Flasher reconstruction at LBNL

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Flasher reconstruction at LBNL

• Dima Chirkin

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Photon detection
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Residual time description
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Pandel log likelihood
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Pandel log likelihood
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Convoluted Pandel
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Ice description
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Ice description
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Ice description
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Reconstruction in fat-reader

• fat-reader contains a plug-in reconstruction
  module, which
• uses convoluted pandel description
• uses multi-media propagation coefficients
• relies on the Kurts 6-parameter ice model
• has Klauss stability of the solution
• parameterization is possible for bulk ice
• reconstructs both tracks and showers/flashers
• calculates an energy estimate
• also reconstructs IceTop showers

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Flasher analysis of April 9 data
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Flasher analysis of April 9 data
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Flasher analysis of July 12 data
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Energy reconstruction
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Flasher energy reconstruction
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Flasher intensity variations (in progress)
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Flasher energy estimate
Quantum efficiency 0.24
PMT area 492.10 cm2
Energy 5.08 TeV
Cascade 1.37 105 photons/GeV
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Conclusions

• In-ice track and cascade position and energy
  reconstruction algorithms have been implemented
  in a module of the fat-reader.
• Flasher position reconstruction works very well
• Despite a very early state of the energy
  reconstruction, results are encouraging.

Outlook

• only rough optimization of the llh parameters
  was performed, need to refine. Kurts ice model
  has been extended to all IceCube depths, will
  need to rerun reconstruction with new tables
• detailed measurement of scattering coefficients
  with the string
• IceTray implementation and further improvements,
  e.g., multiple coincident event reconstruction
  (by Jon Aytac)