Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 41: DAQ, trigger and electronics II

T 41.1: Talk

Tuesday, March 16, 2021, 16:00–16:15, Tp

Particle Track Fitting in Hardware for the ATLAS Phase II Update — •Joachim Zinßer, Sebastian Dittmeier, and André Schöning — Physikalisches Institut, Universität Heidelberg, Deutschland

Due to the planned increase in luminosity during the ATLAS Phase II Upgrade, it is necessary to filter interesting events more efficiently. It is planned to install a filter based on the particle tracks, which, have to be evaluated in real time. The parameters of the helix-shaped trajectories can be approximated linearly.

This task is well suited for an implementation in hardware since, on the one hand, it requires only basic arithmetics and comparisons, and, on the other hand, it can be implemented in a highly parallel hardware architecture, e.g. by exploiting FPGAs.

The Hardware Track Trigger (HTT) group of ATLAS-TDAQ decided to follow an approach that utilizes a database of simulated trajectories. The Track-Fitter is implemented on the Intel Stratix 10 with an integrated High Bandwidth Memory (HBM) for storing the constants for the linear fit of the parameters. The FPGA will be mounted on a mezzanine board that connects it to a group of Associate Memory ASICs that store the simulated trajectories.

This talk will focus on the way in which the fit parameters are calculated within the FPGA-logic.