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Environmental Monitoring (Environmental Monitoring)

Tringali, Fiori, Loche, Paoletti, Spinicelli - 18:21 Tuesday 23 September 2025 (67772)

Laser Lab acoustic injection: setup and tests

In view of the implementation of the acoustic injection via the METRATON node, a loudspeaker was installed in the Laser Lab (left corner) and powered through a standard UPS socket (Figure 1). The dedicated DAC channel NOISE_CEB_INJElecroom in the Injection Electronic Room (“piscina”) could not be used, since no free cable was available to connect the DAC to the loudspeaker position in the laboratory. As a temporary solution, the DAC channel in the EEroom was employed. Further details are reported below

DAQ box 40, SN 26
Channel used: 4
Channel name: NOISE_CEB_EEroom

Some values were tested on the DAC channel to verify that the EIB controls were not perturbed. The value chosen to be sent to the DAC is 0.1.

The acoustic injection was tested via the METRATON node, and the setup is working properly.

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Comments to this report:

Tringali, Fiori, Spinicelli, Zaza - 0:40 Wednesday 12 November 2025 (68143)

The purpose of this shift was to test a set of values sent to the DAC channel ENV_Noise_CEB_EE_room.
Only two values were tested due to some issues with the lock stability.

Each injection lasted 180 seconds and was performed via the METATRON node.

Some comments are reported below:

The ITF unlock was not caused by the acoustic injections (see Figure 1).
Figure 2 shows several monitoring signals from the BPC (BsX_*), the microphones, and their coherence with Hrec, while Figure 3 displays the same signals with a zoom around 800 Hz. At this frequency, Hrec exhibits a coherent structure with some of the BPC signals, suggesting a possible coupling path.
Figure 4 shows the DAC noise levels.
Figures 5 and 6 show the acoustic spectra during the injections.
Figures 7 and 8 show the vibration of the benches during the injections.
Figure 9 shows the structures excited in Hrec in the frequency range 100–1000 Hz.

Value	Time (UTC)
0.01	17:48:20
0.02	17:54:48
---	ITF unlock at 17:59

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