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Entry  Tue Mar 22 16:29:04 2016, tara, DailyProgress, PMC, Epoxy glue on PMC mirror and PZT 
    Reply  Thu Mar 24 19:07:38 2016, tara, DailyProgress, PMC, Epoxy glue on PMC mirror and PZT 
       Reply  Sat Mar 26 13:36:09 2016, tara, DailyProgress, PMC, Epoxy glue on PMC mirror and PZT IMG_2468.JPGIMG_2466.JPG
          Reply  Tue Mar 29 23:23:37 2016, rana, DailyProgress, PMC, Epoxy glue on PMC mirror and PZT 
             Reply  Wed Mar 30 08:29:15 2016, tara, DailyProgress, PMC, test on new PMC IMG_2528.JPGIMG_2540.JPG
                Reply  Wed Mar 30 10:28:44 2016, Evan, DailyProgress, PMC, test on new PMC 
                   Reply  Thu Mar 31 15:11:27 2016, tara, DailyProgress, PMC, test on new PMC 
                      Reply  Tue Apr 5 16:32:36 2016, tara, DailyProgress, PMC, test on new PMC 
                         Reply  Wed Apr 6 15:02:50 2016, tara, DailyProgress, PMC, test on new PMC 
                            Reply  Fri Apr 8 09:44:49 2016, tara, DailyProgress, PMC, test on new PMC IMG_2634.JPGIMG_2635.JPGIMG_2633.JPG
Message ID: 1613     Entry time: Tue Mar 22 16:29:04 2016     Reply to this: 1614
Author: tara 
Type: DailyProgress 
Category: PMC 
Subject: Epoxy glue on PMC mirror and PZT 

[Antonio,Tara] We glue PMC back mirror to PZT and wait for it to settle.

Since we have all parts for the steel PMC (body/PZT/Mirrors) we start putting it together. The first step is using epoxy to glue the back mirror to the PZT.

There is a little problem. The soldering tin on the PZT gets a bit to the edge of the PZT, see picture. When we put the PZT on the steel end cap, one side of the soldering tin electrically connects to the end cap.

So we decide to put a kapton tape as an insulator between the pzt and the end cap. (We thought about resoldering the tin, but we were not sure if we would make it worse).

It is quite hard to center the mirror-pzt on the end cap, so we plan to use a fixture to keep the mirror center at the end cap. It will be something similar to the plastic piece we used for cavity-mirror assembly.

We want the mirrors' positions to be as precise as possible to reduce clipping loss, and beam alignment problem.

See the rest of the picture in Picasa

 

Note about epoxy: The epoxy we use is EP-30 (suggested by Rick Savage, provided by Callum). There's a test procedure to check if we mix the epoxy correctly or not.

After mixing the epoxy, you have to put a small amount of epoxy in an oven at 200 F for 15 minutes to check if the mixture is good or not.

If the epoxy in test came out smooth and hard, it is good. You can proceed with the work. We tested that, and our mixture was good.

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