S2 Bilinear Couplings Study

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Presentation transcript:

S2 Bilinear Couplings Study Vijay Chickarmane, Gabriela González Louisiana State University LSC meeting August 2003 Hannover, Germany LIGO-G030526-00-Z

Bicoherence plane Low frequencies get upconverted by line harmonics: 1.2Hz, 2.1Hz stack modes, vibrational modes of end test masses. A: Low freqs upconverted by 60, 120Hz. B: Features due to coherence between 60, 120 & 180, and the upconverted peaks. C: Due to Optical lever servo oscillations.(harmonics of 46.9Hz) Aug 20, 2003 LIGO-G030526-00-Z

Bilinearity Index trends Integrated bilinearity computed every 16s over 64sec with 0.5 Hz resolution in the f1-f2 plane Large outliers are due to glitches which spread energy over several frequencies! Aug 20, 2003 LIGO-G030526-00-Z

Representative stretches Aug 20, 2003 LIGO-G030526-00-Z

Bilinearity “Glitch” Histograms Low freqs around 60Hz and harmonics (60-60, 60-120) Coupling between calibration line and Optical lever ETMY Analyze the f1-f2 plane for times with large variations in bilinearity trend. Aug 20, 2003 LIGO-G030526-00-Z

Bicoherence Trends Bicoherence computed for 3hrs stretch for several low freqs. Data window of 64s  slide over by 16s. Aug 20, 2003 LIGO-G030526-00-Z

Bicoherence and inspiral triggers Compute Bic with trigger vs Bic without trigger, analyze difference  Which couplings glitched?  Which channels to look at ? Bicoherence analysis of all S2 inspiral triggers with SNR > 10 analyzed, some examples. Results is a text file with the bi-freq glitches. 306 0.00 0.00 306 62.50 60.00 306 119.50 116.00 306 120.00 115.50 306 122.00 2.50 306 122.00 113.50 306 122.50 2.00 306 122.50 2.50 306 122.50 122.00 306 124.00 120.50 306 124.50 120.00 306 235.50 2.00 306 236.00 2.00 306 242.00 2.50 306 242.50 2.00 Aug 20, 2003 LIGO-G030526-00-Z

Looking for the source Demodulate the upconverted frequencies in suspect auxiliary channels. Ex: Plot of the amplitude of the 2.1 Hz line for oplev channels. Look for significant excursion around trigger time. Demodulation involves mixing at a certain freq + low pass filtering(LPF) LPF introduces phase delay, you can use other technique’s to “track” the lines. Ex: Here we use a Kalman Filter to track the 2.1 Hz line. Slight improvement seen. Aug 20, 2003 LIGO-G030526-00-Z

Summary & Conclusions Analyzed Bicoherence of S2 LLO data for science stretches > 4hrs. Computed Bilinearity Index trends, Bilinearity “Glitch” Histograms, Bicoherence Trends. Characterized typical glitches seen as Inspiral triggers, due to upconversion. Need to understand mechanisms of upconversion simulations of detector  experimentally inject signals in seismic channels ect. Veto trigger: Study of trend low frequency peaks ? Aug 20, 2003 LIGO-G030526-00-Z