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Reports until 17:14, Thursday 12 January 2023
H1 TCS (ISC)
camilla.compton@LIGO.ORG - posted 17:14, Thursday 12 January 2023 - last comment - 13:18, Friday 13 January 2023(66781)
CO2 stepper after ITMX YAW beam spot change scheduled for tonight at 7pm

Georgia, Camilla

After CO2 stepper tests in alog 66732 and 66755.  Tonight we will change ITMX YAW y2L and then run CO2 stepper, up in CO2X, down in CO2Y. If IFO in NLN, if we loose lock, ISC_LOCK DOWN will reset everything.

7pm -7:30 pm 7:00pm-12:00am  Gradually change ITMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN from 1.7 to 2.1 1.9 and leave it at 2.1 for remainder of lock. ligo/gitcommon/labutils/beam_spot_raster/a2l_gain_stepper.py.

8pm - 12am 7:30pm-11:30am Adjust CO2 settings to higher X, lower Y. So CO2X from 2.2 to 2.8W, CO2Y from 1.1 to 0.5W. /userapps/release/tcs/common/scripts/power_adj_scripts/co2_power_stepper.py

'ITMX =  [2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.8, 2.7, 2.6, 2.5, 2.4, 2.3, 2.2]
'ITMY' = [1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1]

step_timer = 1200

Comments related to this report
camilla.compton@LIGO.ORG - 08:44, Friday 13 January 2023 (66789)ISC

Attached is plot from last nights test. The ITMX_L2_DRIVEALIGN_Y2L_SPOT_GAIN change from 1.7 to 2.1 seems to have improved arm powers by 1kW each. RF18 increased by ~4%, but RF90 also increased by 2%. PR_GAIN increases slightly. Unsure if the CO2 power changes are better or worse.

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camilla.compton@LIGO.ORG - 13:18, Friday 13 January 2023 (66795)

AWG_LINES injected during test are attached.

201Hz frequency line increases during to change in CO2 powers AND change in ITMX_Y2L. Other lines aren't effected much.

  • awgs['intensity_47.3Hz_222Hz_4222Hz']
  • awgs['frequency_25.2Hz_201Hz_4500Hz']
  • awgs['prcl_35.3Hz']; awgs['srcl_38.1Hz']; awgs['mich_40.7Hz']  

Using Dan Browns's code: python /ligo/gitcommon/labutils/demod_lines/demod_lines.py --channel H1:OMC-DCPD_SUM_OUT_DQ -f 25.2 35.3 38.1 40.7 47.3 201 222 4222 4500 --t0 1357609918  --t1 1357645194 --server=h1nds1 --port=8088  and plotting code from Dan in camilla.compton/Documents/tcs/scripts/demod_data/DBexample_plot_OMC_DCPD_demod.py

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