J. Kissel

Remembering that we may need to re-balance the recycling-cavity HSTS drives after having replaced the lower stage drivers with increased-range, modified, coil drivers (PRM, PR2, SR2, SRM; see Integration Issue 936 for links log entries), I began to balance SRM M3 this morning. 

I used the same pringle-drive, demodulation-of-the-OSEM-sensors, balancing technique that we've used in the past (see e.g., LHO aLOGs 11392, or 9453). 

I was able to confirm that the balancing *is* now worse by a factor of ~6 (by not changing the previous COILOUTF gains and simply comparing the new results with the balanced old), but was unable to balance to many better than this newly bad value. My time was limited because of priority DRMI work, but I'll continue to investigate as time allows. For now, I've left the COILOUTF gains as they were balanced to the unmodified driver, 
 
H1:SUS-SRM_M3_COILOUTF_UL_GAIN  0.972
H1:SUS-SRM_M3_COILOUTF_LL_GAIN -1.014
H1:SUS-SRM_M3_COILOUTF_UR_GAIN -0.972
H1:SUS-SRM_M3_COILOUTF_LR_GAIN  0.964

See attached for plots.

Plots, Data, and Diary live in and have been committed to
/ligo/svncommon/SusSVN/sus/trunk/HSTS/H1/SRM/Common/Data/