Reports until 12:30, Tuesday 26 March 2024
H1 SUS (SUS)
rahul.kumar@LIGO.ORG - posted 12:30, Tuesday 26 March 2024 - last comment - 17:17, Thursday 28 March 2024(76714)
OPLEV charge measurements - ETMX and ETMY

This morning I took the OPLEV charge measurements on both ETMX and ETMY suspensions. I will post the results below after processing the data.

Both the suspensions were restored to their nominal state after the measurements were complete.

Later, Jeff flipped the sign on ETMX ESD bias voltage once the above measurements were done.

Comments related to this report
jeffrey.kissel@LIGO.ORG - 13:56, Tuesday 26 March 2024 (76718)ISC
Link 

H1 SUS ETMX L3 ESD Bias was held at +430 [V_ESD] in order to mitigate the charge build up identified in LHO:76326 for ~1 hr today, 2024-03-26, between 17:46 and 18:46 UTC.

Attached is a trend of the ESD bias offset (calibrated in [V_DAC] rather that [V_ESD]) throughout today's maintenance.
Images attached to this comment
ryan.crouch@LIGO.ORG - 17:17, Thursday 28 March 2024 (76780)SUS
Link

I processed the measurement, ETMYs charge appears low and doesn't have any major trends, ETMXs charge is around 40 [V] on most DOFs and appears to have a slight upward trend.

Images attached to this comment