Reports until 15:55, Wednesday 25 April 2018
H1 IOO
jenne.driggers@LIGO.ORG - posted 15:55, Wednesday 25 April 2018 (41670)
IMC A2L, spot positions

After rephasing the IMC RF stuff (alog 41669), I did a quick A2L to see where the spots are.

The most recent measurements, from before the EOM and PMC swaps, are in alog 40422 (I'm using the A2L coeff from that alog, and recalculating the positions, so that the sign convention is consistent on my table here).  The method is from alog 31402.

Overall, we do see some shift, but it's not gigantic except for the short arm between MC1 and MC3 in yaw.

  positions 5 Feb 2018 [mm] positions 25 Apr 2018 [mm] A2L coeff 25 Apr 2018
MC1 P -0.4 -1.6 -0.8
MC1 Y -0.8 -3.8 -1.9
MC2 P -4.1 -4.2 -2.1
MC2 Y 1.1 1.2 0.6
MC3 P -0.5 -0.8 -0.4
MC3 Y -0.8 2.4 1.2