Reports until 16:30, Tuesday 10 January 2023
H1 TCS (OpsInfo)
camilla.compton@LIGO.ORG - posted 16:30, Tuesday 10 January 2023 - last comment - 22:08, Wednesday 18 January 2023(66732)
CO2 stepper tests tonight from 8pm - 9am.

Another attempt of last night's alog 66713 TCS stepper test, this time with 3 different sets of powers and 3 start times. After recalibration alog 66724, nominal is now CO2X: 2.2W, CO2Y: 1.1W. Will start if IFO in NLN.

8pm - 10:40pm Common changes down in power

'ITMX' = [2.0, 1.8, 1.6, 1.4, 1.2, 1.0, 0.8]
'ITMY' = [0.9, 0.7, 0.5, 0.3, 0.1, 0.0]

12am - 4am Differential changes, X up, Y down

'ITMX' = [2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, 3.1, 3.2, 3.3]*
'ITMY' = [1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.0]*

5am - 9am Differential changes, Y up, X down

'ITMX' = [2.1, 2.0, 1.9, 1.8, 1.7, 1.6, 1.5, 1.4, 1.3]*
'ITMY' =  [1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0]*
 
*but will check current CO2s and gradually go up to 2.3 and 1.0W if we are at CO2 powers of previous test.
Comments related to this report
camilla.compton@LIGO.ORG - 12:34, Wednesday 11 January 2023 (66749)
Link

All tests ran last night. IFO locked at 8pm and tests started at 9pm. ndscope templates saved at /opt/rtcds/userapps/trunk/tcs/h1/templates/ndscope/TCS_stepper.yaml and TCS_stepper_xL.yaml

We didn't do the last data point as it was taking the IFO to a bad place. I started reverting the CO2 changes from 8.45 so they were back to nominal by 10am.

Attached are plots of all tests. All tests effected ADS_YAW3 (PRM) Each step was separated by 20 minutes.

A.  Common changes down in power - PLOT - Negative change. RF18 drops. The IFO wasn't completely thermalized during first set of tests, IFO got to NLN 1 hour before starting.

B.  Differential changes, X up, Y down - PLOT - Negative change. RF18 Kappa_C drop. Circulating arm powers drop especially after CO2X PWRMTR power > 5W while CO2Y < 0.5W

C.  Differential changes, Y up, X down - PLOT - Negative change. Large alignment changes after CO2X<3.5W, CO2Y>2.2W when. RF18 goes down and RF90 up. T-marker is at nominal CO2 powers

Future improvement, wait more time between tests as it's hard to understand what effects are caused by what changes.

Images attached to this comment
daniel.brown@LIGO.ORG - 17:13, Wednesday 11 January 2023 (66758)
Link

Plot attached of the demodulated (in H1:OMC-DCPD_SUM_OUT_DQ) frequency line injections as the CO2's were changed. Seems to only be affecting the 100-400Hz coupling.

Non-image files attached to this comment
daniel.brown@LIGO.ORG - 22:08, Wednesday 18 January 2023 (66878)
Link

Unfortunately I used a Conda environment which had a very old version of Scipy installed which has some bugs with filters. Attached is the fixed version of the plot. Line changes have been plotted in fractional change relative to the starting point now instead.

Non-image files attached to this comment