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Reports until 17:01, Wednesday 06 November 2013
H1 SUS
arnaud.pele@LIGO.ORG - posted 17:01, Wednesday 06 November 2013 - last comment - 17:16, Tuesday 15 April 2014(8409)
PRM TF round 2

Last friday, Betsy and Travis added weight to the middle mass of SRM currently on the test stand, in order to center the flags with the osems cf alog 8367. A first round of TF have been taken before that, showing clean measurements. A new set have been taken monday night to assess that there's no major change. The new results are showing an excellent match with the previous ones
 

Results in attachments are described below :

(1) H1 SUS SRM M1-M1 (top mass) comparison between modeled and measured undamped transfer functions for the 6 dofs

(2) H1 SUS SRM M1-M1 comparison between modeled and measured damped transfer function for the 6 dofs

(3) H1 SUS SRM M1-M1 undamped TF comparison before and after adding weight to the middle mass

data have been commited under the svn

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Comments related to this report
arnaud.pele@LIGO.ORG - 08:47, Friday 08 November 2013 (8436)

I meant SRM in the title

arnaud.pele@LIGO.ORG - 17:16, Tuesday 15 April 2014 (11369)

For acceptance review I also added the spectra of SRM during phase 2b (currently plugged on the test bench).
The first 3 pdfs are showing the effect of the top mass damping on each stage. The last two pdfs are comparing SRM spectra with other hsts suspensions (PRM and SR2) during phase 2b, damping off and damping on.
Everything looks good for all osem signals, damping is working fine by significantly reducing the Qs of the resonances, and both damping on and off spectra are similar to other HSTSs at the same 2b stage of testing.

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