[Robert, Jenne]

This morning we locked DRMI and moved various optics around while Robert took video to see if the beam on the HAM5 side of the septum moves at all.  Robert reported as we were working that he didn't see any obvious movement of that beam, but I'm sure he'll have more details after he's had a chance to review the movies.

We moved SR3 by 28 urad, we moved PR3 by several urad, we moved both ITMs by a few urad each, and I put an offset of 0.7 in the DC3 loop to move OM1 just in case the beam was somehow coming back through that septum viewport.  We also put 1.4 Hz excitations into each of the 3 dofs of the OFI to make it move rail-to-rail on its (weak) actuators.  Last week we had moved the OFI to the edge of its range in yaw, and had also moved ZM2 to the edge of its range, as well as put offsets into the AS_C SRC loop.  So far, nothing seems to move the beam. 

Robert will have more details later, but the beam is quite weak when we have the PRMI locked, even if I bring the power up to 20W injected.  But as soon as the SRM comes into alignment, the beam shows up clearly with DRMI flashes. (The fast shutter was closed when we did that test last week).

The work this week and last Tuesday was all done DRMI-only, with the ETMs misaligned, and DRMI ASC on.  I am running low on ideas of where this beam could be coming from, if I can't move it even the slightest bit with these optic moves.