ACAT 2021

Commissioning LHCb's GPU High Level Trigger

contribution ID 749

Nov 30, 2021, 5:00 PM

20m

S221-A (Virtual and IBS Science Culture Center)

Oral Track 1: Computing Technology for Physics Research Track 1: Computing Technology for Physics Research

Speaker

Christina Agapopoulou (Centre National de la Recherche Scientifique (FR))

Description

From 2022 onward, the upgraded LHCb experiment will use a triggerless readout system collecting data at an event rate of 30 MHz. A software-only High Level Trigger will enable unprecedented flexibility for trigger selections. During the first stage (HLT1), a sub-set of the full offline track reconstruction for charged particles is run to select particles of interest based on single or two-track selections. This includes decoding the raw data, clustering of hits, pattern recognition, as well as track fitting, ghost track rejection with machine learning techniques and finally event selections. HLT1 will be processed entirely on O(100) GPUs. We will present the integration of the GPU HLT1 into LHCb's data acquisition system in preparation for data taking in 2022.

Presentation materials

acat_301121_allencomissioning.pdf

Recording