camilla.compton@LIGO.ORG - posted 07:29, Tuesday 02 April 2024 - last comment - 14:09, Tuesday 09 April 2024(76867)
Paused TCS_ITM_CO2_PWR guardians to keep CO2's on for 1 hour after lockloss
Paused TCS_ITM_CO2_PWR guardians so that when the IFO unlocks the CO2s will stay on so we can take absorption measurements of the ITMs using HWS (need ITMs and SR2 to stay aligned for 1 hour after lockloss).
Comments related to this report
camilla.compton@LIGO.ORG - 09:03, Tuesday 02 April 2024 (76871)
Using Dan's /ligo/gitcommon/labutils/hws_absorption_fit/april2024/fit_absprtion_v2.py with lockloss time 1396105132, edited P_y and P_x values to adjust the fit and old and new origin values (ours are correct, checked in 76385).
This is an interesting data set as you can see when the CO2's were turned back to 0W after an hour, ndscope attached.
The IFO had only been at full power for ~1hour, this might explain the lower values than previously measured. Plot of fits attached. Fit of ITMY isn't very good. We could try using Cao's clean spherical power channels (single pass) or his 66155 fitting code. LLO also uses a different method LLO69930.
Un-paused at 16:01UTC, CO2s are back to 0W output.
Last done in 71400.
Using Dan's /ligo/gitcommon/labutils/hws_absorption_fit/april2024/fit_absprtion_v2.py with lockloss time 1396105132, edited P_y and P_x values to adjust the fit and old and new origin values (ours are correct, checked in 76385).
This is an interesting data set as you can see when the CO2's were turned back to 0W after an hour, ndscope attached.
The IFO had only been at full power for ~1hour, this might explain the lower values than previously measured. Plot of fits attached. Fit of ITMY isn't very good. We could try using Cao's clean spherical power channels (single pass) or his 66155 fitting code. LLO also uses a different method LLO69930.
ITMX: 155mW absorbed = 430ppb (155mW / 361kW)
ITMY: 120mW absorbed = 330ppb (120mW / 361kW)