As requested on Slack, see here.
September 13 2018 (9/13/2018)
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warm metrology measurement completed for RTM-012. CryoPlate temperature appeared to be +30C for the duration of the measurement. (no temperature measurements for the RSA)
Results look good (see attached). It's obviously an e2v based raft, with quantile 0.50 at 42.8076mm. Cool down whenever appropriate, <@U2LU22P4N> and/or <@U834UTDPS>.
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Beginning warm metrology measurement of RTM-012 while pumping down. CryoPlate temperature gives something like 31C - typical of the condition when
pumpdown is performed (to reduce as much H2O as possible. RSA is obviously somewhere between 20 and 30C. After aligning the first time,
I was shocked - SHOCKED(!) to witness that TS7-1 on TS5 optical table shifted by 1-2mm (occurred when Yousuke and I were attaching the back flange
for pumpdown following aliveness test). Noticed that one of the kinematic tooling balls was touching only 1 of 2 tooling cylinders on the E side of
the room. I cut one of 3 cable ties used for seismic fixturing but that didn't fix the problem. Apparently the friction against the ball on the flat
(W side of room) was sufficient to keep the E side above its landed position. Should have checked for proper landing before aligning. Reperformed
alignment, which required a ~2mm axial correction with the displacement sensor and ~1mm lateral (vertical) correction to recover alignment. I guess
I didn't realize that gravity might not be sufficient to bring TS7-1 back into a repeatable position with the existing kinematic components. measurement should be complete by the morning sometime (8am or so?)
May 2, 2018 (5/2/2018)
