Download - CMS Motion Measurements
CMS Motion Measurements
Mechanical Measurement Lab, 2009.21.09EDMS no. 1027459
2Mechanical Measurement Lab [email protected]
Equipment
• Two geophones and the MKII acquisition system were used for the measurements.
• To measure the ground vibration, two geophones were placed close together on the floor under the detector
• To discover the behaviour of different parts of the experiment reference geophone was placed on the ground and other one was placed on the appropriate part.
3Mechanical Measurement Lab [email protected]
Ground motion measurement• To measure the ground vibration, two geophones were placed close together on the
floor under YB0.• The measurements were provided while the cooling systems were off.
4Mechanical Measurement Lab [email protected]
1 10 100Hz
OOR
OOR
OOR
OOR
1000z
10a
100a
1000a
10f
100f
1p
10p
((m)²/Hz)GP_Ref (V)GP (V)
YB0 motion measurement
PSD of the signals Vertical direction
Geophones
1 10 100Hz
OOR
OOR
OOR
OOR
1000z
10a
100a
1000a
10f
100f
1p
10p
((m)²/Hz)GP_Ref (N/S)GP (N/S)
PSD of the signals Beam direction
Cooling system OFF
5Mechanical Measurement Lab [email protected]
HF structure motion measurementPSD of the signals Vertical direction
Geophones
PSD of the signals Beam direction100m 1 10 100Hz
OOR
OOR
OOR
OOR
1000z
10a
100a
1000a
10f
100f
1p
10p
((m)²/Hz)GP_Ref (V)GP (V)
100m 1 10 100Hz
OOR
OOR
OOR
OOR
1000z
10a
100a
1000a
10f
100f
1p
10p
((m)²/Hz)GP_Ref (N/S)GP (N/S)
Cooling system OFF
6Mechanical Measurement Lab [email protected]
Next Step
• Measurement of the motions of rotating shielding.
Geophones
