travis.sadecki@LIGO.ORG - posted 11:15, Thursday 20 August 2015 - last comment - 12:49, Thursday 20 August 2015(20712)
ALS PZTs misaligned
Keita noticed that the ALS laser was still present in the arms. With his assistance, I have misaligned the PZT2_PIT for both the arms and the PZT1_PIT for the X arm. This brought our range back to where it was prior to the 'big dip'.
We will need to remember to relign these when we need the ALS system next.
Note for data analysts: This misalignment occurred at ~17:40, with the Intent Bit still set to Undisturbed.
What happened to our shutters?
Shutters were closed at ~18:45 UTC. Sheila has since returned the shutters and beam diverters to their appropriate states in Guardian. The ALS Guardians will need to be reloaded when they are needed again.