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Message ID: 1727     Entry time: Tue Sep 27 22:17:40 2016
Author: awade 
Type: Misc 
Category: Vacuum 
Subject: New windows on ends of vacuum can 

We want to down size the size of the view port windows so we can have a higher quality IBS AR coated windows and also lower the surface area of fused silica. Fused silica has a relativlty high emissivity at far IR wavelengths at about ~0.75, this will lead to stronger coupling to the lab temperature variations.

Rana has suggested maybe a cone shaped end cap: https://goo.gl/photos/QfRoyrRAczHSjbpr5 . This comes to a point where a conflat mountable assembly with a small window could be fitted. We could also use a flat plate and attach a window to that. This seems like it would easier to manufacture. 

After talking to people, it turns out the cryo people are planning on making their own (Johannas is supposed be drafting something like this I think). We should probably try to have one standard size between experiments to save work.  

Before talking to cryo people, I had drafted up a simple assembly (attached below) that would make use of the following off the shelf parts:

This may be faster to build than a cone and serve the same basic purpose of minimizing the area of window. These accuglas 1.33"CF mounts take optics that are diameter 0.874" (thickness.159"), which seems propriatory and maybe not ideal if we want to get our own custum coatings or make changes in the future.  It sound like there might be a few 1" wedged AR coated windows maybe at the 40 m, if this is the standard size, then it might be better to find a different mount.
I have attached drafts of the above parts put together as a first draft and kick off elog posts on topic.
Attachment 1: DMountStyleWindowMounting1.JPG  608 kB  | Hide | Hide all
Attachment 2: DMountStyleWindowMounting4.JPG  636 kB  | Hide | Hide all
Attachment 3: 110032_10InchBlank_WtHolesForPorts.PDF  43 kB  | Hide | Hide all
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