jeffrey.kissel@LIGO.ORG - posted 14:00, Thursday 23 May 2024 - last comment - 15:33, Thursday 23 May 2024(78008)
Calibration Line Heights Increased in the face of Elevated Low Frequency Noise post PR3 Move
J. Kissel, T. Shaffer, J. Driggers Joe Betz and Jenne Driggers spoke of increasing the calibration line heights that drive the ETMX actuation stages in the face of the elevated noise in the detector in the 10-20 Hz frequency region (LHO:77993). TJ caught me, pointed this out to me, so I've staged this change by editing - /opt/rtcds/userapps/release/isc/h1/guardian/lscparams.py (rev 27751 lines 481 - 484) here, I increased the gains on the calibration line oscillators STAGE FROM TO FACTOR OF UIM / L1 6.6 15.0 ~2x PUM / L2 1.7 8.0 ~4x TST / L3 0.061 0.1 ~2x - /opt/rtcds/userapps/release/isc/h1/guardian/ISC_LOCK.py (rev 27729, lots of lines, where "CAL_LINE" appears in several states) here, as indicated in Louis' aLOGs where he's changed the line heights (e.g. LHO:71947), one *also* needs to change the correspond gains in the front-end calibration pipeline's demodulation of the lines. So I've added the following lines to the existing for loop that changes these gains for g in ['CLK','SIN','COS']: ezca['CAL-CS_TDEP_SUS_LINE1_COMPARISON_OSC_%sGAIN'%(g)] = (value) ezca['CAL-CS_TDEP_SUS_LINE2_COMPARISON_OSC_%sGAIN'%(g)] = (value) ezca['CAL-CS_TDEP_SUS_LINE3_COMPARISON_OSC_%sGAIN'%(g)] = (value) Will load at our earliest convenience.
Guardian code loaded, and I've also committed the changes to the userapps svn: /opt/rtcds/userapps/release/isc/h1/guardian$ svn commit -m "Adjusted calibration line height gains. See LHO:78008." lscparams.py Sending lscparams.py Transmitting file data .done Committing transaction... Committed revision 27753. /opt/rtcds/userapps/release/isc/h1/guardian$ svn commit -m "Added calibration line comparison oscillator gains as a thing to get set as well when calibration lines are turned on and off in various states." ISC_LOCK.py Sending ISC_LOCK.py Transmitting file data .done Committing transaction... Committed revision 27754. /opt/rtcds/userapps/release/isc/h1/guardian$ OPSINFO :: As of this entry, the guardian states which set these gains have not yet run, so the new gain settings will need to be accepted in SDF before we can go to observe again.