ЕМ calorimeter requirements

• Rapidity coverage - largest possible to observe rare processes. The best granularity for ||<2.5 (e/), coarser for 2.5<||<5 (jet,E^T_miss).
• Electron reconstruction capability from 1-2 GeV (e from b-decays) up to 5 TeV (Z' and W' decays)
• Exellent energy resolution over the energy range 10-300 GeV (to achieve 1% mass resolution for H ->  and H -> 4e channels).
• Total thickness of at least 24 radiation lengths at = 0 (to keep contribution to the energy resolution from longitudinal fluctuations of high-energy showers (E>500 GeV) to an acceptable level.
• Dynamic range 50 MeV (electronic noise per channel) to 3 TeV (e from decays of Z' and W' with masses 5-6 TeV).
• Energy-scale precision 0.1% (200 MeV precision on the Higgs mass) Linearity of response better than 0.5% (up to 300 GeV).
• Measurement of the shower direction e with a resolution of ~50 mrad/sqrt(E)
• Exellent /jet, e/jet, /jet separation
• Speed of response, noise, high granularity, bunch-crossing identification, neutron fluences up to 1015 n/cm2 and rad.doses up to 200 kGy (over 10 years)...