Reed E., Erik K., Matt E.

In order to explore the possibility that the big glitches in DARM come from ambient dust events in the arms, we took a look at the transmitted power signals.  In a perfect world, these should dip if something falls trough the beam.

We found that that dust glitches also appear in the X and Y TR signals (e.g., ASC-{X,Y}_TR_{A,B}_NSUM_OUT_DQ) with large amplitude (see first 2 plots).  Interestingly, both arms are affected, though the arm where the dust is not falling appears to see a low-passed version of the disturbance (e.g., via the DARM cavity pole).

Some of the glitches looked at by Gabriele also seem to appear weakly in the TR signals, though a more sophisticated analysis will be needed to draw conclusions about the efficiency of these signals as a veto.