Download - March 02, 20111 1 Shahid Hussain for the ICECUBE collaboration University of Delaware, USA
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March 02, 2011 11
Shahid Hussain for the ICECUBE collaboration
University of Delaware, USA
COSMIC RAY PHYSICSWITH ICECUBE
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125 m
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Outline
Cosmic rays ICECUBE Cosmic ray measurements with ICECUBE
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cosmic rays Produce air showersRadiation from space discovered by
Victor Hess (1912)
Direct/indirect detection Direction, spectrum, composition
Physics questions– Sources? – Acceleration mechanism?
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Hillas plotAstrophysical objects:Magnetic field vs. object size
Cosmic ray sources?
Transparency of the Universe:Particle energy vs. Object distance
P. Gorham
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Air showers-- detection methods
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ICECUBE
Detection principle: optical Cherenkov radiation Detector medium: South Pole ice Physics
– Neutrinos: Main discovery target is astrophysical neutrinos – Cosmic rays (~100 TeV to ~1 EeV)– Dark matter (indirect search)– Monopoles and other exotic particles– Cross sections (neutrino-nucleon, air showers)
Animations:– ICECUBE geometry Downward event Upward event
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ICECUBE: 3D view
Ice properties measured with LED and LASER sources
Average optical parameters at 400 nm:
λabs ~110 m, λsca ~20 m above the dust layer
λabs ~220 m, λsca ~40 m below the dust layer
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ICECUBE- top view
DOMs in a Tank Digital optical module (DOM)
IceTop Tank
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10Tilo W.
250ns
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Event example: June 2010 data
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direction 1.5°
core 9 m
energy 0.06 (in log10)
Fabian et al
IceTop-only (26 stations) analysis example
Effective area and resolution
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Example of an InIce-only analysis
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Several analyses underway:Combine surface and InIce information
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Simulations: correlation between surface and InIce energy deposition; sensitivity to composition.
Composition analysis Analyze small showers for
comparison with direct measurements
Search for PeV gamma rays Search for Muons with large
transverse momentum
patrick
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Summary– ICECUBE as a cosmic ray observatory
ICECUBE is now fully deployed; data analyses underway Energy range covered ~100 TeV-1 EeV
– Overlap with direct measurements – Main goal is to understand galactic to extra-galactic transition region
Energy estimation– em and mu components with IceTop– Muon component InIce
Direction measurement – both IceTop and InIce
Cosmic ray composition resolution– Combined information from IceTop, InIce, and angular distribution of
events
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Extra slides
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Event reconstruction (IceTop only):Likelihood function
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Charge likelihood function:
Time likelihood function:
toprec likelihood function:
L0 involves:
Lateral distribution function
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18Tilo W.
f
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VEM definition and DOM Calibration
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DOM
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DOM launch rates due to air showers
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HG
LG
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Air showers– longitudinal profiles
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Jaime Alvarez-Mu˜niz et al 2002
Todor 2008
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Lateral profile of air shower signals measured with IceTop
10 PeV proton simulation10 PeV iron simulation
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Tilo
IceTop-only (26 stations) analysis example