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High Granularity Calorimeter ( HGCal )

High Granularity Calorimeter ( HGCal ). 9/5/2018. Content. What is a calorimeter? Why use a calorimeter? What is HGCal ? What does it look like? Where is it? Radiation distribution and damage at HGCal. 1. What is a calorimeter?. This is NOT a calorimeter!!!. This is a calorimeter!.

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High Granularity Calorimeter ( HGCal )

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  1. High Granularity Calorimeter(HGCal) Peter Paulitsch 9/5/2018

  2. Content • What is a calorimeter? • Why use a calorimeter? • What is HGCal? • What does it look like? • Where is it? • Radiation distribution and damage at HGCal

  3. 1. What is a calorimeter? This is NOT a calorimeter!!! This is a calorimeter!

  4. 1. What is a calorimeter? • Goal: Full absorption of particle energy • Heat, ionization, excitation, Cherenkov… • Silicon detectors: EM - ionization • Practically: Eprimary∝ Edeposited∝ Signal • ∆E/E∝ √N-1 higher res. at higher Energy! • Shower shape particle typee-, γ, π+… • Lshower∝ log E T. Bergauer, VO Grundlagen der Teilchendetektoren

  5. 2. Why use a calorimeter? • Remember: ∆E/E better at higher E •  high E particlescalorimetric! • Sensitivity onEM / hadronicinteractions C. Lippmann, Particle identification, NIM 2012

  6. 3. What is HGCal? • Sampling (sandwich)calorimeter • High granularity • High luminosity LHC showers overlap • Smaller cell sizes  better ∆t, ∆θ and ∆E

  7. 4. What does it look like? • Hexagonal layout max tileable area on circular wafer • Sensor elements (diodes) also hexagonal Actual sensor design in KLayout

  8. 4. What does it look like? • Hexagonal sensor tiles glued to readout electronics and base structure • Sensor  module  cassette Technical Design Report, April 2018

  9. 5. Where is it? Technical Design Report, April 2018

  10. 5. Where is it? Technical Design Report, April 2018 CE-E:„Calorimeter Endcap – Electromagnetic“

  11. 6. Radiation distribution

  12. 6. Radiation damage • “Standard radiation model”: NIEL hypothesis • Non-ionizing energy loss • Displacement damage ∝ ENIEL • Radiation damage depending on particle type and energy • Normalized to 1 MeV neutrons • Fluence at CE-E: Up to Φneq≈ 1016/cm² D ≈ 1 MGy  high radiation exposure  advanced radiation models  enhanced sensor radiation hardness

  13. Thank you! Enough calories or appetite for questions?

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