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ALLEGRO data during E7 Presenter: Martin McHugh

ALLEGRO data during E7 Presenter: Martin McHugh. Recent/current activities. Stochastic DSO handles both ifo-ifo and bar-ifo cross correlations Frames of E7 data have been made using code written by Ed Daw ALLEGRO undergoing transducer upgrade will NOT take data during S1 aiming for S2.

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ALLEGRO data during E7 Presenter: Martin McHugh

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  1. ALLEGRO data during E7Presenter: Martin McHugh LSC meeting, LIGO Hanford Observatory

  2. Recent/current activities • Stochastic DSO handles both ifo-ifo and bar-ifo cross correlations • Frames of E7 data have been made using code written by Ed Daw • ALLEGRO undergoing transducer upgrade • will NOT take data during S1 • aiming for S2 LSC meeting, LIGO Hanford Observatory

  3. Complications • Heterodyning – bar data is in-phase and quadrature output of a lock-in amplifier with reference frequency 907 Hz • sampling rate – 250Hz • dynamic range – raw output is 2 sharp lines at the bar resonant frequencies LSC meeting, LIGO Hanford Observatory

  4. Bar–ifo Stochastic Analysis Chain • Bar: • Whiten data (response function alone leaves spectrum with big ‘dips’) – frequency domain or time domain ? • Form response – de-whitening function • Two-sided psd of result • Pass data to DSO LSC meeting, LIGO Hanford Observatory

  5. Interferometer: • mix with reference of appropriate frequency (907Hz) and phase • resample complex times series 16384Hz to 250Hz • take 2-sided psd • pass data to DSO LSC meeting, LIGO Hanford Observatory

  6. Extra mechanical resonance Detector resonaces Calibration line Power line harmonic LSC meeting, LIGO Hanford Observatory

  7. LSC meeting, LIGO Hanford Observatory

  8. LSC meeting, LIGO Hanford Observatory

  9. LSC meeting, LIGO Hanford Observatory

  10. Questions • Rotating the bar between X-arm alignment and Y-arm alignment flips the sign of the GW correlation – allows cancellation of correlated noise • Null orientation gives measure of correlated noise • What’s the optimal amount of time in each of these orientations? LSC meeting, LIGO Hanford Observatory

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