The IceCube project and its EHE capability
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CRIS06 - June 1st, 2006CRIS06 - June 1st, 2006 11
The IceCube projectThe IceCube projectand its EHE capabilityand its EHE capability
Aya IshiharaUniversity of Wisconsin – Madison
(for the IceCube collaboration)
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OutlineOutline
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The IceCube DetectorThe IceCube Detector
IceTop
AMANDA
2450m
1450m
Digital Optical Module
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This year’s strings This year’s strings
AMANDA
9 strings and 16 ice-top station have been deployed
Toward 80 string km3 detector
and moreand more
~125m
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GZK Neutrino and BeyondGZK Neutrino and Beyond
GZK neutrinoGZK neutrino
Beyond the Standard ModelBeyond the Standard Model
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EExtremely xtremely HHigh igh EEnergy nergy Neutrino TargetsNeutrino Targets
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EHE Events in the EarthEHE Events in the Earth
Generally upgoing events are selected
Earth is opaque for EHE neutrino
EHE neutrino events are mostly down-going
NOT up-going
North
North
down-going
up-goingup-going < 1PeV > PeV
EHE
CR
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EHE Events in IceEHE Events in Ice
EGZK >> EAtm
GZK neutrino induced lepton and atmospheric muon fluxes at the IceCube depth
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EHE Events with the EHE Events with the IceCubeIceCube
Muon energy losses by radiation Muon energy losses by radiation cascading dE/dx propto Ecascading dE/dx propto E
e+e-
pair-creation
bremsstrahlung
photo-nuclear
e+e-
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Muon EventsMuon Events
9 EeV100 TeV
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MC SetupMC Setup
Benchmarking modelsBenchmarking modelsGZK muons and tau signalsGZK muons and tau signalsAtmospheric muon backgroundAtmospheric muon background
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NPENPE Explain Waveforms and NPE just an integral of all the arrival phot-electronExplain Waveforms and NPE just an integral of all the arrival phot-electron In-ice particle energy dependent, No timing/geometrical informationIn-ice particle energy dependent, No timing/geometrical information
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Another factor to NPEAnother factor to NPE
Events with the same energy ~ 30PeV
containedcontainedHigh npe: 10^7 npe High npe: 10^7 npe
uncontaineduncontainedLow npe: 1000 npeLow npe: 1000 npe
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GZK Atmospheric GZK
NPE DistributionsNPE Distributions
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Zenith DistributionsZenith Distributions
GZKGZK
Atmospheric
Zenith angle
up down
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Signal CutsSignal Cuts
GZK Atmospheric
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Event Rate 80 stringsEvent Rate 80 strings
GZK 3.5 events/year
GZK 0.56events/year
Atmospheric 0.33 events/year
GZKGZK
Atmospheric
GZKGZK
Atmospheric
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Event Rate 9 strings and moreEvent Rate 9 strings and more With the same cut for With the same cut for
all the string numbersall the string numbers GZKAtmospheric
string numbers
920406080
GZK
Atmospheric
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Effective AreaEffective Area
80 strings
up-goinghorizontaldown-going
108 GeVup-goinghorizontaldown-going
1010 GeV
9 S
80 S
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Energy CalibrationEnergy Calibration
AbsoluteAbsolutelyly calibrated calibrated photon sourcephoton source (standard-(standard-candle) candle) and and
rreceeceiiversvers (golden-dom)(golden-dom)
SCs40
GDs39
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Standard CandleStandard Candle
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IceTop: Background TaggingIceTop: Background Tagging Major background is atmospheric muon of Major background is atmospheric muon of
which in-ice nature still unknown at this which in-ice nature still unknown at this regimeregime
Tagging on the surface muons with Tagging on the surface muons with surface array for an additional informationsurface array for an additional information
EHE CR
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Conclusion -outlook-Conclusion -outlook-
IceCube is capable of EHE and the IceCube is capable of EHE and the capability is glowing year-by-year capability is glowing year-by-year
EHE event selection can be done only using EHE event selection can be done only using amount of photon emitted / receivedamount of photon emitted / received
For reconstruction of further uncontained For reconstruction of further uncontained events, energy/geo, more sophisticated events, energy/geo, more sophisticated methods using information of photon methods using information of photon propagation in ice, e.g. arrival timings, propagation in ice, e.g. arrival timings, geometrical distributions reflected in geometrical distributions reflected in waveformswaveforms
subsystemssubsystems
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Extra slidsExtra slids
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Timing/GeometryTiming/Geometry
In-ice in-DOM flasherIn-ice in-DOM flasher
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Effective Area 9 strings and Effective Area 9 strings and moremore
up-goinghorizontaldown-going
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3km deep ice at South Pole3km deep ice at South Polevery clear below 1450m depthvery clear below 1450m depth
IceCubeunder construction
AMANDA-IICompleted in 2000
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The IceCube collaborationThe IceCube collaboration