Abstract
The NA62 experiment at the CERN SPS aims to measure the Branching Ratio of the very rare kaon decay K+→π+νν̄ collecting O(100) events with a 10% background in two years of data taking. To reject the K+→π+π0 background the NA48 liquid krypton calorimeter will be used in the 1-10 mrad angular region. The status of the Liquid Krypton Electromagnetic Calorimeter Level 0 Trigger is presented.
Highlights
In order to suppress the background from K+ → π+π0 decay an efficient photon veto system is foreseen
The Liquid Krypton calorimeter will be readout by the new Calorimeter REAdout Modules [5] (CREAMs) which will provide 40 MHz 14 bit sampling for all 13248 calorimeter readout channels, data buffering, optional zero suppression and programmable trigger sums for the Level 0 electromagnetic calorimeter trigger processor
Information on reconstructed clusters is used by the Level 0 Trigger Processor to veto decays with more than one cluster in the Liquid Krypton calorimeter
Summary
In order to suppress the background from K+ → π+π0 decay an efficient photon veto system is foreseen. In the 1-10 mrad angular region the NA48 electromagnetic calorimeter is used [4]. This calorimeter is a quasi-homogeneous ionization device using liquid krypton as active medium and characterized by excellent time and energy resolution. The Liquid Krypton calorimeter will be readout by the new Calorimeter REAdout Modules [5] (CREAMs) which will provide 40 MHz 14 bit sampling for all 13248 calorimeter readout channels, data buffering, optional zero suppression and programmable trigger sums for the Level 0 electromagnetic calorimeter trigger processor
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