Reports until 18:27, Wednesday 24 January 2018
H1 SUS
travis.sadecki@LIGO.ORG - posted 18:27, Wednesday 24 January 2018 - last comment - 16:17, Thursday 25 January 2018(40262)
ETMy fiber welding update

A. Bell, J. Oberling, D. Sellers, T. Sadecki, K. Toland

The final 2 fibers were welded to the new ETMy.  The monolithic was successfully suspended and IAS measurements were taken.  I'll let Jason fill in the numbers, but the differential pitch is a bit larger than we generally hope for but not grossly so.  Good work team!

Violin mode measurements to commence tomorrow.

Comments related to this report
jason.oberling@LIGO.ORG - 16:17, Thursday 25 January 2018 (40278)

Final alignment numbers for the new ETMy monolithic.  All measurements were done with the ETMy suspended; the PUM and UIM were both locked.  All numbers assume the reader is looking in the -Y direction (i.e. at the AR surface of the ETMy); this is opposite the notation used in the alignment notebook, which is done from the perspective of the aligment equipment (i.e. looking at the HR surface of the ETMy).  The pitch measurement was done after this afternoon's correction of the differential pitch; before the correction the differential pitch was 5.53 mrad down.

  • Roll
    • PUM: 0.0 mm
    • ETMy: 0.1 mm CCW
  • Pitch
    • PUM: 505 µrad up
    • ETMy: 1.01 mrad up
    • Differential: 505 µrad up
  • Fiber Stretch
    • Left: 6.2 mm
    • Right: 6.2 mm
  • PUM/ETMy Center of Mass Separation
    • Left: 602.0 mm
    • Right: 601.8 mm

The serial numbers of the fibers used and their locations in the monolithic are as follows:

  • +X/+Y
    • S1400157
  • -X/+Y
    • S1400159
  • -X/-Y
    • S1800491
  • +X/-Y
    • S1800486