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Reports until 14:34, Thursday 05 January 2023
H1 SQZ
dhruva.ganapathy@LIGO.ORG - posted 14:34, Thursday 05 January 2023 (66662)
Beam centered on FC1 and FC2

With the alignment control running, we decided to move the ZMs so center the beam on the FC mirrors. In order to do this, I used Naoki's FC dither template and switched off all the A->L gains in the M3 drive align matrices. The dithers were at 10 Hz (FC2 P), 18 Hz(FC2 Y), 14 Hz (FC1 P), and 16 Hz(FC1 Y). I then moved ZM2 and ZM3 in order to reduce the lines (on the FCGS slow signal) from these dithers to 0. The last step was to move FC1 and FC2 to offload the signal from the alignment control to the FC sliders. The reference trace in the FC2 plot was taken with yaw centered but pitch off center (hence the line at 10Hz) 

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