Naoki Vicky Daniel
We measured and adjusted the ugf of the CLF and OPO ISS servos. Both were set to ~10kHz. The CLF cannot run with the 2kHz/10kHz boost, since the phase decays significantly faster.
Plot 1: open loop TF (solid line CLF, dashed OPO)
Plot 2: Noise at OUT1 (top OPO, bottom CLF)
With these settings none of the error readbacks are saturated.
The CTRL signal DAQ readbacks for OPO + CLF ISS look great after today's chassis replacements, LHO:69232. SQZ-{OPO,CLF}_ISS_CTRL_OUTPUT's match the slow readbacks well. And, at our current ISS settings (see screenshot), DAQ readbacks of the error signal (SQZ-{OPO,CLF}_ISS_ERRORMON) are not saturated. OPO/CLF ISS settings have been updated in their respective guardians. OPO_TRANS_DC now uses all 3 whitening stages (up from 2).
DTT ISS in-loop noise template saved in $(userapps)/sqz/h1/Templates/dtt/SQZ_ISS_inloop_noises.xml . If we change OPO_TRANS power (to change gen sqz level), or change CLF power, we can run this template to ensure ISS works as expected.
Error point spectra
