds of experiments. Anything so long as > it doesn't generate X-rays. But X-rays are fun! -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
