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Noise measurements of the auxiliary CO2 laser system chiller
July 24, 2026
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11:00 UTC - Start of measurements

13:11 UCT - Accelerometer and triaxial magnetometer installed on top of the chiller.

13:17 UTC - Cooling fan ON


13:28 UTC - Cooling fan OFF

13:32 - Cooling fan ON (TCS chiller room door open)

13:42 UTC - Accelerometer moved to the supply water pipe (cooling fan OFF)

13:48 UTC - Cooling fan ON

13:53 UTC -  Accelerometer moved to the fan coil.

13:55 UTC -  Cooling fan OFF. Accelerometer moved back on top of the chiller

13:57 UTC- Chiller switched OFF using the front-panel power button (Nicola and Marco entered the room)

Note: Throughout this section, "cooling fan OFF" indicates that only the fan was not operating. The chiller remained powered on unless explicitly stated as "chiller switched OFF".


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*** Measurements with the chiller switched OFF ***
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14:09 UTC - Chiller switched OFF using the front-panel power button. Accelerometer on top of the chiller.

14:20 UTC - Accelerometer moved to the floor
14:29 UTC - Accelerometer moved to the supply water pipe
14:35 UTC - End of measurements


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****** Repeated measurements (accelerometer was accidentally OFF)************
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14:38 UTC - Accelerometer on the supply water pipe but the accelerometer was found detached from the supply water pipe after falling from its mounting point.

14:45 UTC - Accelerometer moved to the floor.
14:51 UTC - Accelerometer moved to the top of the chiller.
14:57 UTC -  End of measurements.