Update on LLO-ALLEGRO stochastic analysis

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Presentation transcript:

Update on LLO-ALLEGRO stochastic analysis Martin McHugh Loyola University New Orleans LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

Motivation for pursuing LLO - ALLEGRO correlation Good overlap (40 km separation) – sensitive to higher frequency range than LLO-LHO Modulate the signal – rotate to align/misalign/anti-align antenna patterns * Another independent detector 40 km apart, explore PEM correlations at intermediate distances *Modulating the experimental signature of a stochastic gravitational wave background, Lee Samuel Finn and Albert Lazzarini Phys. Rev. D 64, 082002 (2001) xxx.lanl.gov/abs/gr-qc/0104040 LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

ALLEGRO during S2—243hrs coincident with LLO Orientation GPS UTC Null alignment (63o W of N) 731716133-732132263 732153628-732747448 732758424-732909594 14-Mar-2003 22:28:40- 19-Mar-2003 18:04:10 20-Mar-2003 00:00:15- 26-Mar-2003 20:57:15 27-Mar-2003 00:00:11- 28-Mar-2003 17:59:41 Aligned with Y-arm (18o W of N) 732935836-733198936 733450252-733779682 733813685-733960813 29-Mar-2003 01:17:03- 01-Apr-2003 02:22:03 04-Apr-2003 00:10:39- 07-Apr-2003 19:41:09 08-Apr-2003 05:07:52- 09-Apr-2003 22:00:00 Aligned with X-arm (62o E of N) 733964413-734378555 09-Apr-2003 23:00:00 – 14-Apr-2003 18:02:22 LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 Calibration line Extra mechanical resonances LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

Expected S2 sensitivity Over 2Hz around 917Hz ALLEGRO strain LLO strain for 240 hrs of data LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 Issues Heterodyning – bar data is in-phase and quadrature output of a lock-in amplifier with reference frequency (899 Hz for S2) sampling rate – 250Hz frequency resolution and dynamic range – raw output is 2 sharp lines at the bar resonant frequencies Data preparation/cleaning LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 Calibration line Detector resonances Extra mechanical resonances LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 Bar–Ifo Stochastic Analysis Chain Calibrate bar data (freq domain) to get h(t) time series (250 Hz), store in frames – eliminates sharp spectral features that require high resolution Decimate ifo data to 2048Hz Cross-correlation in frequency domain – bar reference frequency an integer number of Hz (899 for S2) so frequency bins line up LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

Recent/current activities Calibration Frames of S2 data have been made SimulateSB module of inject package modified to do simulations for bar-ifo analysis ALLEGRO installed new calibrator, fixed many leaks, aiming to take data for second half of S3 LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003

LSC meeting, LIGO Hanford Observatory 12 November, 2003 Calibration calibration pulse method too noisy Response function model Need 4 numbers, 2 mode freqs, gain and phase Tests indicate we can stitch together strain time series with overlapping stretches Tukey windowing? LIGO-G030589-00-Z LSC meeting, LIGO Hanford Observatory 12 November, 2003