camilla.compton@LIGO.ORG - posted 12:10, Friday 14 March 2025 (83370)
SQZ NLG Data Set
Sheila, Camilla
NLG Measurements (follow 76542):
| opo_grTrans_ setpoint_uW | Amplified Max | Amplified Min | UnAmp | Dark | NLG (usual) | NLG (maxmin) | OPO Gain |
| 120 | 0.05615 | 0.000255 | 0.000946 | 2.5e-5 | 61.0 | 62.7 | -12 |
| 110 | 0.03241 | 0.000273 | 35.2 | 35.4 | -11 | ||
| 90 | 0.01494 | 0.000288 | 16.2 | 16.8 | -9 | ||
| 70 | 0.008177 | 0.000319 | 8.9 | 9.2 | -7 | ||
| 40 | 0.003717 | 0.000392 | 4.0 | 4.2 | -4 | ||
| 25 | 0.002531 | 0.000464 | 2.7 | 2.8 | -2 | ||
| 80 | 0.010866 | 0.000302 | 11.8 | 12.2 | -8 |
For 25uW we needed to reduce H1:SQZ-OPO_PZT_1_SCAN_TRIGGER_CHANNEL_1_LEVEL from 0.5 to 0.25
Data saved to camilla.compton/Documents/sqz/templates/dtt/20250314_NLG.xml
Example of data attached. Interestingly when we took the intal NO SQZ data, DARM looks different than in 2024, attached, using H1:CAL-DELTAL_EXTERNAL_DQ
FC2 is misaligned during this dataset. Aimed for 3m30 of data for each point.
In the Mean SQZ data, there was a strange peak around 300Hz, we checked if tis was seeding by moving H1:SQZ-LO_SERVO_SLOWOUTOFS, this made no difference
| Type | Time (UTC) | NLG | SQZ dB @ 1kHz | Angle | DTT Ref |
| No SQZ | 16:18:30 - 16:22:30 | N/A | N/A | ref 0 | |
| ASQZ | 16:34:30 - 16:38:00 | 61 | 21.2 | (-)86 | ref1 |
| ASQZ -10deg | 16:38:30 - 16:42:00 | 61 | 20.1 | (-)75 | ref2 |
| SQZ | 16:45:00 - 16:48:30 | 61 | -4.5 | 166 | ref3 |
| MSQZ | 16:49:00 - 16:52:30 | 61 | 18.6 | N/A | ref4 |
| ASQZ | 17:04:30 - 17:08:00 | 35 | 19.2 | (-)88 | ref5 |
| SQZ | 17:11:30 - 17:15:00 | 35 | -4.6 | 170 | ref6 |
| MSQZ | 17:15:30 - 17:19:00 | 35 | 16.3 | N/A | ref7 |
| ASQZ | 17:31:00 - 17:34:30 | 16 | 15.4 | (-)93 | ref8 |
| SQZ | 17:38:00 - 17:41:30 | 16 | -4.6 | 157 | ref9 |
| MSQZ | 17:42:00 - 17:45:30 | 16 | 12.4 | N/A | ref10 |
| ASQZ | 17:55:30 - 17:59:00 | 9 | 12.5 | (-)96 | ref11 |
| SQZ | 18:03:00 - 18:06:30 | 9 | -4.5 | 161 | ref12 |
| MSQZ | 18:07:00 - 18:10:30 | 9 | 9.5 | N/A | ref13 |
| ASQZ | 18:18:30 - 18:22:00 | 4 | 8.2 | (-)114 | ref14 |
| SQZ | 18:25:00 - 18:28:30 | 4 | -3.9 | 155 | ref15 |
| MSQZ | 18:29:00 - 18:32:30 | 4 | 5.5 | N/A | ref16 |
| ASQZ | 18:48:00 - 18:51:30 | 2.7 | 5.9 | (-)115 | ref17 |
| SQZ | 18:52:30 - 18:56:00 | 2.7 | -3.4 | 155 | ref18 |
| MSQZ | 18:57:30 - 19:01:00 | 2.7 | 3.6 | N/A | ref19 |
Images attached to this report
