|
40m
QIL
Cryo_Lab
CTN
SUS_Lab
TCS_Lab
OMC_Lab
CRIME_Lab
FEA
ENG_Labs
OptContFac
Mariner
WBEEShop
|
| PSL |
Not logged in |
 |
|
|
 Mon Apr 16 16:21:01 2012, tara, Notes, optic, windows for vacuum chamber
|
 Tue Apr 17 19:51:54 2012, tara, Notes, optic, windows for vacuum chamber 
| |
Thu Apr 19 03:12:23 2012, tara, Notes, optic, windows for vacuum chamber
| |
Sun Apr 22 23:09:38 2012, tara, Notes, optic, windows for vacuum chamber
| |
Mon Apr 23 16:52:16 2012, tara, Notes, optic, windows for vacuum chamber
| |
Wed Apr 25 10:44:29 2012, Frank, Notes, optic, windows for vacuum chamber
| |
Thu Apr 26 08:35:57 2012, steve, Notes, optic, windows for vacuum chamber
| |
Fri Apr 27 08:46:24 2012, Frank, Notes, optic, windows for vacuum chamber
| |
Tue May 1 20:37:16 2012, tara, Notes, optic, windows for vacuum chamber
| |
Fri May 11 17:52:17 2012, tara, Notes, optic, windows for vacuum chamber
| |
Wed May 16 22:27:13 2012, tara, Notes, optic, windows for vacuum chamber
| |
Mon May 21 16:53:38 2012, tara, Notes, optic, windows for vacuum chamber
| |
Wed May 23 15:04:53 2012, steve, Notes, optic, windows for vacuum chamber
|
|
|
Message ID: 938
Entry time: Wed Apr 25 10:44:29 2012
In reply to: 932
Reply to this: 940
|
| Author: |
Frank |
| Type: |
Notes |
| Category: |
optic |
| Subject: |
windows for vacuum chamber |
|
|
I don't know how you gonna make the knife edge on the 10" flange of centered and wedged! If you put the small CF flanges on the big one you have parasitic cavities between the window and the cavity even if the window is wedged (only the outside is tilted relative to the flange, the inside is parallel by design. I also suggest going for a metal seal, but not copper as getting those knife edges will be complicated and expensive i guess. So why not using indium or the other single-use metal seal replacement techniques for o-rings available and you only need a flat surface on the big flange and a few tapped blind holes?
| Quote: |
|
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
|
|
|