IceTop reconstruction with rime (an update)

Dmitry Chirkin, LBNL

Improvements/updates to code

• a number of bug fixes

• refactored and optimized reconstruction code

• particle density fluctuations are now distributed log-normally. This leads to a self-consistent description of fluctuations (previously density fluctuations had to be rescaled to yield reasonable results)

• a new SAF (Stefan Arne Fabian) parameterization of density term is implemented. A new parameter describes the curvature of the particle density growth with distance and may turn out to be useful to separate photonic from ionic showers.

Shower profiles

DOM distance profile

Lateral profile

Lateral profile (normalized)

IceTop – in-ice coincidence plots

Summary

• IceTop reconstruction in rime is quite mature. It includes the latest LDF function and other developments

• It handles geometrical (shower front fit) reconstruction and LDF fit in one symmetric step, treating both as respective contributions to the llh function

• several bugs were found and fixed; the code was somewhat refactored and optimized.