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High Granularity Calorimeter ( HGCal )

Learn about what a calorimeter is, its importance, the features of HGCal, its design, location, and radiation distribution and damage. Discover the technical aspects and significance of this high granularity calorimeter in particle detection. Explore the concepts of full energy absorption, sensitivity to high-energy particles, and radiation exposure concerns within the HGCal system.

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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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