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IFO review

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IFO review

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  1. LIGO calibration during the S3 science runMichael Landry LIGO Hanford ObservatoryJustin Garofoli, Luca Matone, Hugh Radkins (LHO), Rana Adhikari, Peter Fritschel (MIT), Patrick Sutton (Caltech), Brian O’Reilly (LLO), Xavier Siemens (UWM), Gabriela González,Andres Rodriguez (LSU), Martin Hewitson (GEO)GWDAW9December 19, 2004Annecy, France

  2. IFO review

  3. H1

  4. News on calibrationsince Aug LSC meeting Not enough!… • Coefficients: validation studies of “new” method (using demodulated line) • Models: • Codes were succesfully reviewed (P. Fritschel), no errors found. • V2 model version reviewed; V3 mods will need to be assessed • Work in progress on LHO models (to incorporate hardware/digital filters) • Work in progress: systematic model/measurement comparison for different calibration runs in L1. • Validation (use of!) X. Siemen’s h(t) frames has started…

  5. Hardware measurements

  6. S3 V3 a,b coefficients • V2 (from P. Sutton’s SenseMon) • b from SenseMon averaging input matrix • a from SenseMon’s line amp, b, and G0(f0) • V3: use Xavier Siemens’s code to generate demodulated lines in ASQ, DARM, EXC • Complex b = ( 1/D0)*(DARM-EXC)/ASQ • Complex a = -(D0/G0)*ASQ/DARM • Complex ab = -(1/G0)*(DARM-EXC)/DARM • Non-zero mean of imaginary part indicates errors in reference functions D0,G0 (at cal freq). • Standard deviations of imaginary parts are error estimates in real part (and depend on sampling frequency). • Compare consistency of Xavi’s output and existing model

  7. Magnitude: Phase: Contributions to the Error R(fi,t) = 1 + a(t) b (t) G(fi) a(t) C(fi)

  8. “New” method: validation steps H1, reference time G0 phase “error”:1.5 deg

  9. S3 V3 ab coefficient: H1

  10. S3 V3 ab coefficient: L1

  11. S3 V3 a,b coefficients: H1 Over all of S3: a variation: 4% ab variation: 1% Error: 0.3%

  12. S3 V3 a,b coefficients: L1 Over all of S3: a variation: 15% ab variation: 4% Error: 0.5%

  13. S3 Calibration errors • Errors from reference models in S3 ~ errors in S2 (5-10%) • Random variations, errors in alpha, beta (60 sec integration time): In S2: 0.7% (L1), ~3% (H1, H2).

  14. Conclusions • V3 almost ready, should be released in ~2 weeks. • Will include calibration for science times, and times of hardware injections. • M5 used a circa S3 calibration, E11 will use a fully updated one • S4: • Will use same methods at LLO, LHO for DC measurements, maybe including new methods (DC calibration=largest source of error) • Will have models, “good” reference measurements BEFORE run starts… • On-line calibration (P. Sutton) • Will have ~real time comparisons of different methods for calibration coefficients • Photon calibrators in place for cross check

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