E3 Line Noise Investigation
People
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Bob Coldwell
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Sergey Klimenko
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Soma Mukherjee
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Bernard Whiting
The E3 Line Noise Investigation (LNI) is a continuation of
the LIGO LNI task.
The LIGO LNI task was started with analysis of the E2 data which were used to
characterize the line noise of Hanford 2k interferometer
E2 LNI report..
In the E3 run the Hanford interferometer configuration is essentually the same and no
considerable improvement in the IFO sensitivity is expected. At the same
time the Livingston 4km interferometer is suppose to collect data as will.
It will allow to run a correlation analysis on collected data.
We plan the following work to analyze E3 data:
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Line noise characterization of Livingston 4k Interferometer. Here we plan
to do analysis similar to what we have done for the Hanford 2k interferometer.
It includes measurement of fundamental frequency, strength and classification of
mechanical and environmental resonances.
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Line noise correlation between Hanford and Livingston, mainly for power lines
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Power x-correlation (prelininary)
resources/questions/concerns:
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To estimate line frequency, strength and width we plan to use
Quasi-Monochromatic Line Monitor which has been proven to be very
useful to monitor the E2 data.
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To get a complete picture of the line noise in Livingston we need to process a
considerable amount of data (days). We have two options to process data:
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Run the Line Monitor in Lousiana (as we did for E2 run data)
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Select, compress and bring data for analysis to the LNI investigators.
Typically we use 3-4 16kHz and 8-10 2kHz channels (total bitrate ~300kB/s).
This data can be compressed with the Wavelet Compression Tool that
brings the rate down to 30kB/s. In this case we need to run the Wavelet
Compression Tool in Hanford and Livingston.
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To do the correllation analysis we need to bring data from two sites in one place
(preferably UF) and run the DMT Fourier tool which aslo has to be available at
this place. Currently we don't have the DMT Fourier tool installed in Florida
that could be not trivial to do without help from the DMT experts.
Last update: February 25, 2001
Klimenko Sergey