Stefan, Sheila, Terra, Ed and Nutsinee

We have found that alingment and TCS together can improve our noise hump from 100Hz-1kHz.  We have reverted both alignment and TCS changes to July, and we seem to be stable at 50Watts with a carrier recycling gain around 28. 

TImes: 

22:18:18 Oct 23rd (before alingment move, at 40Watts) and 22:28:12 (after)

ten minutes of data starting at 23:33:33 is with the better alingment at 40 Watts, 10 minutes starting at 0:19 UTC Oct 23 is at 50 Watts.  (we redid A2L at 40 Watts, but not 50 Watts, there is MICH and SRCL FF retuning still to be done.)

We saw that the TCS changes of the last few days made a small improvement in the broadband noise lump from 200Hz -1kHz, so we decided to retry several of the noise test we had done before without sucsess.  We only moved the POPA spot position in PItch, moving it in yaw made the carrier recycling gain drop but didn't help the noise.  The attached screenshot shows the spectra, and the coherence with IMC WFS, our best jitter sensors in lock.  We have lots of coherence with these signals, at frequencies above where the HPO changed the spectra.