LIGO-G060410-00-Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 StrainBandsMon and SixtyHertzMon 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 StrainBandsMon and SixtyHertzMon Keith Riles (University of Michigan) (for Ramon Armen & Junyi Zhang) LIGO Scientific Collaboration Meeting LSU – August 16, 2006

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 2 StrainBandsMon (Ramon Armen) from Rana last September (from Hannover): Why doesn’t LIGO track band-limited RMS calibrated strain? (the way GEO does) Ramon Armen (U. Michigan freshman) walked into my office about a week later to inquire about LIGO research opportunities Over the next several months, Ramon dug into the DMT infrastructure (especially Patrick Sutton’s EasyCalibrate class) and created StrainBandsMon Bingo!

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 3 StrainBandsMon StrainBandsMon now running online: And documented! Produces status web page Produces minute trends Produces DMT viewer figure of merit

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 4 DMT Viewer Figure of Merit

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 5 Daily summaries Daily summaries (low frequency bands)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 6 Daily summaries (high freq / broad / special bands)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 7 Daily summaries (high freq / broad / special bands) Link to status page Link to documentation page

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 8 SixtyHertzMon (Junyi Zhang) 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 9 Examples (S5 ±3Hz, ±6Hz) 63 Hz 54 Hz 57 Hz 66 Hz

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 10 Examples (S4 120 Hz – short period)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 11 Examples (S4 120 Hz – short period)

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 12 Suspicion: 78.6 = 18.6 Hz sideband on 60 Hz power mains (18.6 hz =beam splitter roll mode resonance) 1)is sharper than 2)  NOT 60 Hz sideband

LIGO-G Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 13 Status Program under active development Has been run on archived S4 & S5 data and on online data (fortress & marble) More infrastructure & documentation needed Plan to incorporate into online production following standard S5 protocol