LIGO-G020366-00-Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 1 ALLEGRO data during E7 Presenter: Martin McHugh Orientation GPS UTC IGEC alignment.

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Presentation transcript:

LIGO-G Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 1 ALLEGRO data during E7 Presenter: Martin McHugh Orientation GPS UTC IGEC alignment (48 o CCW from N) – – Jan :46: Jan :00:19 08-Jan :00: Jan :41:18 Aligned with Y-arm (18 o CCW from N) Jan :41: Jan :44:18 Null alignment (63 o CCW from N) Jan :44: Jan :15:50

LIGO-G Z 20 August, 2002 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

LIGO-G Z 20 August, 2002 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

LIGO-G Z 20 August, 2002 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

LIGO-G Z 20 August, 2002 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

LIGO-G Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 6 Calibration line Detector resonaces Power line harmonic Extra mechanical resonance

LIGO-G Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 7

LIGO-G Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 8

LIGO-G Z 20 August, 2002 LSC meeting, LIGO Hanford Observatory 9

LIGO-G Z 20 August, 2002 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?