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Status of the S5 calibration

Status of the S5 calibration. Michael Landry For the Calibration Committee LSC September 2008. Outline. h(f) Status V3 summary. V4 status - improvements. Expectations for S6 calibration. Next talk: Xavier Siemens: h(t) report V3 h(t) - validation, systematics, hardware injections. S6.

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Status of the S5 calibration

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  1. Status of the S5 calibration Michael Landry For the Calibration Committee LSC September 2008 G080469-00-Z

  2. Outline • h(f) Status • V3 summary. • V4 status - improvements. • Expectations for S6 calibration. • Next talk: Xavier Siemens: h(t) report • V3 h(t) - validation, systematics, hardware injections. • S6. G080469-00-Z

  3. V3 h(f) Calibration • Valid throughout S5, from 40-3000 Hz. • Employed in several publications (e.g. Crab, GRB070201, SGR). • DC values from V4 employed in final V3 calibration. G080469-00-Z

  4. Reminder of DC issues • Significant effort has gone into understanding the DC calibrations. • at the outset of S5, DC methods (3) disagreed at the 20% level. • Now, the multiple DC methods agree within the one-sigma error bars of the official method G080469-00-Z

  5. Resultant V3 strains • DC calibration shifts • H1: 7.4%  • H2: 6.2%  • L1: 4%  • High-water BNS marks for S5 shift accordingly to: • H1 15.1 Mpc  • H2 7.3 Mpc  • L1: 15.7 Mpc  G080469-00-Z

  6. V3, V4 OLG Comparisons L1 V3 V4 G080469-00-Z

  7. Epochs Changes in Im() occur due to changes in the detector configuration or time-delay shifts. We see time-delay shifts after front-end reboots. (<30 s) No new epochs for V4 G080469-00-Z

  8. Status of V4 • Many improvements in OLG model, measurement agreement. • Time delay validation by direct measurements • Code mods and bug fixes (Pade approximation, sign error in complex conjugation) • Residuals aid high-frequency agreement • Request from burst group to go to 6.5kHz (as high as we can go, given the butterfly resonance). • L1 models complete, factors being generated. • H1, H2 models nearly done. G080469-00-Z

  9. What’s left? • Finalize H1, H2 models and generate files. • Produce error budget. • Release models for h(t) generation. • Release S5 V4 calibration documents. • Get reviewed. • Publish calibration papers. G080469-00-Z

  10. Expectations for S6 • New sensing scheme will modify the calibration some for S6. Otherwise, propose doing nothing new for this science run. Leverage what was learned in S5. • Have to have photon calibrators running in S6. • Our early calibrations for S5 were accurate at the level of 10% (plus systematics). Expect the same for S6, but with systematics correctly accounted for. • Need access to the machines prior to run in order to obtain h(f) and h(t) for online analyses. • Clearly we need to move to a quicker release of finalized h(t) for searches. • Recruitment of volunteers for h(t) was successful (see following talk), we’re recruiting for h(f). • DAC summit: we’ll ask the search groups, what calibration can they live with. G080469-00-Z

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