The IceCube project and its EHE capability

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)


OutlineOutline


The IceCube DetectorThe IceCube Detector

IceTop

AMANDA

2450m

1450m

Digital Optical Module


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


GZK Neutrino and BeyondGZK Neutrino and Beyond

GZK neutrinoGZK neutrino

Beyond the Standard ModelBeyond the Standard Model


EExtremely xtremely HHigh igh EEnergy nergy Neutrino TargetsNeutrino Targets


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


EHE Events in IceEHE Events in Ice

EGZK >> EAtm

GZK neutrino induced lepton and atmospheric muon fluxes at the IceCube depth


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-


Muon EventsMuon Events

9 EeV100 TeV


MC SetupMC Setup

Benchmarking modelsBenchmarking modelsGZK muons and tau signalsGZK muons and tau signalsAtmospheric muon backgroundAtmospheric muon background


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


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


GZK Atmospheric GZK

NPE DistributionsNPE Distributions


Zenith DistributionsZenith Distributions

GZKGZK

Atmospheric

Zenith angle

up down


Signal CutsSignal Cuts

GZK Atmospheric


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


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


Effective AreaEffective Area

80 strings

up-goinghorizontaldown-going

108 GeVup-goinghorizontaldown-going

1010 GeV

9 S

80 S


Energy CalibrationEnergy Calibration

AbsoluteAbsolutelyly calibrated calibrated photon sourcephoton source (standard-(standard-candle) candle) and and

rreceeceiiversvers (golden-dom)(golden-dom)

SCs40

GDs39


Standard CandleStandard Candle


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


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


Extra slidsExtra slids



Timing/GeometryTiming/Geometry

In-ice in-DOM flasherIn-ice in-DOM flasher


Effective Area 9 strings and Effective Area 9 strings and moremore

up-goinghorizontaldown-going


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


The IceCube collaborationThe IceCube collaboration

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The IceCube project and its EHE capability

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