jeffrey.garcia@LIGO.ORG - posted 15:58, Thursday 12 January 2012 - last comment - 18:18, Tuesday 31 January 2012(2026)
H2 ITMY R0 transfer functions
A. Effler, J. Garcia Transfer function measurements on the H2 ITMY R0 top mass were completed last night with the results attached. Damping loops on the M0 mass was ON as well as for the FMY M1 stage. The BSC ISI was UNlocked for this measurement as well. Resonances for this measurement are more prominent than the previous night's, which were incomplete due to the watchdogs tripping in the morning work hours. Initial observations indicate the DC scaling calibration factor is still slightly lower than the model with the exception of the Longitudinal and Yaw DoFs. The second Longitudinal mode is about ~0.2Hz lower than the model. The first Yaw mode is slightly higher (~0.05Hz) than the model prediction. Comparisons of this measurement with previous data from the LVEA test stand and Staging Building are still to come.
Non-image files attached to this report
Comments related to this report
Attached are comparisons to the previous ITMY TFs (before chamber insertion). Not much has changed. Which is good.
Non-image files attached to this comment
The 'wire' model (for metal build, main chain) was mistakenly used for the reaction chain in the above plots. I attach new plots below with the proper model, made with the latest version of plotallquad_dtttfs.m. More importantly, I confirm AE and JG's assessment. Still looks good -- good enough to close up the chamber and see what we'll see!
Non-image files attached to this comment