Abstract
The NA62 experiment at the CERN SPS aims at measuring the branching ratio of the very rare kaon decay K+ → π+ ν ν̄ (expected 10−10) with a 10% background. Since an high-intensity kaon beam is required to collect enough statistics, the Level-0 trigger plays a fundamental role in both the background rejection and in the particle identification. The calorimetric trigger collects data from various calorimeters and it is able to identify clusters of energy deposit and determine their position, fine-time and energy. This paper describes the complete hardware commisioning and the setup of the trigger for the 2015 physics data taking.
Highlights
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: The NA62 experiment at the CERN SPS aims at measuring the branching ratio of the very rare kaon decay K+ → π+νν with a 10% background
The back-end electronics is provided by 432 Calorimeter REadout Modules (CREAMs) ([5]) for the LKr and other 10 CREAMs for MUV1, MUV2, IRC and SAC
Summary
An average 10 MHz decay rate hits the downstream detectors. In order to extract few interesting decays from such an intense flux, a complex three level trigger and data acquisition system was designed [3]. The Level-0 (L0) trigger algorithm is based on different sub-detectors (in addition to the calorimetric trigger, the charged hodoscope, the muon detector, the large-angle vetoes, the RICH detector) and it is performed by dedicated custom hardware modules, with a maximum output rate of 1 MHz and a maximum latency of 1 ms. The L1 trigger has a maximum output rate of 100 kHz with a non-fixed total latency of about 1 s, while the L2 trigger, has an output rate of the order of 15 kHz with a maximum total latency equal to the basic data taking time unit, the period of the SPS beam-delivery cycle
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