Reports until 14:45, Thursday 27 February 2025
H1 ISC
thomas.shaffer@LIGO.ORG - posted 14:45, Thursday 27 February 2025 - last comment - 15:24, Thursday 27 February 2025(83089)
Ran A2L script again

We ran the a2l_min_multi_pretty.py script again today since we made changes to the OMC offsets (alog83087). There were minimal gain changes, the only one I updated in lscparams.py was ETMY P from 5.49 -> 5.52.

The range coherence template we normally use was giving odd results during the quiet commissioning times after the OMC reverting, no coherence above 20Hz is seen. Sheila mentions that this is something she has seen before and isn't physical. We ran the script expecting changes but didn't see much change in gains or to the range.

RESULTS

|      |   | Initial | Final |  Diff |
| ETMX | P |   3.23  |  3.24 |  0.01 |
| ETMX | Y |    4.9  |   4.9 |   0.0 |
| ETMY | P |   5.49  |  5.52 |  0.03 |
| ETMY | Y |   1.35  |  1.34 | -0.01 |
| ITMX | P |  -0.53  | -0.54 | -0.01 |
| ITMX | Y |   3.21  |  3.22 |  0.01 |
| ITMY | P |   0.06  |  0.05 | -0.01 |
| ITMY | Y |  -2.74  | -2.75 | -0.01 |
 

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thomas.shaffer@LIGO.ORG - 15:24, Thursday 27 February 2025 (83096)

Matt reminded me that I need to run diaggui_test with the range coherence template, so when I range it the correct way, we can see that the a2l script didn't change much or maybe even made it slightly worse. In the attached screenshot the left is before a2l was run, the right is after.

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