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IceTop and IceCube. IceTop is the surface component of IceCube. Tom Gaisser. IceCube with IceTop makes a 3-dimensional air shower array. IceTop: Elevation 3000 m.a.s.l. (700 g/cm 2 ) Calibration: pointing; Dq/q; E-deposition

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icetop and icecube

IceTop and IceCube

IceTop is the surface component of IceCube

Tom Gaisser

icecube with icetop makes a 3 dimensional air shower array
IceCube with IceTop makes a 3-dimensional air shower array

IceTop: Elevation 3000 m.a.s.l. (700 g/cm2)

  • Calibration: pointing; Dq/q; E-deposition
  • Tag background for tuning reconstruction and rejection algorithms in n-telescope
  • Cosmic-ray composition with coincident events
    • Use ratio of Nm in deep ice (Em > 0.4 TeV) to size at surface
    • Primary energy range: 3 x 1014 – 1018 eV
    • ‘knee’ to ‘ankle’ = galactic to extragalactic?
icetop station
IceTop station
  • Two Ice Tanks 2.7 m2 x 0.9 m deep
  • Coincidence between tanks = potential air shower
  • Local coincidence with no hit at neighboring station tags small showers with single muon in deep detector
  • Signal in single tank = m, g or e for monitoring, calibration of tanks
  • Low Gain/High Gain operation to achieve dynamic range
slide7

IceCube with IceTop

after 04/05 deployment season

4 IceTop Stations deployed in December 2004

1st IceCube string deployed on Jan 29 2005

shower spectrum
Shower spectrum

Spectrum of total charge

deposited in 8 tanks

of area 2.7 m2 per tank

( 1 PE ~ 0.8 MeV ;

1 VEM ~ 0.16 GeV )

plan for 2006

74

67

66

59

58

57

50

49

47

48

40

39

38

30

29

21

Plan for 2006

12 new stations planned for 2006 (red)

Will give a total area of 0.12 km2

10 new IceCube strings planned

  • Cosmic-ray showers 3.1014 -1017 eV
    • Total rate of > 4-fold EAS: ~ 4 Hz
    • ~100 / day > 1016 eV (~50 m @ 2 km)
    • ~ 1 / day > 1017 eV (~300 m @ 2 km)
    • ~ 10% of IceTop triggers give coincidences
    • with deep array

4 IceTop stations currently operating (black)

operating in coincidence with String 21