21st International Conference on Computing in High Energy and Nuclear Physics (CHEP2015)

Upgrade of the ATLAS Level-1 Trigger with event topology information

13 Apr 2015, 14:45

15m

Village Center (Village Center)

oral presentation Track1: Online computing Track 1 Session

Speaker

Eduard Ebron Simioni (Johannes-Gutenberg-Universitaet Mainz (DE))

Description

The Large Hadron Collider (LHC) in 2015 will collide proton beams with increased luminosity from $10^{34}$ up to $3 \times 10^{34}$ cm$^{−2}$ s$^{−1}$. ATLAS is an LHC experiment designed to measure decay properties of highly energetic particles produced in these proton-collisions. The high luminosity places stringent physical and operational requirements on the ATLAS Trigger in order to reduce the 40 MHz collision rate to an event storage rate of 1 kHz, thereby retaining events with valuable physics content. The hardware-based first ATLAS trigger level (Level-1) has an output rate of 100 kHz and decision latency of less than 2.5 µs. It is composed of the Calorimeter Trigger (L1Calo), the Muon Trigger (L1Muon) and the Central Trigger Processor. In 2014, there will be a new trigger system has been added: the Topological Processor System (L1Topo system). The L1Topo system consists of a single AdvancedTCA shelf equipped with three L1Topo processor blades. It processes detailed information from L1Calo and L1Muon in individual state-of-the-art FPGA processors to derive desitions based on the topology of each collision event. Such topologies are the angles between jets and/or leptons or global event variables based on lists of pre-selected/-sorted objects. The system is designed to receive and process up to 6 Tb/s of real time data. The talk is about the relevant upgrades of the Level-1 trigger with focus on the topological processor design and commissioning.

Presentation materials

Slides

Simioni_CHEP2015.pdf