CORSIKA bug and other updates
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Transcript of CORSIKA bug and other updates
CORSIKA bug and other updates
Dmitry Chirkin UC Berkeley
CORSIKA updates
• Track times are given relative to the shower core arrival to the surface
• F2k and related fixes: track numbers and parent ids (treated by ucr), p->Z1
• All coordinates are given at the observation level (ice surface), track length now exact
• Shower times can now be assigned and coincident showers can be treated (by combining them within a predefined time window)
CORSIKA bug
• CORSIKA version 6.023 and earlier had muon radiative energy losses underestimated by 103. As of version 6.030 this is corrected. Effect on the background calculation is minor.
Nch distributions
• To estimate the differences between different CORSIKA versions and CR spectrum models, and effect of the coincident showers on the background simulation, Nch distributions are compared.
Spectrum index corrections
• results
1st method
2nd method
CORSIKA updates (continued)
• Possible to choose between Wiebel-Sooth and Jorg Horandel published primary spectra. The latter is implemented within the poli-gonato model of the CR energy spectrum. This implementation is now valid up to 50 PeV
Poli-gonato CR spectrum fits
• From J-H
Conclusions
• Many updates to CORSIKA were implemented• CORSIKA bug is corrected in current version
(6.030) and has no effect on the background muon simulation
• Coincident shower events do not significantly affect the background simulation
• Change from Wiebel-Sooth CR spectra to the Jorg Horandel poli-gonato model does affect the background simulation, the change in spectral index is of the order 0.02
Auxiliary slides
• Spectrum correction depth profiles
Spectrum corrections method
• Also my spectrum corrections method was applied
1st method
2nd method