Reports until 15:58, Thursday 01 March 2018
H1 AOS (AOS, ISC, SUS)
georgia.mansell@LIGO.ORG - posted 15:58, Thursday 01 March 2018 - last comment - 13:01, Friday 02 March 2018(40793)
TMS adjusted to align ALS retroreflection

[Keita, Georgia]

With the new EY alignment, Keita and I adjusted the TMS pitch and yaw to steer the green ALS beam (reflected off ETMY) back onto the in-air table.

Keita adjusted one of the weights on the TMS table to improve the alignment in pitch. It is now 4" from where it was in O2, in the -y direction.

The TMS slider values are now P = 14.6 urad, Y = -217 urad, with the reflection roughly aligned. The full slider range in pitch is +/- 608 urad, so we think even with this rather large offset there is enough range to steer the beam 1m over 4km.

Finally, some of the OSEM sensors on the upper stage of the TMS suspension are not in the center of their range, something we might want to go back in and fix.

Comments related to this report
betsy.weaver@LIGO.ORG - 17:18, Thursday 01 March 2018 (40796)

I've taken all 6 degree of freedom transfer functions and everything looks good there.  Will post results soon.

keita.kawabe@LIGO.ORG - 13:01, Friday 02 March 2018 (40807)

"Weight" that was shifted by 4" (relative to O2) is a 1/4-20 socket head screw, probably half inch long, that is attached to the TMS optics table for balancing purpose.