nutsinee.kijbunchoo@LIGO.ORG - posted 16:35, Thursday 27 April 2023 - last comment - 10:43, Friday 28 April 2023(69116)
Added fudge factor to SQZ BLRMS
I added fudge factors to squeezer BLRMS NULL gain so the monitors read 0dB when we are not squeezing. All of the changes have been accepted in SDF.
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| BLRMS | 30mins after NLN (brown trace) | 3 hours after NLN (mint trace) | Comment | |||
| # | center freq | BLRMs calc | DARM calc | BLRMs calc | DARM calc | |
| 1 | 80Hz | n/a (new lines) | -0.9 | n/a | -0.4 | Check for lines |
| 2 | 135Hz | -1.2 | -1.4 | -0.8 | -1.4 | A bit off |
| 3 | 325Hz | -1.5 | -1.9 | -1.8 | -2.3 | Underestimated |
| 4 | 750Hz | -2.4 | -2.5 | -3.0 | -3.1 | Great |
| 5 | 1700Hz | -2.2 | -2.1 | -3.2 | -3.0 | Great |
| 6 | 4650Hz | 0 | 0 | -1.8 | -1.8 | Great |
Checking on the reliability of these BLRMs by comparing the BLRMs H1:SQZ-DCPD_RATIO_{1-6}_DB_MON with DARM SQZ vs No SQZ. Above 750Hz, BLRMS#4,5,6 exactly agree with whats seen in DARM.
#1 80Hz BLRM isn't making sense, maybe we're not taking into account the PCALX 77.7Hz line (alog68289). #3 325Hz seems like the scaling is underestimating SQZ in the BLRMS and something is off with #2 135Hz but this is a region we've ben seeing varying noise.
"BLRMS calc" is the mean of H1:BLRMs H1:SQZ-DCPD_RATIO_{1-6}_DB_MON at the time. Note the attached plot is just the mean and not showing the min/max which is quite noisy.
"DARM calc" is me, by eye using DTT cursors, seeing the difference in dB (SQZ overview > DARM FDS template) between SQZ and no SQZ centered in the BLRMS frequency in the attached DARM plot.
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