Midooka-san, Eleonora (with some help from Shoda-san and Izumi-san)
In order to improve the diagonalization of the IM OSEM sensing we have tried a more conservative approach with respect to this one (which was not very successful).
We have checked the spectrum of all the undamped d.o.f and individuate the respective resonances. Then we have looked at the response of the each OSEM in correspondance of each resonance and tweaked the OSEM2EUL matrix in order to adjust the relative weight of each sensons according to the signal that we expected to see.
An advantage of this approach is that, since we don’t drive the system, we are independent of any unbalancing of the driving.
The sensing diagonalization seems improved. In the attached picture there is the comparison between the old and the new cross TF of vertical d.o.f. which was showing the largest coupling.
A screenshot of the old and the new OSEM2EUL matrix is also attached.
NEXT STEP: diagonalization of the driving.
