IceTop – string 21 coincidences. Dmitry Chirkin, LBNL. Presented by Tom McCauley. Coincidence timing test. leading edge time t hit of string 21 DOMs 1, 26, 56 (with t IceTop = 0 ). Depth (km / m s). 0 / 0. 1.45 / 4.8. DOM 1. 1.88 / 6.3. DOM 26. 2.39 / 7.9. DOM 56. 39. 30. 29. 21.
Dmitry Chirkin, LBNL
Presented by Tom McCauley
leading edge time thit of string 21 DOMs 1, 26, 56 (with tIceTop = 0 )
Depth (km / ms)
0 / 0
1.45 / 4.8
1.88 / 6.3
2.39 / 7.9
From ICRC presentation by Tom Gaisser
Fat-reader can be used to extract coincident in-ice/IceTop events (mode=4 mmin=2), to save them into a .hit-format file (-f) and to reconstruct both in-ice muon (rmsk&1) and IceTop shower (rmsk&4).
IceTop waveform feature-extracted parameters are leading edge and charge. Two ways of combining ATWD waveforms are implemented: combined (dsat=0) or highest unsaturated (dsat=1).
The more vertical zenith angle of the reconstructed muons could be due to the shower curvature:
Since the muon passes close to the string at depth, the shower core (which is close to penetrating muon) is far from the IceTop array, i.e. IceTop sees the curved part of the shower.
The angle difference should be proportional to the zenith angle if this is the case.