camilla.compton@LIGO.ORG - posted 14:24, Thursday 04 September 2025 - last comment - 15:00, Thursday 04 September 2025(86737)
SQZ FIS SRCL Offset for Brontosaurus Plot
Sheila, Camilla. While OM2 was hot 86735, we took the data for the SRCL offset SQZ brontosaurs plots as in 84794, 85362, 86422. Plot saved in
camilla.compton/Documents/sqz/templates/dtt/20250904_SRCLSQZdata.xml and attached.| Type | Time (UTC) | SRCL Offset | Angle | DTT Ref |
| FIS SQZ | 21:09:30 - 21:12:30 | -382 | (-)125.4 | ref 1 |
| FIS SQZ | 21:14:45 - 21:17:45 | -200 | (-)151.0 | ref 2 |
| FIS SQZ | 21:19:30 - 21:22:30 | 0 | (-)211.7 | ref 3 |
Took above data at NLG of 24.0, measaured a few hours ago 86729.
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With the SRCL offset that Elenna found best using the plots, -235, we retook some of the 86736 SQZ data set. Plot attached.
| Type | Time (UTC) | SRCL Offset | Angle | DTT Ref |
| FIS SQZ | 21:44:00 - 21:47:00 | -235 | (-)143.4 | ref 4 |
| FIS Mid + SQZ (tuned to no sqz) | 21:48:00 - 21:51:00 | -235 | (-)151.0 | ref 5 |
| FIS Mid - SQZ (tuned to no sqz) | 21:51:45 - 21:54:45 | -235 | (-)122.6 | ref 6 |
| Mean SQZ (ADF off) | 21:56:00 - 21:59:00 | -235 | N/A | ref 7 |
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I used this data and the no sqz data from here to run the so-called "brontosaurus" plot.
The results indicate that the SRCL offset is significantly decreased. The fit gives an offset of -235 ct for the hot OM2, compared to our current -382 ct offset.
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