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Cold trap used in the 15-inch diameter CVC diffussion pump in the Mount
Wilson Observatory Coating Lab. The steel ring was designed at Mount Wilson,
turned by the machine shop at the University of Illinois and the copper
work built and installed by Associated Vacuum in Covina, CA.
Due to a harsh winter and poor temperature controll, the steel plate rusted to the point it had to be treated with Naval Jelly and Gempler's rust paint before it could be used this year. Moral of the story, don't leave bare metal around. |
| This is the flange of the CVC diffusion pump. This is a high capacity
pump, needed as it connects to a bell jar that is 108" x ~50". That is
a lot of volume to bring down to better than 2x10-5 torr.
The new and freshly painted cold trap mates up against this flange, between the pump and the bell jar. The idea is for any hot diffusion pump oil to be condensed out before it can get to the nice piece of clean glass (like the 100-inch mirror) in the bell jar. |
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This is a new trigger board developed for the Excimer laser system of UnISIS. It has nothing to do with vacuum system, but is here so I dont forget where I put the image. |