aLIGO LHO Logbook

H1 TCS

georgia.mansell@LIGO.ORG - posted 17:58, Tuesday 17 January 2023 - last comment - 15:49, Thursday 19 January 2023(66853)

CO2 test tonight

I've set up a CO2 power stepper to run tonight, if the IFO is at NLN. The test starts at 9pm and will:

Step the CO2 X power down (to compensate for the ring heater added this weekend)
Sit with CO2 X at 1W for 1 hour
Step the CO2Y power up, then down, with pauses in between

The total script should take 10 hours to run (done at 7am) and is running on ZOTWS24 (in the CUR).

The code is in:

/opt/rtcds/userapps/trunk/tcs/common/scripts/power_adj_scripts/co2_power_stepper.py

I've got the script running in 2 tabs, one for ITMY and one for ITMX.

Comments related to this report

georgia.mansell@LIGO.ORG - 17:56, Wednesday 18 January 2023 (66874)

Set up this test to try to run again at 9pm tonight on zotws19

daniel.brown@LIGO.ORG - 15:05, Thursday 19 January 2023 (66896)

Demodulated frequency injection lines during this CO2 test attached

Non-image files attached to this comment

georgia.mansell@LIGO.ORG - 15:49, Thursday 19 January 2023 (66898)

Here are the buildups during this CO2 test. With

Lower CO2X, nominal CO2Y: increased circulating power in the Y arm, slight increase in REFL_LF, increase in POP18 to a point, looks like we went over a peak
Lower CO2X, high CO2Y: further increase in Y arm circulating power, decrease in kappa_C, and F_C, decrease in REFL, decrease in POP18, increase in POP9
Lower CO2X, lower CO2Y: Decrease in PR gain, arm circulating powers, good for POP18 and POP90, REFL increase

Images attached to this comment