Still,
energy can reach the system through the stainless steel tubing connecting the
pumps, on the floor, to the vacuum chamber.
Though the frequency is low (much less than the 1st mode
resonance of any beam) and therefore is not expected to excite the cantilevers,
the roughing pump has a noticeable vibration.
Impulse noises (doors slamming, loud staccato noises) from the environment
have been observed to, at times, excite the first mode resonance. Measurements are made when the room is and
has been quiet.
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