Virgo Logbook

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Environmental Monitoring (Environmental Monitoring)

Paoletti, Fiori - 12:37 Tuesday 01 August 2023 (61062)

Accelerometers installed on IB and PR turbo pumps

Today, as of 10:00 UTC, two new accelerometers were installed and acquired in the CEB, positioned on the turbo pumps of the IB and PR towers.

Their name is

ENV_IB_TURBO_ACC (SN 5031)

and

ENV_PR_TURBO_ACC (SN 5005)

The goal is to monitor the vibrations of these pumps as best as possible, because we think that their line around 401 Hz (and also the harmonics) are visible in hrec.
Note that while IB's turbo pump is directly connected to the tower itself, PR's is via a bellows which should introduce a seismic decoupling. Its effect in hrec should therefore be less. However, the two accelerometers were mounted in the same way: connected to the pump body.

Note: there are low frequency lines that are coherent between these two accelerometers at 16.43 Hz, 18.53 Hz and 44.64 Hz

Images attached to this report

Comments to this report:

Paoletti - 16:17 Tuesday 01 August 2023 (61071)

In today's last lock there is a line in hrec that is clearly coherent with the accelerometer placed on the IB Turbo pump, while it is not with the one placed above the PR Turbo pump.

There is also very little coherence at the second harmonic (802 Hz), nothing more going up in frequency.

Images attached to this comment

Paoletti - 9:38 Tuesday 08 August 2023 (61162)

Today at 07:36 UTC the two accelerometers have been removed.