Reports until 10:51, Thursday 29 February 2024
H1 ISC
jennifer.wright@LIGO.ORG - posted 10:51, Thursday 29 February 2024 - last comment - 11:10, Thursday 29 February 2024(76048)
Checking OMC Alignment after yesterday

15:40 UTC started efforts.

Checked ITMY was mis-aligned and IMTX aligned. Beam on AS AIR camera at HAM6.

Turned on SR2CP and SR2CY ASC loops with gain of 10 after checking input and output matrixes to check they were still routed just to SR2 position.

Moves beam up to centre on AS C QPD.

Made beams more aligned on QPD A and B.

Dialed the PZT offset PZT2 up from about 30 counts to find the TM00 mode at abput 2mA on the DCPD_SUM_OUPUT.

Locked with gain of one after turning off boost and int filters and clearing history.

Turned gain up to 10, waited, turned on int, waited, turned on boost, waited, turned gain up to 24.

Beam still roughly centred on OMC QPD A and B.

Movement unlocked OMC at 18:12 UTC but it relocked without me doing anything which is good.

Turned on ASC loops with gain of 0.025 on mastergain and no integrators and they locked well within 1 count of 0 on output of all 4 OMC ASC loops. Then I turned on the integrator for POS X loop and POS X and ANG X outputs started to go crazy so I turned it off.

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jennifer.wright@LIGO.ORG - 11:10, Thursday 29 February 2024 (76054)

Turning on all four integrators in the servos while the OMC ASC loops are running seems to work somewhat for Y direction (pitch loops) but not for X (YAW loops).

In the image first cursor is when I turned the integrators on and second when I switched off the OMC ASC fb. I am always using an overall gain of 0.025.

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