During the maintenance, we installed a shaker on the laser bench, see the attached Figures 1 and 2.
We checked the optimal parameter configuration to have the maximum displacement of the bench:
- freq. line injected at 17.9 Hz (laser bench horizontal resonance)
- voltage amplitude 0.1 V.
Looking at the episensor ENV_LB_SEIS_*, we achieved a spectral displacement of the laser bench at 17.9 Hz:
| channel direction | ||
| x | ~1e-2 | ~0.8 |
| y | ~1e-3 | ~0.08 |
| z | ~4e-2 | ~3.2 |
We checked that this injected line was not visible on EIB, Figure 3.
We also tried to inject lines in the freq. range (1-5) Hz but the maximum displacement achieved was lower by a factor of ten.
