jeffrey.kissel@LIGO.ORG - posted 13:02, Thursday 08 August 2024 - last comment - 18:08, Thursday 08 August 2024(79513)
SRM, ZM6, OFI, OMC, OM2, OM3 (Mostly) In-vac Health Check TFs -- all look great (SRM Taken with Alignment Offsets ON)
J. Kissel Took the opportunity to grab post-OFI-repair vent, in-vac transfer functions of the following HAM5 and HAM6 SUS. Of course, we're not at full observing-level vacuum, but most of the molecules are out of the chamber that would contribute to buoyancy, so the SUS are at the position they will be in observing-level vacuum. Executive summary: I'm happy with all SUS that I measured -- including the two that were "interesting" and or touched during this vent -- SRM and OFI. For the story about SRM, see LHO:79433. And of course, the OFI had had optics replaced. Several other SUS in HAM5 / 6 were not touched during the vent (aside from a few alignment sliders), so we didn't expect any degradation in performance and don't see any. These SUS are ready to resume observing gravitational waves! Processed results will be posted as comments below. Some relevant details of the status of the suspensions and their surroundings during the measurements. Environment Status (Same for HAM5 and HAM6) ISI DAMPED HPI OFFLINE and mechanically locked VAC Pressure at 1e-5 Torr Status of alignment offsets and coil driver switchable filter requested (CD) State. OPTIC ON/OFF Value (if on, [urad]) CD State SRM ON P/Y : +1663 / -3095 1, LP OFF ZM6 OFF (n/a) Fixed in 2, LP ON OFI OFF (n/a) Fixed in 2, LP ON OMC ON P/Y : +340.5 / 0.0 1, LP OFF OM2 ON P/Y : +716 / -1701 Fixed in 2, LP ON OM3 ON P/Y : -1147 / +20 Fixed in 2, LP ON File Names: SRM HSTS/H1/SRM/SAGM1/Data/2024-08-08_1823_H1SUSSRM_M1_WhiteNoise*.xml ZM6 HXDS/H1/ZM6/SAGM1/Data/2024-08-08_1828_H1SUSZM6_M1_WhiteNoise*.xml OFI OFIS/H1/OFI/SAGM1/Data/2024-08-08_1850_H1SUSOFI_M1_WhiteNoise*.xml OMC OMCS/H1/OMC/SAGM1/Data/2024-08-08_1900_H1SUSOMC_M1_WhiteNoise*.xml OM2 HXDS/H1/OM2/SAGM1/Data/2024-08-08_1920_H1SUSOM2_M1_WhiteNoise*.xml OM3 HTTS/H1/OM3/SAGM1/Data/2024-08-08_1935_H1SUSOM3_M1_WhiteNoise*.xml
SRM Results (regular, zoomed)
Found at $(sustrunk)/HSTS/Common/Data/allhstss_2024_08-08_H1SUSSRM_M1_PostOFIVentAirvVac_ALL*_TFs.pdf
ZM6 Results (regular, zoomed)
Found at $(sustrunk)/HXDS/Common/Data/allhxdss_2024-08-08_H1SUSZM6_InAirvVac_ALL*_TFs.pdf
OFI Results (regular, zoomed)
Found at $(sustrunk)/OFIS/Common/Data/allofiss_2024-08-08_H1SUSOFI_PreVentvPostInAirvInVac_ALL*_TFs.pdf
OMC Results (regular, zoomed)
Found at $(sustrunk)/OMCS/Common/Data/allomcss_2024-08-08_H1SUSOMC_PreVentvPost_ALL*_TFs.pdf
OM2 Results (regular, zoomed)
Found at $(sustrunk)/HXDS/Common/Data/allhxdss_2024-08-08_H1SUSOM2_Vac_ALL*_TFs.pdf
OM3 Results (regular, zoomed)
Found at $(sustrunk)/HTTS/Common/Data/allhttss_2024-08-08_OM3_H1SUSHTTS_PostVentInAirvVac_ALL*_TFs.pdf