Reports until 20:08, Friday 11 February 2022
H1 PSL (PSL)
craig.cahillane@LIGO.ORG - posted 20:08, Friday 11 February 2022 - last comment - 15:33, Monday 14 February 2022(61721)
Measured ISS second loop OLG 
First measurement of ISS second loop olg since PSL reinstall.  UGF is 1 kHz.  Phase margin is 45 degs.

Notes: 
- only engaged Boost 1 for the measurement, Boost 2 seemed to make the diffracted power much more noisy.
- ISS VGA gain is was 0 dB
- readbacks for PDs are wrong

Data from measurement stored in https://git.ligo.org/aligo_commissioning/psl_measurements
Made a template for this measurement in this directory at code/iss_second_loop_olg_SR785_template.yml
To use it, activate the psl conda env and run python SRmeasure.py iss_second_loop_olg_SR785_template.yml
Images attached to this report
Non-image files attached to this report
iss_second_loop_olg_11-02-2022_180511.pdf
Comments related to this report
craig.cahillane@LIGO.ORG - 15:33, Monday 14 February 2022 (61735)PSL
Link 

Craig, Austin, Elenna

Tried to turn on the second boost, failed to get a stable loop with this boost engaged.

We managed to get performance similar to what Keita measured in 2021 (alog 58850) by cranking the H1:PSL-ISS_SECONDLOOP_GAIN from 0 to 30 dB.

UGF = 25.6 kHz
phase margin = 30 degs

Measurement in 
https://git.ligo.org/aligo_commissioning/psl_measurements
at 
data/iss_second_loop_olg/iss_second_loop_olg_30_dB_second_loop_gain_slider_14-02-2022_125404.txt
Non-image files attached to this comment