Austin, Betsy, Karla, Rahul
We have finished bonding fused sillica Ears to ETM12 using Hydroxide Catalysis Bonding (HCB) technique, please see pictures attached below for reference. The ear-test mass bond layer has few air bubbles within our tolerance (less than 50 sq mm of the total bond area). We can confirm that the position of both the ears on the two flat surface of the mirror are within the required +-0.1mm.
ETM12 (also see galaxy page for details on the optic) is a our spare test mass mirror between the two sites. The details of the ear and test mass mirror is given below,
- Ear s/n 30077403-04 (Q2300015) is bonded to the flat side S3.
- Ear s/n 30077403-05 (Q2300016) is bonded to the flat side S4.
Both the ears were 22.3 grams heavy (measured using a calibrated scale in a clean room).
The fiducial line measurements on the optic was performed at CIT and the details are posted in E2200356_v1.
I have uploaded the latest version V27 of Jig settings calculation on the DCC.
We still need to measure the total weight of the optic and apply First contact to clean the HR side.
This afternoon Karla and I applied First Contact on the HR side of ETM12 to clean the speckles. See the picture attached below. Later we removed it when it was dry. We then inspected the HR surface and it looks cleaner than before.
Today we measured the mass of ETM12 and it was found to be 39606 grams (Jig + ETM12 =46602grams, Jig= 6996grams).
The humidity in the lab was 40% and temperature was 20.2 degree C (measured using ThermPro borrowed from Rick's PCAL stuff).