The light level on the PMC locking photodiode was reduced to ~100 mV when the PMC is unlocked.  In a prior
adjustment, the light level was ~250 mV and the gain slider was at -10 dB.  The current setting for the gain
slider is 8 dB.  With these settings the PMC servo has a UGF of ~1 kHz (as per the attached screen shot
from the SR785).

    The alignment of the reference cavity was improved.  One of the lenses in the beam path L12 was re-centered
onto the beam, and its mount was re-positioned so that it wasn't butting up against a mirror mount.  The
cavity visibility was measured to be ~80%.  In making the adjustments, the reference cavity transmission
signal increased from ~2.4 V to ~3.4 V with the ISS off.  This morning things seem to have relaxed so that
the signal is somewhat less (~2.6 V with the ISS on).

    The optic directing light to the reflection CCD camera was changed out to give more light to the
camera.  So the reflected spot on the quad display will look different.

    For reference's sake, it appears that L12 wants to move away from the reference cavity to improve the
mode matching further.


  Rick / Peter