camilla.compton@LIGO.ORG - posted 09:12, Tuesday 25 June 2024 - last comment - 14:50, Tuesday 25 June 2024(78641)
Swapped Laser Locking Fiber Beat Note Chassis back to Original
Fil, Camilla
After finding that the sqz laser glitches may be linked ot the last 9th May TTFSS swap 78549, today Fil and I swapped D2300329 Laser Locking Fiber Beat Note Chassis back to the original.
Installed Chassis S2300258
Removed Chassis (but left in the rack) S2300259
To avoid issues seen after swapping chassis before 77754, 77746 we may want to adjust TTFSS beatnote threshold polarization as RFAMP has dropped from 7.7 to 1.8dB. Plot
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Touched the "To Beat Note" SQZT0 waveplates to increase RFMON from 2.5 to 6bDM. Previous value was 8dBm but max I could get was 6. Expect this will be fine.
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