L1Calo Phase – I Upgrade

Optical Transmission

Tile Rear Extension (TREX) Module

The Tile Rear Extension (TREX) module for the Phase-I Upgrade of the ATLAS L1Calo Trigger System

Tigran Mkrtchyan and Damir Raßloff, Kirchhoff Institute for Physics, Heidelberg UniversityOn behalf of the ATLAS TDAQ Collaboration

Real-time Path to FEXes Readout Path

Slow Control, Monitoring

L1Calo PreProcessor

• Identification of events with high-ET electrons, photons, taus, jets, large ETmiss and ΣET based

on the input of the Liquid Argon (LAr) and Tile Calorimeters (TileCal)• Increased robustness against pile-up, better

isolation performance, while maintaininglow trigger thresholds and high efficiency

• Unchanged analogue input from TileCalà 32 PPMs will be extended with TREX

• 3 new digital subsystems in Run3:• Electron Feature Extractor(eFEX)

à e/γ and τ identification• Jet Feature Extractor(jFEX)

à Identifies jets, computes ΣET, ETmiss

• Global Feature Extractor(gFEX)à Identifies large-R jets, ΣET, ET

miss

• Each TREX receives 48 LVDS streams from the PPM at 480 Mbps:à 32 0.1 x 0.1 (Δη x Δφ) 8-bit ET resultsà 16 0.2 x 0.2 (Δη x Δφ) 9-bit jet sums

• Data rate can be doubled to drive the real-time output at 80 MHz (960 Mbps)

• Deserialized, formatted and sent via optical links to the FEXes

• For each Level-1 Accept, the PPM event data is formatted and sent to the DAQ via 2 interfaces:à FELIX: via a single optical link at 9.6Gbps in FELIX Full Modeà legacy ROD: via single optical link at 960 Mbps in G-Link transmission mode

• Physical extension of the PPM• Provides digitized hadronic transverse

energy from TileCal to the FEXes at 40.08 MHz via optical fibers

• Maintains transmission to the legacy trigger via 11m long electrical cables

• Four 12-channel Samtec FireFly optical transmitters (48 output links)à provide results to the FEXes

at 11.2 Gbps• One 4-channel Samtec FireFly Duplex

Transceiver (4 input, 4 output links)à Bi-directional communication

with the Front-End LinkExchange (FELIX)

• 18-layer PCB hosting:à 1 Xilinx Kintex UltraScale FPGA

Collection, formatting and transmitionof real-time and readout data (PREDATOR)

à 4 Xilinx Artix-7 FPGAsSignal duplication for the legacy and FEXprocessors (DINO)

à 1 MPSoC Xilinx Zynq UltraScale+Collection and transmission of on-board slow-control data

• Consists of 128 identical PreProcessorModules (PPMs)

• Processing of analog trigger-tower signals with granularity of mainly 0.1 x 0.1 (Δη x Δφ)

• 16 Multi-Chip Modules(nMCMs):à Each processes 4 analog signalsà 10-bit dual channel FADCS at 80 MHzà Bunch-crossing Identification

algorithmsà Pipelined event data readout

TREX to FELIX readout packetLVDS data streams recorded at the PPM output

PRBS-31 pattern from the Duplex transceiver

High-Speed Link Tests:

PRBS-31 patterns sent from the transmitter

Schematic overview of the TREX module

The PreProcessor Module

L1Calo in Run3

• Managed by a MPSoC Zynq Ultrascale+• Periodical collection of environment

parameters via I2C• Communication with the ATLAS Detector

Control System (DCS) via an OPC UA server and TCP/IP

LHCC Poster Session – CERN, February 19, 2020

TREX pre-production module

TREX to legacy ROD readout packet

Ref: Technical Design Report for the Phase-I Upgrade of the ATLAS TDAQ System - ATLAS-TDR-023