I continued the health assessment of the IM OSEMs:

• I applied sinusoidal actuation signals at individual OSEMs and all flags seem to be moving, however, they might not be moving freely.
• I compared the free swing motion of PR3 OSEMs with PRM OSEMs, and the displacement measured by the horizontal OSEMs look very different, especially in H1. See the picture attached.
  • The readout in PR3 H1 OSEM looks very noise, while the one in PRM H1 OSEM look far cleaner. The H1 flag might be rubbing.
  • The readout in PR3 H2 and H3 OSEMs have noise-like features also, but not as bad as in H1.
  • The PR3 vertical OSEMs look better although it's possible to see small noise-like features sometimes.
• So far IM-Y has been at 1,783 urad, which is very large. I moved it -15 urad and in the process H1 OSEM jumped suddenly. See pictures.
• I measured IM-L transfer function and it's still bad.

We will go to the tunnel to do visual inspection of the OSEM flags.