Peter, Stefan,

We went through all 4 OMC alignment degrees of freedom, stepping the APD offsets by about 0.1 in either direction. At the same time we monitored the 331.9Hz cal line. In all 8 directions we saw the optical gain.

We still want to try a proper beam-walking optimization - according to the design (T1000276) the QPDs are 31.1deg apart in Gouy phase.