Sheila, Camilla, Ryan

After yesterday 91497 and today's checked we are finished with HAM7, it's been handed over to Jim for SEI checks. 

Sheila aligned the IFO in single bounce off ITMY to the OMC:

• Locked SRY (with ALIGN_IFO GRD)
• AS centering offloaded (using ALIGN_IFO GRD)
• Aligned SRM, Sheila had to move SRM a lot to get beam on AS_AIR camera
• Fine adjusted alignment of SRM to get SRY to lock
• Used SRY  locked in ALGIN IFO GRD but the WWFS centering failed:
• SRC1 Pitch seems to have a sign flip or similar and is;nt working. Sheila closed SRC1 YAW and SRC2 Pitch and Yaw and is by hand moving SRM Pitch to zero SRC1 Pitch error signal. This did help the buildups. Maybe the sign flip was just as we started too far away.
• Offloaded alignment by manual-ing to ALIGN IFO OFFLOAD_SRC_ALGINMENT and offloading DC centering by manual-ing to OFFLOAD_AS_CENTERING
• Now are happy with output arm.

Check SQZ alignment with this SRM/OMs alignment:

• Misaligned SR2 and SR3 and injected SQZ beam.
• Ran our modified SQZ ASC 90742 using ZM4 and ZM5 (which now have a lot more range 91431), this was able to center in AS_A,B. Not too far from OMC A and B.  See attached.
• We offloaded the SQZ ASC using SQZ_MANAGER state OFFLOAD_SQZ_ASC

Backscatter test, repeating 88609:

• Misaligned SRM to get single bounce IFO beam to the OMC
• Locked OMC
• Increased input power to 50W
• Turned on ISS with IMC_LOCK grd ISS_ON
• Ran /sqz/h1/Templates/dtt/OMC_single_bounce_scatter_check_August13.xml
• The background noise looked worse than in January 88609 so, we tested with and without the ISS, the ISS was helping, we also have an earthquake passing through. 
• We put an 1 Hz excitation of 1000 counts amplitude on ZM5 TEST,
• Could not see a scattering shelf as in December, see attached, this is expected as in the January vent this should have been fixed. 
• Plot attached, no scatter shelf visible, the large peaks we expect are from the ISS array not being well aligned.