jennifer.wright@LIGO.ORG - posted 17:04, Friday 13 March 2026 (89503)
POPAIR and REFLAIR checks
Jennie W, Sheila D,
I compared the RF monitor values for POPAIR and REFLAIR LSC photodioes between today during state 51 "PRMI LOCKED" and 2026-11-14 22:28:00 UTC in state 50 "ACQUIRE PRMI".
Note we re-aligned both POPAIR B and REFLAIR A yesterday.
POPAIR A RF9 and RF45 have not changed much.
POPAIR B RF18 and RF90 have reduced a lot.
As have REFLAIR A RF9 and RF45.
REFLAIR B RF27 and RF135 have gone up instead of down which seems less worrying for locking purposes.
| Name | 14th Nov[dBm] | Today[dBm] | P_today / P_Nov |
| POPAIR_A_RF9 | -54.8 |
-54.9 |
0.98 |
| POPAIR_A_RF45 | -54.6 | -55 | 0.91 |
| POPAIR_B_RF18 | -49.6 | -53.9 | 0.37 |
| POPAIR_B_RF90 | -46.9 | -51.4 | 0.35 |
| REFLAIR_A_RF9 | -45.4 |
-55.4 |
0.1 |
| REFLAIR_A_RF45 | -37.5 | -54.6 | 0.02 |
| REFLAIR_B_RF27 | -53.1 | -50.0 | 2.0 |
| REFLAIR_B_RF135 | -30.2 | -28.0 | 1.7 |
After this Oli and Sheila re-aligned REFLAIR A (detailed in Sheila's log 89501).
Images attached to this report
