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Entry  Mon Apr 16 16:21:01 2012, tara, Notes, optic, windows for vacuum chamber 
    Reply  Tue Apr 17 19:51:54 2012, tara, Notes, optic, windows for vacuum chamber IMG_0757.jpg
       Reply  Thu Apr 19 03:12:23 2012, tara, Notes, optic, windows for vacuum chamber 
          Reply  Sun Apr 22 23:09:38 2012, tara, Notes, optic, windows for vacuum chamber 
             Reply  Mon Apr 23 16:52:16 2012, tara, Notes, optic, windows for vacuum chamber 
                Reply  Wed Apr 25 10:44:29 2012, Frank, Notes, optic, windows for vacuum chamber 
                   Reply  Thu Apr 26 08:35:57 2012, steve, Notes, optic, windows for vacuum chamber 
                      Reply  Fri Apr 27 08:46:24 2012, Frank, Notes, optic, windows for vacuum chamber 
                         Reply  Tue May 1 20:37:16 2012, tara, Notes, optic, windows for vacuum chamber 
                            Reply  Fri May 11 17:52:17 2012, tara, Notes, optic, windows for vacuum chamber O-Rings.pdf.zip
                               Reply  Wed May 16 22:27:13 2012, tara, Notes, optic, windows for vacuum chamber 2_small_window.PDFblank_10_wedge.PDF
                                  Reply  Mon May 21 16:53:38 2012, tara, Notes, optic, windows for vacuum chamber edit_blank_10_wedge.PDFwindow_assembly.PDFwindow_assembly2.PDF
                                     Reply  Wed May 23 15:04:53 2012, steve, Notes, optic, windows for vacuum chamber 
Message ID: 932     Entry time: Mon Apr 23 16:52:16 2012     In reply to: 931     Reply to this: 938
Author: tara 
Type: Notes 
Category: optic 
Subject: windows for vacuum chamber 

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

Quote:

 

I'm searching DCC for window/viewport examples. The following drawings give me some ideas how to make a window for our setup.

 TCS viewports details

double viewports

septum window flange

 

 

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