[Stuart A, Jeff B, Mark B, Jeff G]

Initial M1-M1 damped and un-damped transfer functions have already been taken for the PR3 (HLTS), see LHO aLOG entry 2649. Recently, magnets and AOSEMs have also been added to the lower stages (M2 and M3) to complete the full metal suspension, see LHO aLOG entry 2953.

As part of Phase 1b testing, these transfer functions can be compared with the model as well as TFs obtained from LLO's PR3 Phase 1b results. Also, since BOSEM and AOSEM sensors are available at all stages, power spectra can now be be taken.

Pre-flight checks have been carried out:-
- Confirmed watchdogs are configured to within accepted limits (see LHO aLog entry 2576).
- Confirmed M1 BOSEM INPUT FILTERS, gains and offsets (as per LHO aLog entry 2645).
- Configured M2 and M3 AOSEM INPUT FILTERS, gains and offsets:-

M2-UL s/n = 448, open-light = 18318.0, off-set =  -9159.0, gain = 1.638 
M2-LL s/n = 601, open-light = 20793.0, off-set = -10396.5, gain = 1.443 
M2-UR s/n = 336, open-light = 19426.0, off-set =  -9713.0, gain = 1.544
M2-LR s/n = 413, open-light = 18210.0, off-set =  -9105.0, gain = 1.647  

M3-UL s/n = 489, open-light = 17727.0, off-set =  -8863.5, gain = 1.692 
M3-LL s/n = 269, open-light = 23463.0, off-set = -11731.5, gain = 1.279
M3-UR s/n = 461, open-light = 25154.0, off-set = -12577.0, gain = 1.193
M3-LR s/n = 287, open-light = 17820.0, off-set =  -8910.0, gain = 1.684

- Configured COIL OUTPUT filter gains and signs, as specified in T1200015-v1. However, the sign has to be switched from - to + for the "side" BOSEM, since it has been relocated to the opposite side of the structure (as requested by SYS).

Firstly, I conducted some quick low-res M1-M1 TF's on all dofs in DTT (not recorded), just to confirm that no earthquake stops, blade stops or OSEM flags were rubbing since the last TF's were taken. The TFs obtained for Phase 1b testing of PR3 have now been compared with those obtained at previous phases of testing (allhltss_2012_06_07_AllHLTS_ALL_ZOOMED_TFs.pdf). 

Plot Key:-
Blue trace = Model
Orange trace = LLO PR3 Phase 1b at test-stand with damping OFF
Black trace = LHO PR3 Phase 1b at test-stand with damping OFF
Pink trace = LHO PR3 Phase 1b at test-stand with damping ON

Prior to taking power spectra data, it was necessary to enable the following DQ channels, so that data could later be extracted from the frames:-

X1:SUS-HXTS_M2_OSEMINF_LL_OUT_DQ
X1:SUS-HXTS_M2_OSEMINF_LR_OUT_DQ
X1:SUS-HXTS_M2_OSEMINF_UL_OUT_DQ
X1:SUS-HXTS_M2_OSEMINF_UR_OUT_DQ

X1:SUS-HXTS_M2_WIT_L_DQ
X1:SUS-HXTS_M2_WIT_P_DQ
X1:SUS-HXTS_M2_WIT_Y_DQ

X1:SUS-HXTS_M3_OSEMINF_LL_OUT_DQ
X1:SUS-HXTS_M3_OSEMINF_LR_OUT_DQ
X1:SUS-HXTS_M3_OSEMINF_UL_OUT_DQ
X1:SUS-HXTS_M3_OSEMINF_UR_OUT_DQ     

X1:SUS-HXTS_M3_OSEMWIT_L_DQ
X1:SUS-HXTS_M3_OSEMWIT_P_DQ
X1:SUS-HXTS_M3_OSEMWIT_Y_DQ

To ensure the above channels were available it was necessary to restart the framebuilder. 

Power spectra have been taken (using the Matlab script "plothlts_spectra.m") with damping loops both ON and OFF for each stage (2012-06-08_1800_X1SUSPR3_M*_ALL_Spectra.pdf)

Power spectra data, again with both damping ON and OFF have been taken, which compare X1 PR3 (at LHO) and X2 PR3 (at LLO) on the triple test-stands (allhltss_2012-06-08_ALL_Spectra_Don.pdf and allhltss_2012-06-08_ALL_Spectra_Doff.pdf).  

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 (allhltss_2012-06-08_X1SUSPR3_M1M2M3_Spectra_ALL_Don.pdf).

A BURT snapshot has been taken of the latest PR3 functioning environment "20120606_x1sushxts_PR3.snap" and stored in the following directory:-
"/opt/rtcds3/tst/x1/cds_user_apps/trunk/sus/x1/burtfiles".

All data, plots and scripts have been committed to the SUS svn as of this entry.

This should now be sufficient to complete Phase 1b testing of the PR3 suspension.

Finally, thanks also to Jim Batch for being able to restart the trippleteststand when I was unable to log-in remotely earlier today.