oli.patane@LIGO.ORG - posted 15:46, Monday 21 September 2026 (91998)
QOSEM BBSS M1 sat amp whitening modification Timeline and Comparison
Wanted to compile a table of the whitening changes that we've made to the QOSEM BBSS M1 satamp and how each modification has lowered the time constant. With our current settings, our time constant is 4 seconds, which is much nicer for not saturating compared to the original design, whose time constant was 23 minutes.
| Whitening zpk | Compensation zpk | LHO implementation | LLO implementation | Time Constant (s) | |
|---|---|---|---|---|---|
| Original Design | zpk([720e-6],[145e-3],1,"n") | zpk([145e-3],[720e-6],1,"n") | -- | -- | ~1400 |
| 1st Modification (CIT:1028) | zpk([0.0144],[2.89],1,"n") | zpk([2.89],[0.0144],1,"n") | 2026/07/13 - LHO:91003 | 70 | |
| 2nd Modification | zpk([0.263],[2.89],1,"n") | zpk([2.89],[0.263],1,"n") | 2026/09/09 - LHO:91853 | 2026/07/28 - LLO:82137 | 4 |
Images attached to this report
