Reports until 12:22, Friday 31 July 2026
H1 SUS (SUS)
ryan.crouch@LIGO.ORG - posted 12:22, Friday 31 July 2026 (91350)
OPLEV charge measurement, ETMX & ETMY

I ran the charge measurements for both ETMs this morning. Unfortunately a medium (5.2 from Mexico) earthquake rumbled through from 16:38 to 16:58 UTC, but it didn't seem to effect the errors and coherences noticeably enough for me to restart the measurement.

For ETMX:

I was consistently getting low coherence for LL in Yaw, the charge appears to have plateaued or seen small increases (the error bars from the last measurement overlap with this one on all DOF/quadrants) on most DOFs/quadrants. The charge is above +\-50[V] on UR_P and LR_P, LR is still slowly trending to zero. ETMX is also quite misaligned as seen by its OPLEV.

For ETMY:

I was also seeing the worst coherence and largest errors on LL, both P and Y. The charge appears stable, there's not much difference from this measurement to the second to last (most recent one has large errors so it's not as valuable of a comparison). The charge is above +\-50[V] on LL P and Y, and UL_Y, there were some small increase of charge on LL as well.

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