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AdV-ISC (Commissioning up to first full interferometer lock)
mantovani - 9:19 Thursday 29 September 2022 (57232) Print this report
SR misaligned of 3 and 5 urad images on B1p Cam

In order to evaluate how much 3 urad and 5urad misalignment of SR are effecting the recycling in the SRC, two images of B1p are taken.

It is visible that also for 3urad the beam bounces are present.

Images attached to this report
Comments to this report:
flaminio - 15:10 Thursday 29 September 2022 (57241) Print this report
This test shows that with 3 urad of misalignment the reflection from the SR mirror still affects the dark fringe beam.
It would be interesting to misalign the SR mirror by a "large" angle (somewhere in the range 5 to 20 microrad) and try to lock the ITF in this configuration (so with no SRCL control).
By doing so we could observe the dark fringe with the hot interferometer without being confused by the SR mirror.
Such observation of the dark fringe could help considerably the tuning of the thermal actuators.
mantovani - 15:31 Thursday 29 September 2022 (57243) Print this report

This test will be done tomorrow morning (if the ITF can lock). What I would like to test is not to acquire the lock with a misaligned SR but misalign the SR after having locked carm0 of at least 5 urad.

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