matthewrichard.todd@LIGO.ORG - posted 09:34, Thursday 13 November 2025 (88088)
OMC scan with SQZ beam and cold OM2, changing ZM4/5 -- 20251113
M. Todd, S. Dwyer
We wanted to get a couple of measurements of the OMC mismatch with the SQZ beam when we changed from the nominal setting for only one of the ZMs at a time. OM2 was cold for all of these measurements.
| Measurement | Time | OMC Mismatch [%] |
| ZM4 = 6.2, ZM5 = -0.4 (nominal) | 1447088389 | 2.8 |
| ZM4 = 4, ZM5 = -0.4 | 1447088919 | 2.4 |
| ZM4 = 6.2, ZM5 = -4.5 | 1447089464 | 10.5 |
It seems the ZM4 is not a very strong actuator for changing the mode at the OMC.
Images attached to this report
