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IceCube: initial performance. Deployment during austral summer 04-05 Reconstruction of digital waveforms Time calibration Detector verification with flashers Muon reconstruction Timing verification with muons Coincident muon – IceTop shower events. Dmitry Chirkin, LBNL.
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IceCube: initial performance • Deployment during austral summer 04-05 • Reconstruction of digital waveforms • Time calibration • Detector verification with flashers • Muon reconstruction • Timing verification with muons • Coincident muon – IceTop shower events Dmitry Chirkin, LBNL for the IceCube collaboration
IceCube introduction Deep ice array IceCube • Digital readout technology • 80 strings / 60 DOMs each • 17 m DOM spacing • 125 m between strings • hexagonal pattern over 1 km2x1 km
6 The first muon – IceTop shower coincident event January 23 First runs with the four IceTop stations (8 tanks) taken January 29 1:31 NZT First IceCube string deployed February 9 First shower/muon coincidence events found
for 76 DOMs In-ice DOMs IceTop Time Calibration
Muon time calibration verification • reconstruct muon tracks without DOM X • plot the time residual for DOM X for nearby reconstructed tracks • if scattering length is longer than the distance cut (10 m) the most likely residual should be 0, otherwise residual will show delay increasing with the amount of scattering.
Summary • The first IceCube string and four IceTop stations were deployed last austral summer; analysis began after freeze-in. • The ability to reconstruct muons and air showers, and to detect muons coincident with air showers was demonstrated • The observed muon flux is consistent with the expectation from the simulation • The overall detector timing uncertainty was measured to be below ~3 ns • The first elements of the IceCube detector perform as expected, or better. • Deployment of up to 10 IceCube strings and 20 IceTop tanks is scheduled for the coming season.
