Contributions from Vlad, Beverly and many other LHO commissioners.

Full DQ shift: link

• Observing 74.9% of the time

• Mean observing range ~ 108 Mpc, overall the range varied from 98 to 119 Mpc

• High seasonal microseismic activity (~0.5µm) that couples to scattering

  • produces lots of small SNR glitches in 25-35Hz band
     
• Glitches at 40, 50 and 60Hz possibly caused by ACDC power to the Beckhoff motor controller
  • aLOG 53242
  • coincide with the NCAL installation
  • turned off ACDC power, data seems a bit better
  • needs to be followed-up and investigated further
  • Evan Goetz mentioned at the DQ call that leaving NCAL as it is could be a problem for continuous waves searches

• Air compressor noise at ~36Hz

  • identified and tested
  • see  aLOG 53241, aLOG 53248
  • produces noise if powered on
  • needs to be fixed

• Lots of downtime and bad data due to ground motion caused by wind fence installation

• Hveto winners: PEM-EX_ADC_0_18_OUT_DQ, ASC-DHARD_Y_OUT_DQ and other channels closely related to these two

  • Explained by

    • high microseismic activity producing scattering

    • ground motion noise caused by wind fence installation

• Spectra: no major changes
• Missing PCAL summary pages since Nov 13 (https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20191113/cal/pcal_summary/)
• Task for the next DQ shift
  • try to find the reason for high SNR glitches between 60-120Hz range