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Mon Apr 16 16:21:01 2012, tara, Notes, optic, windows for vacuum chamber
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Tue Apr 17 19:51:54 2012, tara, Notes, optic, windows for vacuum chamber
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Thu Apr 19 03:12:23 2012, tara, Notes, optic, windows for vacuum chamber
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Sun Apr 22 23:09:38 2012, tara, Notes, optic, windows for vacuum chamber
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Mon Apr 23 16:52:16 2012, tara, Notes, optic, windows for vacuum chamber
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Wed Apr 25 10:44:29 2012, Frank, Notes, optic, windows for vacuum chamber
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Thu Apr 26 08:35:57 2012, steve, Notes, optic, windows for vacuum chamber
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Fri Apr 27 08:46:24 2012, Frank, Notes, optic, windows for vacuum chamber
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Tue May 1 20:37:16 2012, tara, Notes, optic, windows for vacuum chamber
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Fri May 11 17:52:17 2012, tara, Notes, optic, windows for vacuum chamber
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Wed May 16 22:27:13 2012, tara, Notes, optic, windows for vacuum chamber 
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Mon May 21 16:53:38 2012, tara, Notes, optic, windows for vacuum chamber  
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Wed May 23 15:04:53 2012, steve, Notes, optic, windows for vacuum chamber
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Message ID: 932
Entry time: Mon Apr 23 16:52:16 2012
In reply to: 931
Reply to this: 938
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Author: |
tara |
Type: |
Notes |
Category: |
optic |
Subject: |
windows for vacuum chamber |
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I asked Steve about the choices, he thought the Thorlabs window should be ok for us.
What Steve suggested are:
- The seal between the 10" blank and the windows should be copper seal, (the window already comes with knife edge),so
- the blank will have knife edge seals for two small windows as well.
- Thorlabs window does not have an o-ring between the window frame and the optic, we should add the o-ring between them to avoid a direct metal-glass contact.
About the blank with two openings for beam access, he said a vacuum company could do it for us. I'll make a drawing and get a quote from Nor-Cal and MDC. I have to specify that the blank will be for ultra high vacuum system (UHV).
Quote: |
For small window option, I can either have it made from scratch ( based on LIGO's drawing) or buy the commercial windows from Thorlabs. Here I listed down all pros and cons for each choice as I discussed it with Frank. I 'll ask Steve tomorrow for his opinions.
== Using Thorlabs 2.75" OD windows:==
Pros
- easy to replace for damaged optics,
- ready in short time (parts are in stock)
- minimum time on machine shop
- The thickness of the window is only 0.63", It should be able to fit in the set up which has ~ 1" clearance.
cons:
- Have more rubber seals in the system due to the design, I'll check Cryo:194 to see what will be the minimum pressure we need.
==Making custom parts (like LIGO, see quote window)==
Pros:
- There are only one o-ring used for each window (better vacuum pressure)
cons:
- Spend more time on designing/machining, probably more money for making the parts as well.
- Take longer time if we need more spare pieces.
- The available space for the window is quite limited (1"). If we follow what Zach did for Gyro, it is already to thick for our setup
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