Outline Electromagnetic showers Shower Development Characteristics of showers Shower Detectors DHCal Design Concept Conclusion.

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Presentation transcript:

Outline Electromagnetic showers Shower Development Characteristics of showers Shower Detectors DHCal Design Concept Conclusion

Electromagnetic Showers Electrons with energies > 100MeV lose energy almost entirely through bremsstrahlung  e + + e - (Pair Production)

e+e+ e+e+ e-e- e-e-  0123

Characteristics N(t) = e tln2 t max = ln(E o /E)/ln2 L  E 0 /E Showers are statistical in nature

Shower detectors Calorimeters measure the total energy deposited Two types – Electromagnetic and Hadronic t max = lnE o The total energy is measured by counting the number of particles in the shower whose energy exceeds certain value

Hadronic Showers Transverse momentum = 350MeV/c Hence hadronic showers are more spread out. Most of the energy dissipated is by ionization losses and secondary protons  o  2  (leading to showers)

DHCal

From CERN-open , A. Sharma

Initial design concept for gas amplification DHCAL

CERN GDD Group – electron-micrograph of GEM foil hole

Conclusion Study of various technologies Construction of mechanical prototypes Construction of multi layer prototype

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