[en] The NA62 experiment at the CERN SPS aims to measure the Branching Ratio of the very rare kaon decay K⁺→π⁺νν-bar 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.

[en] The goal of the NA62 experiment at the CERN SPS is the measurement of the Branching Ratio of the very rare kaon decay K⁺→π⁺ ν ν-bar with a 10% accuracy by collecting 100 events in two years of data taking. An efficient photon veto system is needed to reject the K⁺→π⁺ π⁰ background and a liquid krypton electromagnetic calorimeter will be used for this purpose in the 1-10 mrad angular region. The L0 trigger system for the calorimeter consists of a peak reconstruction algorithm implemented on FPGA by using a mixed parallel architecture based on soft core Altera NIOS II embedded processors together with custom VHDL modules. This solution allows an efficient and flexible reconstruction of the energy-deposition peak. The system will be totally composed of 36 TEL62 boards, 108 mezzanine cards and 215 high-performance FPGAs. We describe the design, current status and the results of the first performance tests

[en] The NA62 experiment at CERN Super Proton Synchrotron aims at studying ultra-rare decays of charged kaons for precise tests of the Standard Model. The complete experimental setup is being commissioned for the first physics data taking in the autumn of 2014. This paper presents the final design and implementation of the Level-0 trigger system of the LKr calorimeter, acting as hermetic photon veto of the experiment in the 1-8.5 mrad region. The first on-field performance tests are presented

[en] The NA62 experiment at the CERN SPS aims at measuring the branching ratio of the very rare kaon decay K"+ → π"+ ν ν-bar (expected 10"−"1"0) 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

[en] The NA62 experiment at CERN SPS has started its data-taking. Its aim is to measure the branching ratio of the ultra-rare decay K ⁺ → π⁺ν ν̅ . In this context, rejecting the background is a crucial topic. One of the main background to the measurement is represented by the K ⁺ → π⁺π⁰ decay. In the 1-8.5 mrad decay region this background is rejected by the calorimetric trigger processor (Cal-L0). In this work we present the performance of a soft-core based parallel architecture built on FPGAs for the energy peak reconstruction as an alternative to an implementation completely founded on VHDL language.

[en] The NA62 experiment at the CERN SPS aims at measuring the branching ratio of the very rare kaon decay K ⁺ → π⁺ ν ν-bar (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 trigger system setup during the 2016 physics data taking. A newly implemented cluster counting algorithm is also presented.

[en] The document describes the front-end electronics that instrument the spectrometer of the OPERA experiment. The spectrometer is made of two separate modules. Each module consists of 22 RPC planes equipped with horizontal and vertical strips readout for a total amount of about 25,000 digital channels. The front end electronics is self-triggered and has single plane readout capability. It is made of three different stages: the Front End Boards (FEBs) system, the Controller Boards (CBs) system and the Timing Boards (TBs) system. The FEB system provides discrimination of the strip incoming signals; a FAST OR output of the input signals is also available for trigger plane signal generation. FEBs discriminated signals are acquired by the CBs system that manages also the communication to the experiment DAQ and Slow Control interface. A Trigger Board allows to operate in both self-trigger (the FEB FAST OR signal starts the plane acquisition) or external-trigger (different conditions can be set on the OR signals generated from different planes) modes