jeffrey.bartlett@LIGO.ORG - posted 16:35, Monday 16 July 2012 - last comment - 08:48, Friday 20 July 2012(3455)
Phase 1b testing of HSTS MC1
Andres R, Betsy B, and Jeff B took the transfer function for Phase 1b testing of the HSTS MC1 suspension. This data has been plotted and is ready for review.
Non-image files attached to this report
Comments related to this report
To assist with reviewing the MC1 (HSTS) suspension, please find attached below a plot showing a comparison of all HSTS suspensions measured at LHO and LLO, to date (allhstss_2012-07-16_AllHsts_ALL_ZOOMED_TFs.pdf). Note that, these M1-M1 transfer functions were all obtained at Phase 1b of testing. Power spectra have been taken with damping loops both ON and OFF for each stage (2012-07-17_1300_X1SUSMC1_M*_ALL_Spectra.pdf). Power spectra plots, with both damping ON and OFF have been produced, which compare all LHO HSTS measurements for PR2, MC1 and MC2 (allhstss_2012-07-17_ALL_Spectra_Don.pdf and allhstss_2012-07-17_ALL_Spectra_Doff.pdf). Note that, the comparison power spectra provided for MC2 M3 AOSEMs, show an elevated noise floor at high frequencies above 100 Hz. A similar issues has also been observed for suspensions attached to the LLO triple test-stand, which was rectified by going chamber-side. In addition, power spectra for specific degrees of freedom (L, P and Y) can be more conveniently compared across multiple stages (M1, M2 and M3) of the same suspension in the final plots found below (allhstss_2012-07-17_X1SUSMC1_M1M2M3_Spectra_ALL_Don.pdf). All data, results, and scripts I have committed to the sus SVN as of this entry. This ensures all measurements have been taken required to complete Phase 1b testing.
Non-image files attached to this comment
For further reference, I have added power spectra plots comparing LHO MC1, with the LLO MC3 suspension. Results from all three phases for the MC3 suspension are shown as follows:- Blue trace = LLO MC3 Phase 1b (X2SUSMC3 2012−05−01_1600) Green trace = LLO MC3 Phase 2b (L1SUSMC3 2012−06−28_1600) Red trace = LLO MC3 Phase 3a (L1SUSMC3 2012−07−02_1400) Cyan trace = LHO MC1 Phase 1b (X1SUSMC1 2012−07−17_1300)
Non-image files attached to this comment