The KLOE experiment's main goal is to measure the CP violation parameter R(epsilon'/epsilon) with an accuracy of O(10-4). Such a high level precision imposes stringent conditions in term of energy (<5%/sqrt[E(GeV)]) and time resolution (<70ps/sqrt[E(GeV)]) on the calorimeter and its electronics. The trigger system, mostly based on the calorimeter signals, must be fast and fully efficient (>99%) for all events relevant to study CP violation. It must also have good background rejection to keep the overall data rate at a reasonable level. The whole readout electronic chain (preamplifier, splitter, shaper, discriminator, ADC, TDC), custom designed to have low noise, high bandwidth, small time jitter, good stability and linearity will be described and its performances presented. The calorimetric trigger will also be discussed from a topological and electronic point of view. |
|