This afternoon,
- I wiped the AERM and ETM barrel surfaces as best I could with swabs and methanol to remove particulate.
- Travis and I removed the FirstContact sheet from the optic - upon inspection, we still found some point features within the central ~6" of the optic HR surface. They did not blow away with 20psi N2 Top Gun, nor do they look like FC pieces. I will compare my pictures to the map we made during last year's lab inspection.
- Travis and I checked for charge via the "normal" procedure of looking with an electrometer at the back surface of the AERM with a special bracket. Details below to follow.
- Travis ocked all EQ stops nuts, taking into account sag once under vacuum.
- We set the top 4 QUAD BOSEMs to slightly more closed, also to take into account the sag of the suspensions once under vacuum.
- Removed all tooling, wiped floor and ACB surface.
- Travis swung the ACB back into it's nominal position.
- Jim unlocked the ISI and made a quick medm check.
- Laid new witness CC wafers and optics. - Pulled FC from 2x optics (1 vertical on QUAD, 1 horizontal under QUAD).
Tomorrow we will run TFs in the am and then launch the door crew.
Forgot to mention that just after the FirstContact pull, we installed the electrometer bracket to the back side of the AERM and measured in the Center, and 4 quadrants charge on the electrometer between +/-3V. Data to follow.
Finally getting around to putting in the actual numbers for these measurements taken on May 31, 2018 at 3:30pm. This Quad now has an AERM in the reaction chain.
Procedure: Pulled First Contact, blew all surface and the gap for 60 seconds. Took electrometer readings at 5 locations. UL = -3.1 V, UR = -3.3 V, Center = 3.4 V, LR = 0.1 V, LL = 3.8 V.
Tested electrometer fluctuations by putting the cap on the electrometer head and setting it on the floor of the chamber (no person touching it) and zeroed it. Reading fluctuated betwee 0 and 3 V.
Measured all 5 locations again 10 minutes after the first blow. UL = 2.5 V, UR = 2.0 V, Center = 3.0 V, LR = 2.0 V, LL = 2.0 V.