S2 and S3 Correlation Studies Nelson Christensen Sarah Vigeland Physics and Astronomy Carleton College Detector Characterization Session LSC Meeting August.

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Presentation transcript:

S2 and S3 Correlation Studies Nelson Christensen Sarah Vigeland Physics and Astronomy Carleton College Detector Characterization Session LSC Meeting August 19, 2004 LIGO-G Z

A Usefulness for LSC Meetings ● S2-S3 Correlation study presented at March 2004 LSC meeting: see G Z ● Feedback from the talk: It could be very useful to have a catalog of observed and known correlations with AS_Q. ● Especially useful for CW search

S2-S3 Correlation Catalog ● Webpage based catalog of correlations ● ● LSC-AS_Q Correlations with PEMs ● S3 and S3: H1, H2, L1 ● Correlations ordered by channel, and also by frequency ● Formats: html and txt ● Columns are: Channel Frequency(Hz) Height Width(Hz)

S2 S3 Correlation Measurements ● 200 averages ● 0.01 Hz Bandwidth ● Threshold of detection is correlation of 0.05 ● Lowest frequency (for now) reported in 50 Hz ● Measurements made by undergradMon ● Examples of how values were determined are given ● Histograms of number of occurrences vs. correlation height also given ● Exclude 60 Hz and harmonics

Within this range, we found three peaks - one at Hz with a maximum correlation height of and a width of 0.15 Hz, one at Hz with a maximum correlation height of 0.26 and a width of 0.3 Hz, and one at Hz with a maximum correlation height of and a width of 0.1 Hz.

Example of histogram of correlation height distribution

Hunting for Unknown Correlations ● 250 Hz mystery line: S2 LHO noise seen in CW and stochastic analysis ● ● 250 Hz correlations with H1:LSC-AS_Q and H2:LSC- AS_Q seen in H0:PEM-HAM3_ACC, HAM9_ACC, HAM7_MIC, HAM8_MIC, HAM10_MIC ● Szabi's List

Correlation around 250 Hz gone in S3

We are always ready and happy to respond to identification of unknown noise sources. Szabi's List H2S3H0:PEM-RADIO_LVEA ( ) H0:PEM-RADIO_LVEA ( ) H0:PEM-RADIO_LVEA119.2 ( ) H0:PEM-LVEA_MIC ( ) H0:PEM-RADIO_LVEA ( ) H0:PEM-ISCT10_MIC ( ) HO:PEM-RADIO_LVEA ( ) H0:PEM-LVEA_MAGZ ( ) H0:PEM-BSC10_MIC ( ) H1S2H0:PEM-HAM8_MIC72 ( )0.44 H0:PEM-HAM7_MIC72 ( )0.338 H0:PEM-HAM10_MIC143 ( ) H0:PEM-PSL1_MIC192 ( ) H0:PEM-HAM8_MIC192 ( ) H0:PEM-HAM7_MIC192 ( )0.25 H0:PEM-PSL1_MIC ( )0.121 H1S3none

H1 H2 Correlations The immediate emphasis of our correlation studies will be common noise in H1 and H2. Look for long time correlations, and also coincident “bursts” of noise.

Examples of Common H1 and H2 Correlations ● H0:PEM-ISCT4_MIC59.28 Hz ● H0:PEM-ISCT1_MIC105 Hz ● H0:PEM-PSL1_MIC Hz, 216 Hz ● H0:PEM-LVEA_MIC266.3 Hz

Example of H1- H2 Correlation and H1:LSC-AS_Q power spectral density

Big Seismic Events at LHO Same event, but different filters on H0:PEM-LVEA_SEISZ