Optical Cryostat (Janis ST-100): Difference between revisions

Revision as of 16:04, 11 July 2014

There is a hard copy of the manual in the lab.

Here are some random useful pieces of information to know gathered mostly from emails with Dan Logan from Janis:

The ST-100 is designed to hold and operate at $10^{-4}$ Torr and the seals should hold this pressure for "several hours if not several days".

It seems like this is not the case.

With continuous evacuation with a turbo pump the pressure should be able to reach $10^{-5}$ or $10^{-6}$ Torr, the ladish gaskets on the cryostat aren't able to hold this high of a vacuum without the pump on though.

The performance of the cryostat will be better but the pressures as low as $10^{-3}$ Torr can be acceptable.

The ST-100 should not be baked out because the window block and electrical feedthroughs are sealed using epoxy and baking out the cryostat might cause the epoxy to melt.

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 [https://wiki.physics.wisc.edu/yavuz/images/c/c3/ST-100_Drawing.pdf Technical Drawing]
+==Notes==
+Here are some random useful pieces of information to know gathered mostly from emails with Dan Logan from Janis:
+* The ST-100 is designed to hold and operate at <math>10^{-4}</math> Torr and the seals should hold this pressure for "several hours if not several days".
+::It seems like this is not the case.
+* With continuous evacuation with a turbo pump the pressure should be able to reach <math>10^{-5}</math> or <math>10^{-6}</math> Torr, the ladish gaskets on the cryostat aren't able to hold this high of a vacuum without the pump on though.
+* The performance of the cryostat will be better but the pressures as low as <math>10^{-3}</math> Torr can be acceptable.
+* The ST-100 should not be baked out because the window block and electrical feedthroughs are sealed using epoxy and baking out the cryostat might cause the epoxy to melt.