Samvel Ter-Antonyan and Ali Fazely for ICECUBE,  COSMIC-RAY GROUP
Southern University, Baton Rouge

samvel_terantonyan@subr.edu

    OBJECTIVES
  • Simulation of DOM calibration
  • Tank-Signal fluctuations, tank-to-tank and tank-to-fit analysis
  • Reconstruction of shower parameters using a semianalytic Chi^2 method
  • Investigation of shower reconstruction errors and selection criteria
  • Multiparametric primary energy evaluation method regardless of primary nuclei
  • Inverse problem solution taking into account reconstruction uncertainties and energy threshold
  • Reconstruction of all particle primary energy spectrum


    CURRENT RESULTS
  • IceTop Internal Report: icecube/201208001-v2
    "Alternative methods of shower parameters reconstruction and unfolding of
    all-particle primary energy spectrum for IceTop"
  • Strategy of simulations, methods and preliminary data (2009, Madison Meeting)  
  • Alternative method of ICETOP data processing (2010, Annapolis Meeting)  
  • Primary energy evaluation method and all particle energy spectrum reconstruction (2010, Annapolis Meeting)  
  • Outlook on tank-signal fluctuations (2010)  

GRAPHICAL SURVEY OF CURRENT RESULTS


Simulated and reconstructed shower core position distributions for ICETOP array. Red symbols show the ICETOP tank locations.


Combined shower selection criteron.


Shower parameter reconstruction accuracies


True (E0) and estimated (E1) energy scatter plots for different primary nuclei.


Evaluated energy biases depending on shower zenith angle


Distributions of errors of energy evaluation for primary Fe and H nuclei.


Shower detection (and reconstruction) efficiency for different primary nuclei.


Bias (upper panel) and RMSD (lower panel) of energy evaluation.


Spectral errors of inverse problem solution.


Examples ofreconstructions of shower lateral distribution functions for different energies and primary nuclei.


Tank-To-Tank-signal fluctuations.


Tank-To-Fit-signal fluctuations.


Tank-signal callibration for shower simulations.


Reconstructed all-particle primary energy spectrum for mixed composition.

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Last update 12.23.10