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Comparison of Pcal with offical calibration

H1 ETMY coil actuation coefficients. Photon calibrator. Actuation coeff. x f^2. Official calibration. Frequency (Hz). Comparison of Pcal with offical calibration. Still seeing 10-15% discrepancies between Pcals and the offical calibration

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Comparison of Pcal with offical calibration

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  1. H1 ETMY coil actuation coefficients Photon calibrator Actuation coeff. x f^2 Official calibration Frequency (Hz) Comparison of Pcal with offical calibration • Still seeing 10-15% discrepancies between Pcals and the offical calibration • Investigating calibration of Pcal output power meas. • Working on estimating other factors in error budgets R. Savage Virgo/Ligo Calibration mtg. May 2007

  2. Accurate measurement of Pcal output power • Until now we have used thermal power meters (Ophir or Scientech) • sensitive to ambient temperature – 6% variations between inside/outside pcal box • absolute calibration suspect at 10% level (Scientech vs. Ophir) • Proposal to use thermally-stabilized InGaAs photodetectors with integrating spheres and absolute calibration at NIST (LIGO-T070094-00-W) • Comparison of photon calibrator results with the official calibration LIGO-T070050-00-W • Status of the LIGO Photon Calibrators: February 2007 LIGO-T070026-00-W R. Savage Virgo/Ligo Calibration mtg. May 2007

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