To help characterize the recent issues we've seen with IFO alignment that are familiar to the output change in late April, I moved SR3 in 10W single-bounce configuration with the SRC2 ASC loop on so that SR2 would follow (ALIGN_IFO's SR2_ALIGN state), much like in alog77694. I moved SR3 far enough in each direction (+/- pitch and yaw) to bring the ASC-AS_C_NSUM signal back up to our target value of 0.022, which I was successful doing in every direction except -Y, where I could only bring AS_C up to 0.018. In the three directions where I was successful, the beam spot on the AS AIR camera looked much more like the clear circle we're used to seeing and less like the upside-down apostrophe we have now.
It seems that our old output spot (starting place in TJ's alog) is still bad (-Y direction with SR3 from current place) since that was the only direction where I couldn't get the AS_C power back up.
Slider values of SR3 after each move:
Start | +P move | -P move | +Y move | -Y move | |
SR3 P slider | 438.7 | 651.1 | 138.7 | 438.7 | 438.7 |
SR3 Y slider | 122.2 | 122.2 | 122.2 | 322.2 | -167.8 |
Attachment 1 is the starting AS AIR camera image (and our current spot), attachment 2 is after the +P move, attachment 3 is after the -P move, and attachment 4 is after the +Y move.
|
Before |
+P move
|
-P move
|
+Y move
|
-Y move
|
Time
|
1404952764
2024/07/14 00:39:06 UTC
|
1404955465
2024/07/14 01:24:07 UTC
|
1404958133
2024/07/14 02:08:35 UTC
|
1404959716
2024/07/14 02:34:58 UTC
|
1404963518
2024/07/14 03:38:20 UTC
|
H1:SUS-SR3_M1_OPTICALIGN_P_OFFSET
|
438.7 |
651.1
|
138.7
|
438.7
|
438.7
|
H1:SUS-SR3_M1_OPTICALIGN_Y_OFFSET
|
438.7 |
122.2
|
122.2
|
322.2
|
-167.8
|
H1:SUS-SRM_M1_DAMP_P_INMON
|
-1033.7 |
-1035.2
|
-1036.3
|
-1036.1
|
-1037.1
|
H1:SUS-SRM_M1_DAMP_Y_INMON
|
913.7 |
914.0
|
914.1
|
914.1
|
914.2
|
H1:SUS-SR2_M1_DAMP_P_INMON
|
597.7 |
-871.6
|
2660.2
|
614.7
|
566.2
|
H1:SUS-SR2_M1_DAMP_Y_INMON
|
1125.3 |
1179.9
|
1069.3
|
1878.8
|
-72.4
|
H1:SUS-SR3_M1_DAMP_P_INMON
|
-290.2 |
-57.7
|
-619.4
|
-297.9
|
-279.1
|
H1:SUS-SR3_M1_DAMP_Y_INMON
|
-411.0 |
-425.2
|
-390.4
|
-256.9
|
-633.7
|
Here are the OSEM values, so that Alena can cotinine her 78268 analysis of the OFI beam spot position.
Adding a screenshot of sliders for the -P alignment above, after initial alignment.