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Message ID: 1756     Entry time: Fri Nov 4 12:59:11 2016
Author: awade 
Type: Misc 
Category: Drawings 
Subject: Vacuum tank view port masking shields 

I have asked Eddie to have a look at some masking shields for the vacuum tank's 8" viewports.  He will look at the drawings and seek out someone to build and polish them. This is to help with reducing the emissivity as viewed from inside the tank looking towards the viewports.  Fused silica has a epsilon>0.75, a shiny mask coving all but the spots where light is coupled in/out should improve the radiative thermal isolation from the tank.

I've attached the drawings of my initial sketch. In the process I also did an update of all the Solidworks assemblies that we have in the SVN, these were largly drawn in the student version of Solidworks and were useless for generating drawings and assemblies.  I have now updated all the parts and assemblies, there are now no student version files. All of these has been updated in (root)/trunk/CTNLab/current/drawings/dual_refcav/ of the 40m SVN . In an effort to reduce the entropy of this directory, I have broken the reference cavity drawings into subassembly folders so individual sub-systems can be edited separately. 

Is 0.5" a big enough hole for our beams to get in/out?

To get the drawings follow instuctions here: https://wiki-40m.ligo.caltech.edu/How_To/Use_the_SVN_archive

Attachment 1: AssembledEndShield.PDF  59 kB  | Hide | Hide all
AssembledEndShield.PDF
Attachment 2: EndMaskShieldingWindow.PDF  67 kB  | Hide | Hide all
EndMaskShieldingWindow.PDF
Attachment 3: FixingBlocks.PDF  62 kB  | Hide | Hide all
FixingBlocks.PDF
Attachment 4: Fully_Assembled_Tank_Stack_And_Cavites_ExplodedView.PDF  107 kB  | Hide | Hide all
Fully_Assembled_Tank_Stack_And_Cavites_ExplodedView.PDF
Attachment 5: spingyband.PDF  59 kB  | Hide | Hide all
spingyband.PDF
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