Kiwamu, Nic, Jamie, Lisa

After  peeking down the X arm and fixing the  ITMX isolation loops , the plan for tonight was:

1) re-establish the corner alignment after the X arm was locked and aligned today;
2) make sure that with this new alignment we have a POP beam;
3) re-lock PRMI on the carrier;
4) evaluate effectiveness of new BS baffles;
5) lock DRMI on sidebands

Status
------

1) DONE 
2) DONE
3) Not quite - With the new alignment, locking the PRMI on carrier was not as easy as it was last Friday. The power in POP is higher than before and POPAIR_B, currently used for PRCL normalization, was saturating (see plot attached, every time POP AIR saturates there is a glitch in the control signals). Kiwamu reduced the BBPD electronic gain by a factor of 10, but then the normalized signal became too noisy. So the current plan is to bring back to life the POPAIR_A diode, which, according to Kiwamu, is currently blocked by a camera.



Notable event:

* 6.15 UTC, Sep 4 - Earthquake - SEI and SUS didn't trip, but the corner optics moved like crazy for ~20 minutes