20180314

Today's activities

Workers: Miyo, Akutsu

In the morning (around 9:44 JST), set calibration factors to the oplev model based on the Miyo-kun's report on Feb 1 2018.
- The method is reported here.
- Pitch: (was) 1100 -> (is) 75.75
- Yas: (was) 1000 -> (is) 83.33
TCam's illuminator seems to put spike noises every 10 minutes; see here.
- Actually Akutsu tried to take long-term spectra of the local sensors but some averaged results showed sudden wide-spectral bump and seemed spike noise.
- Are Asking CAL to reduce the illumination timing ratio.
IYC pumping down started by Kimura-san; see here
- The effects are reported here.
- Some comments.
[Ongoing] Need cares of water springs from anchor bolts for oplev pylons.
[Ongoing] Need to confirm what are the scratch lines made by the measurement by the KEK team last week.

Check the balance of the suspended WAB with some wires and sensors are attached.
Check how the damping would be now after the replacement of the damping magnets.
Check the reproducibility of the alignment of the suspension among several modes.
Check heights of several points.
Take care of water spring??

Good rail(?) to move the WAB suspension in the cryostat in the main beam direction.
Chain block? to support the load in the chamber.