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An Update of the Fluence Analysis for the 2006 Year

An Update of the Fluence Analysis for the 2006 Year. Doug Rutledge. 1. Baton Rouge April 2006. Photon Field & the mean number of PEs. From Random Walk with Absorption:. ln[Nd]. ln[Nd] is linear in d Slope is -1/ λ attn λ attn is called “ Propagation Length ”

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An Update of the Fluence Analysis for the 2006 Year

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  1. An Update of the Fluence Analysis for the 2006 Year Doug Rutledge 1 Baton Rouge April 2006

  2. Photon Field & the mean number of PEs From Random Walk with Absorption: ln[Nd] • ln[Nd] is linear in d • Slope is -1/λattn • λattnis called “Propagation Length” • cp = 1/λattn called “Propagation Coefficient” d London Collaboration Meeting 2006 Doug Rutledge 2

  3. What is the Fluence Analysis? N = <Num PE's> Ice Properties Doug Rutledge 3 Baton Rouge April 2006

  4. What's New? • Use of the Flasher & Standard Candle Information • Uses data from DOMs below flasher • C tools use weighted Means & errors • Generate final plots • Measure Ice Properties Doug Rutledge 4 Baton Rouge April 2006

  5. New Analysis chain Fat-Reader I3FlashersOnlyFilterPick Fluence-Analysis Within IceTray Root Scripts and C tools Doug Rutledge 5 Baton Rouge April 2006

  6. Completed 2005 (String 21) Analysis 2005 String 21 (fat-reader geom.) Ice Properties data from Kurt W. (just to guide the eye) Doug Rutledge 6 Baton Rouge April 2006

  7. 2006 Data So Far Doug Rutledge 7 Baton Rouge April 2006

  8. 2006 Data • Existing data not entirely suitable • DOMs missing in Occupancy plots • Not enough of it • A lot of data still at pole • Tried Standard Candle data Doug Rutledge 8 Baton Rouge April 2006

  9. Standard Candle Info 40-22 • Standard Candle Info • Data Classes object • Holds info about SC events • Analagous to flasher info • SCInfo Filler module • No SC to DAQ connection • Look for Space-like separated hits in 40-23 & 40-22 • Simple algebra • Find flash time • Depth of SC • Either must be first hit in event • Apply multiplicity cut Standard Candle 40-23 Doug Rutledge 9 Baton Rouge April 2006

  10. Conclusions • Fluence analysis is a study of IceProperties • First IceCube measurement of ice below ~2200 m • 2005 (String 21) analysis complete • 2006 analysis under way, need more data • High statistics => Good Measurement • Does the dust layer move? • Can’t determine this yet

  11. Sigmoid fits • Fluence analysis depends on knowing the “diffusive regime” • Usually 80-200m from source • Dust layers bring regime closer • Tried using occupancy plots to automate diffusive regime determination • Works, but not well • Fit Phit: • 1 – exp(I0 (E/d) exp (-l/d)) Doug Rutledge 11 Baton Rouge April 2006

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