In preparation for acceptance review of the ETMX quadruple suspension, I took a set of ASD of the osems in the local and euler basis. ETMX is in chamber, under vacuum and the ISI was in its level 1 isolated state (ST1 = T100mHz blend on X and Y, T750mHz for the other DOF, ST2 = 750mHz blend). Measurement was taken successively with suspension damping on and off.
The main resonnances of main and reaction chains are well damped for all degrees of freedom.
The minor things to notice are :
Damping for the vertical DOF of the reaction chain is not having much effect on the first resonnance (@~ 0.56Hz) (see p9 of 2nd pdf).
The upper left osem of L2 level has its noise floor above the usual sensor noise we see on other osems (see p34 of 3rd pdf).
Otherwise everything else looks good.
The results attached are :
1) Comparison damping off/on for the top mass sensors of the main chain
2) Same for the reaction chain
3) Comparison between different quads (H1 ETMX H1 ETMY L1 ITMY L1 ITMX) of all osem sensors in local and euler basis.
A safe snapshot will need to be taken when possible since I found the normV/R/P filters disengaged, and a gain of 10 in the L2L L1 sensalign matrix. I also corrected the channel list of the plotquadspectra.m since it was requesting two times the L1_WIT_L channels. The modified script was commited to the svn
EULER DOF H1:SUS−ETMX_L1_WIT_L_DQ (pg 29 of third attachment) also shows excess noise, which is due to the factor of 10 in the sensalign matrix (was corrected this week and snapshot was saved)