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Virgo Runs (O3)
Nenci - 6:58 Wednesday 15 May 2019 (45893) Print this report
Operator Report - Night Shift

At the start of the shift the ITF lock was unstable, therefore after the first unlock I followed the istructions of the expert and I tried to lock with the drift control activated. After this operation the ITF remained locked all the night (Bns Range ~48 Mpc.).

Guard Tour UTC
22:09  - 22:42
00:04  - 00:37
02:07  - 02:39
04:02  - 04:31

Comments to this report:
gosselin, pillant - 12:14 Wednesday 15 May 2019 (45896) Print this report

From remote we thought that the Automatic Alignement was the problem. Especially since we realigned the BPC in the morning and therefore slightly changed the reflection from the IMC, used to create the error signal.
However by giving a better look this morning it appeared that they were fast unlocks (plot 1 the first unlock, plot 2 the last one, for example). 
It is not clear to us while putting the AA in drift control would have calmed down the fast unlock crisis.
In any case, the ITF remained locked all the night. Next time it will unlock, the AA in full bandwith will be re-engage by the metatron and we can keep it like this.

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