Reports until 14:30, Monday 08 August 2011
H2 SUS
jeffrey.kissel@LIGO.ORG - posted 14:30, Monday 08 August 2011 (1171)
H2SUSITMY Progress
B. Bland, R. Lane, J. Kissel, (B. Shapiro)

The chronology up to today (starting last Monday, 8/1) is:
2011-08-01 Rob measures R0 transfer functions which indicate second pitch mode is low, pointing toward blade spring tip heights being off from nominal

2011-08-02 Blade spring tips are adjusted, which require removal of entire top table cloth on BOTH M0 and R0 Chains

2011-08-03 Blade tips are adjusred, OSEMs are re-installed, and re-diagonalized

2011-08-04 
    - Rob re-measures R0 transfer functions, and finds pitch dynamics have not changed much, and now transverse transfer function looks like garbage.
    - LHO Sitewide Power Outage

2011-08-05 
    - Betsy plays with suspension, looks at range of motion, locking M0 and R0 penultimate stage
    - QUAD computer is brought back up, but epics values not restored

2011-08-08 
    - Jeff and Brett suggest that, since TOP to TOP diagonal transfer functions are so clean (other than transverse), perhaps SD OSEM is busted, or watchdog tripped during measurement, etc. etc.
    - Jeff restores epics values using
     /ligo/svncommon/SusSVN/sus/trunk/QUAD/H2/ITMY/Common/MatlabTools/Prepare_ITMY_20110729.m
     This script did not include the test enable binary I/O switches, which prevent drive signals from exiting the coil driver chassis. These were restored with the following:
caput H2:SUS-ITMY_TEST_BOUT_0_L32A 0xaaaa
caput H2:SUS-ITMY_TEST_BOUT_0_L32A 0xaa
     - Jeff attempts to reproduce Rob's Transverse TOP to TOP diagonal TF on R0, gets no coherence, as with Robs measurement on 2011-08-04.
     - Betsy discovers she's left the PUM stages earthquake stops slightly engaged, and removes them
     - Quick measurement of Transverse reveals medium success
     - We're reminded that the R0 chain has differential roll between TOP and UIM stage, which necessitates lowering/rotating the SD OSEM to a "clocked" position, but because of the OSEM mounting plate's motion is restricted by a pin, (see pictures attached)
     - Betsy also discovers inter-chain PUM earthquake stops have been rubbing, removes the interference BUT now notices a total pitch in the main chain. This is supported by excessively large signals signals on F1 F2 and F3 OSEMs
     - With fine pitch adjusters out of range (of course), the decision is made to correct the overall pitch in the Main chain using the coarse adjusters, regain the range of the fine adjusters, re-diagonalize OSEMs, and measure all in the morning.

Images attached to this report