LIGO-G060410-00-Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 StrainBandsMon...
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Transcript of LIGO-G060410-00-Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 StrainBandsMon...
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 1LIGO-G060410-00-Z
StrainBandsMon and SixtyHertzMon
Keith Riles (University of Michigan)
(for Ramon Armen & Junyi Zhang)
LIGO Scientific Collaboration MeetingLSU – August 16, 2006
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 2LIGO-G060410-00-Z
StrainBandsMon(Ramon Armen)
E-mail 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!
![Page 3: LIGO-G060410-00-Z Detchar Introduction (8/16/06)K. Riles - University of Michigan 1 StrainBandsMon and SixtyHertzMon Keith Riles (University of Michigan)](https://reader035.fdocuments.in/reader035/viewer/2022062408/56649f325503460f94c4e24b/html5/thumbnails/3.jpg)
Detchar Introduction (8/16/06) K. Riles - University of Michigan 3LIGO-G060410-00-Z
StrainBandsMon
StrainBandsMon now running online:
And documented!
Produces status web page
Produces minute trends
Produces DMT viewer figure of merit
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 4LIGO-G060410-00-Z
DMT Viewer Figure of Merit
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 5LIGO-G060410-00-Z
Daily summaries(low frequency bands)
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 6LIGO-G060410-00-Z
Daily summaries(high freq / broad / special bands)
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 7LIGO-G060410-00-Z
Daily summaries(high freq / broad / special bands)
Link to status page
Link to documentation page
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 8LIGO-G060410-00-Z
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
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 9LIGO-G060410-00-Z
Examples(S5 ±3Hz, ±6Hz)
63 Hz
54 Hz57 Hz
66 Hz
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 10LIGO-G060410-00-Z
Examples(S4 120 Hz – short period)
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 11LIGO-G060410-00-Z
Examples(S4 120 Hz – short period)
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 12LIGO-G060410-00-Z
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
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Detchar Introduction (8/16/06) K. Riles - University of Michigan 13LIGO-G060410-00-Z
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