Camilla, Sheila, Jennie W

After we restarted the SQZ MANAGER this morning we took the SQZ angle test to see how the squeezing changes with a thermalised IFO if we step through optimum  squeezing through tuning the ADF phase. This ran into some problems when we tried to start at 85 and 90 degrees as the loop seemed to run through a really wide range of phases (we think the loop was diverging). Camilla manually changed the ADF phase to 110 degrees and we restarted the test so it stpped up in steps of 3 degrees every 2 minutes. We changed this halfway through to have a longer time between steps for the loop to follow. The test was stopped at 161 degrees.

We stepped SQZ-ADF_OMC_TRANS_PHASE 

GPS 1395157776  PHASE = 110

H1:SQZ-ADF_OMC_TRANS_PHASE = 113
H1:SQZ-ADF_OMC_TRANS_PHASE = 116
H1:SQZ-ADF_OMC_TRANS_PHASE = 119

H1:SQZ-ADF_OMC_TRANS_PHASE = 122
H1:SQZ-ADF_OMC_TRANS_PHASE = 125
H1:SQZ-ADF_OMC_TRANS_PHASE = 128
H1:SQZ-ADF_OMC_TRANS_PHASE = 131
H1:SQZ-ADF_OMC_TRANS_PHASE = 134
H1:SQZ-ADF_OMC_TRANS_PHASE = 137
H1:SQZ-ADF_OMC_TRANS_PHASE = 140
H1:SQZ-ADF_OMC_TRANS_PHASE = 143
H1:SQZ-ADF_OMC_TRANS_PHASE = 146
H1:SQZ-ADF_OMC_TRANS_PHASE = 149
H1:SQZ-ADF_OMC_TRANS_PHASE = 152
H1:SQZ-ADF_OMC_TRANS_PHASE = 155
H1:SQZ-ADF_OMC_TRANS_PHASE = 158
H1:SQZ-ADF_OMC_TRANS_PHASE = 161
 

Phase was put back to 130 degrees after the test at GPS 1395160576.

First image shows the SQZ BLRMS that show how squeezing gets better and worse during the test, calibrated in dBs. Then below this the CLF phase, the OMC trans phase which we are changing and the range at the bottom.

Second image attached shows the same BLRMS (in counts before and just after the test on the bottom left) and the CLF phase and OMC trans phase on the bottom right. From the blue trace just before the test you can see the sign flip when we tried to start the test at 100.

NB: we had been locked for over 6 hours when we started but squeezing wasn't injected until around 20 minutes before the test started.