Virgo Logbook

Reports 1-1 of 1

Environmental Monitoring (Environmental Monitoring)

Fiori, Tringali, Pinto - 20:54 Thursday 27 November 2025 (68270)

Acoustic injections in WEB, Det Lab and INJ lab

Acoustic injections were performed only in the following areas, as they had not been carried out during the last time (#68224): WEB, DET Lab, and INJ Lab.

Since the interferometer unlocked during the injection at WEB, we reduced the amplitude from 0.1 to 0.01 and this adjustment worked.

Below are the output files of the injections (/virgoData/NoiseInjections/AcousticInjectionsO4/output/):

AcousticColored_NOISE_WEB-1448305742.txt
AcousticColored_NOISE_CEB_DetLab_speaker_1-1448306091.txt
AcousticColored_NOISE_CEB_EEroom-1448306439.txt

Images attached to this report

68270_1764273193_20251127_acoustic_injections_trend.png

68270_1764273213_20251127_acoustic_injection_WEB_DET_INJ.png

Comments to this report:

Tringali - 12:56 Saturday 29 November 2025 (68282)

I checked the past data of WEB acoustic injections by inspecting the noise levels sent to the DAC: both in September (blue curve) and in November (green curve), the levels were identical. Therefore, it is not clear why an amplitude of 0.1 caused the interferometer to lose lock.

To safely perform the WEB acoustic injection, we keep the amplitude at 0.01 (pink curve), as done on November 27.

Images attached to this comment