Jeff and Thomas went in the BSC3 chamber to do some B&K measurements on the arm cavity baffle.

I ran a quick transfer function on Stage1 after that to see if everything was still okay, since we had some weird interation between the ISI and the baffle yesterday (see aLOG #8632). Well, it is not okay...  (see plot attached)

Some huge overdamping/frequency drifting suddenly appeared. We don't know what could cause that yet (eddy current? cable rubbing?).

To keep going with this unit, we really need to understand what's happening. We'll continue the investigation tomorrow.