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Calorimeter System (CLIC design)

ECAL

Barrel

  • 40 layers of Tungsten absorber (1.9 mm) + Silicon Pad sensor;
  • cell size: 5x5 mm2;
  • r_min = 1500 mm; r_max = 1702 mm;
  • half_length = 2210 mm;
  • symmetry = dodecahedron.

Endcap

  • 40 layers of Tungsten absorber (1.9 mm) + Silicon Pad sensor;
  • cell size: 5x5 mm2;
  • r_max = 1700 mm;
  • z_min = 2307; z_max = 2509;
  • symmetry = dodecahedron.

HCAL

Barrel

  • 60 layers of Steel absorber (19 mm) + plastic scintillating tiles;
  • cell size: 30x30 mm2;
  • r_min = 1740 mm; r_max = 3330 mm;
  • half_length = 2210 mm;
  • symmetry = dodecahedron.

Endcap

  • 60 layers of Steel absorber (19 mm) + plastic scintillating tiles;
  • cell size: 30x30 mm2;
  • r_max = 3246 mm;
  • z_min = 2539; z_max = 4129;
  • symmetry = dodecahedron.

Occupancy of BIB at 1.5 TeV

Average occupancies per bunch crossing, obtained with a minimal energy threshold of 0.2 MeV without timing cuts:

  • ECAL Barrel: 0.9 hits/cm2 at the surface
  • ECAL Endcap: 0.2 hits/cm2 at the surface
  • HCAL Barrel: 0.06 hits/cm2 at the surface
  • HCAL Endcap: 0.02 hits/cm2 at the surface

Average occupancies as a function of the depth:

Occupancy BarrelBarrel

Occupancy EndcapEndcap

Recommended acquisition timing window to remove most of the beam-induced background: -250 ps, +250 ps with respect to the time of arrival of a photon from the bunch crossing.

Jet reconstruction performance

Jet reconstruction is performed starting from the calorimeter system according to the following strategy:

Jet reco

Preliminary jet reconstruction performance on b-jets in the presence of the beam-induced background at 1.5 TeV, with a not-fully-optimized algorithm configuration:

Reco Performance

Alternative ECAL barrel design (Crilin)

The following ECAL barrel design optimized for muon collider (Crilin) is currently under testing in simulation:

  • Barrel:
    • 5 layers of PbF2 absorber (35 mm) + SiPM;
    • cell size: 10x10 mm2;
    • r_min = 1500 mm; r_max = 1702 mm;
    • half_length = 2210 mm;
    • symmetry = dodecahedron.

Geant4 realization of Crilin:

Crilin

Design of Crilin cell prototype currently tested at Laboratori Nazionali di Frascati:

Crilin cell