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Entry  Mon Jul 26 01:30:42 2021, Koji, Summary, Cryo vacuum chamber, Prep for the 2nd cooling of the suspension 
    Reply  Mon Jul 26 22:49:00 2021, Koji, Summary, Cryo vacuum chamber, Aquadag painting 10x
       Reply  Wed Jul 28 00:59:47 2021, Koji, Summary, Cryo vacuum chamber, The test mass successfully suspended P_20210727_154143.jpegP_20210727_190356.jpegP_20210727_190426.jpegP_20210727_190543.jpeg
          Reply  Thu Jul 29 00:42:38 2021, Koji, Summary, Cryo vacuum chamber, The test mass successfully suspended 
             Reply  Thu Jul 29 13:11:17 2021, Koji, Summary, Cryo vacuum chamber, Cooling progress: Update temp_log_cool_down_20210728_1830.pdfcooling_model1.pdfcooling_model2.pdfOSEM_cooling.pdf
                Reply  Fri Jul 30 12:22:56 2021, Koji, Summary, Cryo vacuum chamber, Cooling curve comparisons comparison_cold_head.pdfcomparison_inner_shield.pdfcomparison_test_mass.pdf
                   Reply  Sun Aug 1 22:22:00 2021, Koji, Summary, Cryo vacuum chamber, Cooling update temp_log_cool_down_20210728_1830.pdfcooling_meas.pdfOSEM_cooling.pdfcooldown_210728.zip
                      Reply  Mon Aug 2 13:25:32 2021, Stephen, DailyProgress, Cryo vacuum chamber, Warmup started 02 August 
                         Reply  Tue Aug 3 23:56:00 2021, Koji, DailyProgress, Cryo vacuum chamber, Warmup started 02 August P_20210804_000247.jpgP_20210803_235421.jpg
Message ID: 2619     Entry time: Mon Jul 26 22:49:00 2021     In reply to: 2618     Reply to this: 2620
Author: Koji 
Type: Summary 
Category: Cryo vacuum chamber 
Subject: Aquadag painting 

[Stephen Koji]

We decided to paint the silicon test mass with Aquadag to increase the emissivity of the test mass.

Stephen brought the Aquadag kit from Downs (ref. C2100169) (Attachment 1)

It's a black emulsion with viscosity like peanut butter. It is messy and smells like squid (Ammonium I think) (Attachment 2)

We first tried a scoop of Aquadag + 10 scoops of water. But this was too thin and was repelled easily by a Si wafer.
So we tried a thicker solution: a scoop of Aquadag + 4 scoops of water. (Attachment 3)

The thicker solution nicely stayed on the Si wafer (Attachment 4)

We want to leave the central area of the barrel unpainted so that we can put the suspension wire there without producing carbon powder. (Attachment 5)
1.5" from the edge were going to be painted. The central1" were masked.

The picture shows how the Si test mass was painted. The test mass was on a V-shaped part brought from the OMC lab. The faces were also painted leaving the mirror, while the place for RTD, and the magnet were not painted. (Attachment 6)

It looked messy while the painting was going, but once it started to dry, the coating looks smooth. It's not completely black, but graphite gray. (Attachment 7)

After the test mass got dry, another layer was added. (Attachment 8)

Then made it completely dry. Now the mask was removed. Nice! (Attachments 9/10)

Attachment 1: 20210726164254_IMG_0768.jpeg  2.061 MB  Uploaded Mon Jul 26 23:49:05 2021  | Hide | Hide all
Attachment 2: 20210726164530_IMG_0769.jpeg  2.287 MB  Uploaded Mon Jul 26 23:49:09 2021  | Hide | Hide all
Attachment 3: 20210726164225_IMG_0766.jpeg  2.760 MB  Uploaded Mon Jul 26 23:49:13 2021  | Hide | Hide all
Attachment 4: 20210726164957_IMG_0772.jpeg  2.629 MB  Uploaded Mon Jul 26 23:49:16 2021  | Hide | Hide all
Attachment 5: 20210726173608_IMG_0774.jpeg  2.753 MB  Uploaded Mon Jul 26 23:49:19 2021  | Hide | Hide all
Attachment 6: 20210726174523_IMG_0775.jpeg  2.942 MB  Uploaded Mon Jul 26 23:49:30 2021  | Hide | Hide all
Attachment 7: 20210726182715_IMG_0783.jpeg  2.974 MB  Uploaded Mon Jul 26 23:49:34 2021  | Hide | Hide all
Attachment 8: 20210726192042_IMG_0784.jpeg  2.923 MB  Uploaded Mon Jul 26 23:49:37 2021  | Hide | Hide all
Attachment 9: 20210726192837_IMG_0790.jpeg  3.300 MB  Uploaded Mon Jul 26 23:49:43 2021  | Hide | Hide all
Attachment 10: 20210726192853_IMG_0791.jpeg  3.343 MB  Uploaded Mon Jul 26 23:49:49 2021  | Hide | Hide all
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