We checked the alignment on the ITF that, according with the observation of the beam spots ITF on SQB1_cam0 and cam1, we find the 4MHz beat magnitude on the B1. We maximized the latest a little beat by engaging the  AA and by moving SQB1_M32 and 33 as usual. We also  checked  the RR position, 

(it seems fine) and the SQB1 positon LC_X (moved from -3400 to -3300). 

At the end he best value for the 4MHZ mag achieved was 1.52 mV (CC_phase in ASQZ) compared the initial value  1.32 mV. This relative low value is due to the low SQZ production caused by the MZ working point that we were forced to set at lower value than usual (MZ_DC offset from 0.046 V - last shift vlue - to 0.035 V) to lock it -  corresponding to about OPA_PD_DC ~ 1.68 V against the usual past value >=2.0V.

N.B.: To check if after the DETLAb humidity stabilization the  MZ alignment has been optimized

System Left with 

• SDB1_shutter open I f needed we can close tomorrow morning);

• SQB1_shutter closed; 

• SQZ_Fast_shutter closed;