Reports until 01:01, Thursday 13 April 2023
H1 TCS
daniel.brown@LIGO.ORG - posted 01:01, Thursday 13 April 2023 - last comment - 17:39, Thursday 13 April 2023(68643)
Comm+diff CO2 tests

Starting common and differential CO2 step from a script on ZOTWS21 should be done in 6 hours

Comments related to this report
daniel.brown@LIGO.ORG - 12:36, Thursday 13 April 2023 (68648)

Still processing the line demodulations but certain diferential CO2 seem to hurt both the PRCL gain and what seems to be a squeeze rotation

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daniel.brown@LIGO.ORG - 17:39, Thursday 13 April 2023 (68663)

Unforunately the frequency noise cable got unplugged, so the lines did not come on. As it's clearly visible at high frequency I just plot the spectrum changes. Less CO2 seems to help here at this thermal state.

We're not seeing as large a jitter suppression as seen previously. The only point that does reduce it all across the frequency range is also the point which reduces the PRCL gain and rotates the squeezing, so not ideal.

LSC to LSC couplings look better after changing the input matrices.

LSC-CHARDY couplings seem worse with less common CO2

LSC-CHARDP couplings seem better with less common CO2

Overall there's one obviously bad setting to run the annular CO2s, no option is clearly better than where we are currently.

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