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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

Status of the S5 calibration

Michael Landry

For the Calibration Committee

LSC September 2008

G080469-00-Z

outline
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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v3 h f calibration
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.

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reminder of dc issues
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

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resultant v3 strains
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 

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epochs
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

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status of v4
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.

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what s left
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.

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expectations for s6
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.

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