LIGO-G010315-00-Z E4 Correlations: Detector Characterization Nelson Christensen Carleton College August 15, 2001.

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Presentation transcript:

LIGO-G Z E4 Correlations: Detector Characterization Nelson Christensen Carleton College August 15, 2001

LIGO-G Z E4 Correlations Detector Characterization Nelson Christensen Adrian Ottewill Steve Penn

LIGO-G Z Adrian’s DMT Program CorrMon – New features Specify a correlation threshold value Trigger is generated when threshold exceeded Correlation value and frequency reported.

LIGO-G Z

E4 Correlation Applications Upper Limits Applications Inspiral UL: Correlations as a tool for veto determination. Stochastic Background UL: PEM Intersite Correlations

LIGO-G Z Inspiral UL Study CorrMon with E4 data: LLO L1:LSC-AS_Q Interferometer Out L1:IOO-MC_FMode Cleaner L0:PEM-BSC5_ACCZ Accelerometer –1 PEM Channel to simplify study of developing vetoes

LIGO-G Z IUL Study Also use NonMon (DMT) – looks for correlated glitches – Jacob Fenton, Reed College A. Rizzi’s chirp detector (GRASP) –Concentrated on 900 s of “locked” LLO data, and 3 tools detected simultaneous interferometer and accelerometer events.

LIGO-G Z NonMon

LIGO-G Z CorrMon 900 seconds Interferometer and accelerometer Calculate correlations for T=9s Trigger when correlation>50%

LIGO-G Z

Stochastic UL Intersite Correlation studies Magnetometers primary focus. See correlations at 70 Hz (computer monitors) Also correlations at 16 Hz and harmonics (DAQ Buffering rates???)

LIGO-G Z Eliminate powers of s of data per correlation, but averaged 7 times (341x7 = 2387 s) Frequency bins averaged over 55 bins Hanning window applied

LIGO-G Z

LLO-LHO Correlations – Lightning(?) Some simultaneous events observed in LHO and LLO coils. Will examine these events as well. Use CorrMon and NonMon

LIGO-G Z Steve Penn – Bilinear Couplings See Penn’s report