Updated ASC-AS_A_DC_YAW_OFFSET to be -0.15 instead of OFF at 00:09:36 UTC as even though this change has now been put in the guardian we have not lost lock since this was done by Sheila and so the offset was still off. I checked with the squeezers first.
just noting for our future selves: Sheila updated the guardian in LHO:76488.
Ibrahim, Jennie W
I analysed the DARM offset step test that Ibrahim ran over the weekend. The contrast defect is now 1.149mW.
See the attached plot for DCPD sum level and circulating power level during the test. DCPD_SUM_OUT is nominally at 40mA before and after the test. The first attached plot uses the height of two calibration lines on the DCPD and in DARM to track how the DARM optical gain changes with differing power on DCPD sum. The second shows the scaling of DARM optical gain with DARM offset. From this we can see the DARM offset true zero is when the applied offset in OMC-READOUT_X0_OFFSET is 0.608 counts.
