ALLEGRO calibration for the LLO-ALLEGRO stochastic analysis

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Presentation transcript:

ALLEGRO calibration for the LLO-ALLEGRO stochastic analysis Martin McHugh Loyola University New Orleans Stochastic sub-group: S. Bose, S. Heng, W. Johnson, J. Romano, T. Regimbau, J. Whelan, P. Zhang LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LLO - ALLEGRO correlation Good overlap (40 km separation) – sensitive to higher frequency range than LLO-LHO Modulate – rotate to align/misalign/anti-align antenna patterns Another independent detector 40 km apart, explore PEM correlations at intermediate distances LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Outline of technique correlate A1 with L1, equal time stretches Sampling rate very different (250Hz for A1, 2048Hz for L1) A1 data is heterodyned – 250Hz band around ~900Hz match bins in frequency domain resonant nature of the detector means long time constant for excitations in the raw data. Easier to calibrate all of the data and then work with h(t) Store in frames, coordinate with other groups doing h(t) frames LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Signal path LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 xI Bar response R(f) x z[i] Heterodyne and Low-pass F(f) DAQ xQ Feedback damping H(f) LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Calibration determine T[k] F[k] Simple model for bar response (R) track mechanical mode frequencies track mode Q’s (accounts for feedback – (H)) determine overall gain (counts/strain), T and F combined need to get phase shifts not included in mechanical response model (electronic -- F) also need phase of heterodyne reference with respect to overall time standard (gps) Tests indicate we can stitch together strain time series with overlapping stretches LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Calibration line Detector resonances Extra mechanical resonances LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

transducer current changed temperature fluctuations LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Calibration line Extra mechanical resonances LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Calibration pulses in raw and strain time series calibration line off calibration line on calibration pulses LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 Is this calibration good enough? ALLEGRO currently running – same mechanical system as S2, mostly same electronics Allows us to perform some tests to verify model, measure phase shifts Have begun with noise injection measurement done by LSU group LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004

LSC meeting, LIGO Livingston Observatory 18 March, 2004 LIGO-G040138-00-Z LSC meeting, LIGO Livingston Observatory 18 March, 2004