Displaying report 1-1 of 1.
Reports until 18:20, Wednesday 03 August 2011
X1 SUS
betsy.weaver@LIGO.ORG - posted 18:20, Wednesday 03 August 2011 (1155)
ITMy work
Betsy, Travis, Rob

There appeared to still be some mismatch of one of the peaks in the reaction chain transfer functions, which was believed to be from a blade tip at the wrong height.  Today, I found that indeed both top mass blades were on the order of 1mm out - 1 up, 1 down.  After a rigorous round of readjusting those which involved removing the top of the table cloth and BOSEMs, I induced a pitch.  Another round of tip adjustment ensued, followed by coarse pitch adjustment via the mechanics on the underside of the top mass.  Once hanging normal again, I found that the side BOSEM would not mate to the mass flag which was now hanging quite low.  To fix this, I had to reset the table cloth position in the upper structure to lower the BOSEM mating location to match the position of the mass flag.  After another round of diagonalization of both R0 and M0 BOSEMs, Rob is back to taking TFs.  There is still a bit of differential roll observed by eye between the R0 UIM and Top Mass, but we'll see what the data looks like.  I hope these will reveal a healthy R0 such that I can get on with lacing the lower cables by the end of the week.
Displaying report 1-1 of 1.