https://wiki.ligo.org/viewauth/DetChar/DataQuality/DQShiftLHO20160104

• We were plagued with a decreasing POP power which made locking for long periods of time unstable, many fixes were attempted such as re-alignment of the recycling optics and the test masses. The silver-lining was that we were given opportunities to fix a few problems while trying to relock.
  • ALS fiber polarizations were re-adjusted Travis
  • Mich Dark was fixed by Kiwamu
  • Recycling gains were optimized by Sheila, Cheryl, and Jenne
• This Tuesday was the start of calibration measurements during the day.