Reports until 15:57, Tuesday 27 May 2025
H1 SUS
oli.patane@LIGO.ORG - posted 15:57, Tuesday 27 May 2025 (84597)
RM1 and RM2 Damped transfer functions taken (again) with lower damping filter gain + comparison

Jeff, Oli

Jeff updated the damping filter gain for the RMs (84590), so I took health check transfer functions with damping loops on again (84586) and made a comparison with them vs the previous measurements.

RM1:

Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/SAGM1/Data/2025-05-27_2030_H1SUSRM1_M1_WhiteNoise_{L,P,Y}_0p01to50Hz.xml, r12340

Comparison: /ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2022_vs_2025_DampingOn_wGainChange_H1SUSRM1_ALL_TFs.pdf*, r12342

RM2:

Data: /ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/SAGM1/Data/2025-05-27_2045_H1SUSRM2_M1_WhiteNoise_{L,P,Y}_0p01to50Hz.xml, r12339

Comparison: /ligo/svncommon/SusSVN/sus/trunk/HTTS/Common/Data/allhttss_2022_vs_2025_DampingOn_wGainChange_H1SUSRM2_ALL_TFs.pdf*, r12342

These latest measurements are showing less gain peaking in Pitch, and almost none in Yaw. There is still gain peaking in Length, but it does look like it's a bit less than the measurements from earlier today.

* The phases for the latest (2025-05-27) measurements have been shifted by 180degrees.

Non-image files attached to this report