jeffrey.garcia@LIGO.ORG - posted 16:07, Friday 17 February 2012 - last comment - 18:36, Friday 17 February 2012(2263)
H2 SUS ITMY M0 & R0 TFs
H2 SUS ITMY Open loop transfer function measurements were run on the H2 ITMY M0 & R0 top masses last night. The ISI damping loops were closed for the beginning of the measurements. There was a concern as to whether there was rubbing on the earthquake stops for ITMY after evidence of such on FMY earlier this week. These measurements show no preliminary signs of rubbing on the ITMY M0 & R0 masses and agree quite well with the models. Data: ~/SusSVN/sus/trunk/QUAD/H2/ITMY/SAGM0/Data/2012-02-16_1013494514_H2SUSITMY_M0_0p01to50Hz_AllDOFs_tf.mat ~/SusSVN/sus/trunk/QUAD/H2/ITMY/SAGR0/Data/2012-02-17-1013510837_H2SUSITMY_R0_0p01to50Hz_AllDOFs_tf.mat PDF Plots: ~/SusSVN/sus/trunk/QUAD/H2/ITMY/SAGM0/Results/2012-02-16_H2SUSITMY_M0_ALL_TFs.pdf ~/SusSVN/sus/trunk/QUAD/H2/ITMY/SAGR0/Results/2012-02-17_H2SUSITMY_R0_ALL_TFs.pdf
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The attached PDF is of the latest ITMY M0 & R0 TFs from the night of 2012-02-16 to the following morning compared with previous measurements of H2 SUS ITMY. The pdf has each of the M0 & R0 DoFs plotted with only previous H2 SUS ITMY measurements. Each measurement used the same drive parameters. Orange - 2011-11-29 - Monolithic Measurement on LVEA Test Stand, ISI locked. Black - 2011-12-02 - Floating ISI, Vibration Absorbers ON, L1 & L2 aligned Magenta - 2012-01-10 - In Chamber BSC8, ISI locked for M0 measurement, ISI UNlocked for R0 meas., No Damping Cyan - 2012-02-17 - In BSC8, ISI Floating, ISI Damping ON, chamber pump had begun but not completed due to leak There appears to be obvious indication for rubbing effects on the M0 & R0 top masses. Every DoF for both masses agree well with the model and are consistent with previous results. PDFs of Plots: ~/SusSVN/sus/trunk/QUAD/Common/Data/allquads_120217_H2SUSITMY_ALL_TFs.pdf
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