Reports until 16:35, Monday 23 July 2012
H1 SEI
hugh.radkins@LIGO.ORG - posted 16:35, Monday 23 July 2012 (3547)
WHAM3 SEI/HEPI Status Update--Actuators/Initial Alignment
I really messed up but at least I remembered!  For the past couple weeks as we've been doing initial alignment and Actuator connection, I failed to correct the elevation numbers in HAM3 for the Xarm slope.  Oh boy...In case you care to know---The LIGO coordinate frame is not co-planar with the gravity field in most places and in fact there is a 2.4mm shift between them moving from BSC2 (where we set them equal) just to HAM3.  This shift is what I forgot to include in my elevation calcs when positioning HAM3 ISI Optical Table.
So today we disconnected and relocked the eight HEPI Actuators and cranked the HEPI DSCW Springs to pull the platform up to position.  Jason (IAS) was called in ~1400 and he gave us a bit of horizontal correction.  Tomorrow we'll reconnect the Actuators and ask for another IAS shot to put this back to bed.
At least we are getting better at Actuator connecting!

Thanks to Eric, Mitchell and Jason.