Reports until 11:37, Tuesday 08 August 2017
H1 SUS
jeffrey.kissel@LIGO.ORG - posted 11:37, Tuesday 08 August 2017 - last comment - 18:22, Thursday 24 August 2017(38077)
Single Stage SUSs Checked for Rubbing 
J. Kissel

I've checked the last suspensions for any sign of rubbing. Preliminary results look like "Nope." 

The data has been committed to SUS repo here:
/ligo/svncommon/SusSVN/sus/trunk/HAUX/H1/IM1/SAGM1/Data/
2017-08-08_1629_H1SUSIM1_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1629_H1SUSIM1_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1629_H1SUSIM1_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HAUX/H1/IM2/SAGM1/Data/
2017-08-08_1714_H1SUSIM2_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1714_H1SUSIM2_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1714_H1SUSIM2_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HAUX/H1/IM3/SAGM1/Data/
2017-08-08_1719_H1SUSIM3_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1719_H1SUSIM3_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1719_H1SUSIM3_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HAUX/H1/IM4/SAGM1/Data/
2017-08-08_1741_H1SUSIM4_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1741_H1SUSIM4_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1741_H1SUSIM4_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/OM1/SAGM1/Data/
2017-08-08_1544_H1SUSOM1_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1544_H1SUSOM1_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1544_H1SUSOM1_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/OM2/SAGM1/Data/
2017-08-08_1546_H1SUSOM2_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1546_H1SUSOM2_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1546_H1SUSOM2_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/OM3/SAGM1/Data/
2017-08-08_1625_H1SUSOM3_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1625_H1SUSOM3_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1625_H1SUSOM3_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM1/SAGM1/Data/
2017-08-08_1516_H1SUSRM1_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1516_H1SUSRM1_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1516_H1SUSRM1_M1_WhiteNoise_Y_0p01to50Hz.xml

/ligo/svncommon/SusSVN/sus/trunk/HTTS/H1/RM2/SAGM1/Data/
2017-08-08_1520_H1SUSRM2_M1_WhiteNoise_L_0p01to50Hz.xml
2017-08-08_1520_H1SUSRM2_M1_WhiteNoise_P_0p01to50Hz.xml
2017-08-08_1520_H1SUSRM2_M1_WhiteNoise_Y_0p01to50Hz.xml

Will post results in due time, but my measurement processing / analysis / aLOGging queue is severely backed up.
Comments related to this report
jeffrey.kissel@LIGO.ORG - 14:59, Thursday 17 August 2017 (38253)
Link 

J. Kissel

Process the IM1, IM2, and IM3 data from above. Unfortunately, it looks like I didn't actually save an IM4 Yaw transfer function, so I don't have plots for that suspension.

I can confirm that IM1, IM2, and IM3 do not look abnormal from their past measurements other than a scale factor gain. Recall that the IMs had their coil driver range reduced in Nov 2013 (see LHO aLOG 8758), but otherwise I can't explain the electronics gain drift, other than to suspect OSEM LED current decay, as has been seen to a much smaller degree in other larger suspension types.

Will try to get the last DOF of IM4 soon.
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 17:26, Thursday 17 August 2017 (38260)
Link 

All HTTSs are clear of rubbing. 

Attached are
- the individual measurements to show OSEM basis transfer function results,
- each suspensions transfer functions as a function of time
- all suspensions (plus an L1 RM) latest TFs just to show how they're all nicely the same (now)

Strangely, and positively, though RM2 has always shown an extra resonance in YAW (the last measurement was in 2014 after the HAM1 vent work described in LHO aLOG 9211), that extra resonance has now disappeared, and looks like every other HTTS. Weird, but at least a good weird!
Non-image files attached to this comment
jeffrey.kissel@LIGO.ORG - 18:22, Thursday 24 August 2017 (38355)
Link 

J. Kissel

Still playing catch up -- I was finally able to retake IM4 Y. Processed data is attached. Still confused about scale factors, but the SUS is definitely not rubbing, and its frequency dependence looks exactly as it did 3 years ago.
Non-image files attached to this comment