LIGO-G070081-00-Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 SixtyHertzMon Update Junyi Zhang & Keith Riles (University of Michigan)

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Presentation transcript:

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 SixtyHertzMon Update Junyi Zhang & Keith Riles (University of Michigan) LIGO Scientific Collaboration Meeting Baton Rouge – March 21, 2007

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 2 SixtyHertzMon – Reminder of Method Idea: Upconversion artifacts due to 60 Hz should track the slight frequency variations of power mains Scheme: 1) Heterodyne DARM_ERR w.r.t. fixed 60 Hz signal (control) 2) Heterodyne DARM_ERR w.r.t, varying 60 Hz signal (frequency measured each minute from voltage monitor) Compare spectra near 60 Hz (or higher harmonic) from 1) and 2): If artifact is sharper in 2) than in 1), then 60 Hz is likely source If artifact is sharper in 1) than in 2), 60 Hz source unlikely

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 3 Status Developed offline in summer/fall 2006 and used to examine a pulsar search outlier (78.6 Hz  NOT a roll-mode sideband) Fixed these problems and launched new programs in February to cover Hz for 60 Hz, 120 Hz, and 180 Hz (documentation online) Found some operational problems: Turning on/off of calibration lines not handled well Temporary dropout of voltage monitor channel caused crashes Inefficient to devote one monitor per 60 Hz harmonic Initial online trial in January/February covering ±30 Hz band around 60 Hz for H1, H2, and L1

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 4 Example – H1 180 Hz Region “Rich” structure

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 5 Zooming in frequency Red curve is heterodyned (narrower/higher for true sideband)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 6 Zooming in power Fine structure more visible (magnified by factor of 180/60 = 3)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 7 H1 12-Hz sidebands

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 8 Other 1 Hz Lines 3 Hz Lines Other 1 Hz Lines 3 Hz Lines Other 1 Hz Lines 3 Hz Lines Other 1 Hz Lines 3 Hz Lines

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 9 L1 structure

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 10 Summary SixtyHertzMon running stably and documented Flagging 60 Hz / 120 Hz / 180 Hz sidebands in archived log files Producing online plots for follow-up investigation of reported sidebands