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Virgo Runs (O3)
nardecchia, fafone, rocchi - 17:49 Wednesday 24 April 2019 (45727) Print this report
Comment to Operator Report - Morning Shift 24 April 2019 (45721)
The WI CO2 laser power is fluctuating, probably due to the increase of the environmental temperature which in turn, causes the oscillation of the laser temperature (see fig. 1).
This oscillation could trigger a change of the polarization state of the beam, altering the DAS power value projected on the CP.
During the last TCS tuning before the beginning O3, I rotated the DAS OUT half-wave plate to not inject power in the ITF.
Since the laser status changed I used the flip mirror to block the beam on the CO2 bench to prevent the risk of projecting any power on the CP.
I asked the operator to put the ITF in 'Adjusting' during the intervention, from 14.54.16 to 15.00.15 UTC.
A tuning of the chiller settings probably is needed to stabilize the laser.
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