Tonight I moved the power recycling cavity axis around to try to center the spots on the ITMs.  I was moving PR2 around, and the IFO's ASC followed me.  It was a pretty significant move - enough that we no longer had green hitting the transmission cameras at the vertex.  The carrier power recycling gain never really changed, but the sideband recycling gain decreased.  I couldn't seem to recover this, even by moving the input beam (IM3 and a little IM2), so I have to think more about this.

Anyhow, when I tried to increase the power from 12W to 15W, I saw the ~0.5Hz pitch oscillations that Sheila describes in alog 26367. In general, the ASC loops are stable, however as we saw last night, it's very hard to get any coherence right near this peak, so I can't say for sure that we don't have a loop issue. 

Big EQ in Japan, so we're calling it an early night.