The mechanical response of WI mirror actuated by each coil has been measured at CARM NULL. A broadband noise has been injected, able to provide a measurement up to 800 Hz (fig 1). The results are quite similar and no unexpected structure is visible. The structures at 150 Hz and 200 Hz are due to notches in DARM control filter. At 491 Hz the measurement is bad because of the injected line. The conclusion is that the three magnets are correctly glued to WI mirror.
The broadband noise injection has been done also on NI MIR coils. The mechanical response of each coil (fig 1) is very similar to the one obtained for WI.
