jeffrey.bartlett@LIGO.ORG - posted 14:52, Tuesday 24 December 2013 - last comment - 09:08, Monday 06 January 2014(9081)
H1-SR2 Phase 2b Transfer Functions
Andres R. & Jeff B. We suspended H1-SR2 with the metal dummy mass installed. Checked several of the critical measurements to make sure nothing was disturbed during the transport of the suspension to the LVEA. All measurements are within specifications. We centered the BOSEMs and took a set of transfer functions for phase 1b testing. The TF plots are attached below. There is some noise below 1Hz. However, as we are going to swap out the bottom wires, the M3 mass, and rework the suspension anyway, spending much time tracking down and fixing this noise is not a high priority.
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Comments related to this report
To clarify, the undamped TF plots presented above (allhstss_2013-12-23_Phase2a_H1HSTS_M1_ALL_ZOOMED_TFs.pdf) for H1 SR2 TFs (cyan trace) have been taken chamber-side at Phase 2a (i.e. with the metal dummy mass), and have been compared with L1 SR2 at Phase 2a (orange trace) and L1 SR2 Phase 2b (magenta trace). However, a couple of the pitch modes appear lower for H1 SR2 than for L1 SR2 and the model. To provide a better comparison against a whole plethora of other HSTS TFs I've generated the plot below (allhstss_2014-01-06_Phase2a_H1SR2_M1_Damp_ALL_ZOOMED_TFs.pdf), noting that all these other traces were obtained during Phase 2a of testing. It can be seen that the H1 SR2 pitch modes are at the extremes, but *just* appear look to fall within the acceptable spread of measurements.
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