The evolution of the Trigger and Data Acquisition System in the ATLAS experiment

15th International Workshop on Advanced Computing and Analysis Techniques in Physics Research

物理学;计算机科学

Krasznahorkay, A.^1,2

New York University, New York, United States^1

European Laboratory for Particle Physics (CERN), Geneva, Switzerland^2

关键词: ATLAS experiment;    Commodity hardware;    Development status;    High-level triggers;    Homogeneous system;    Proton proton collisions;    Trigger and data acquisition;    Trigger and data acquisition system;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/523/1/012019/pdf
DOI  :  10.1088/1742-6596/523/1/012019

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The ATLAS experiment, aimed at recording the results of LHC proton-proton collisions, is upgrading its Trigger and Data Acquisition (TDAQ) system during the current LHC first long shutdown. The purpose of the upgrade is to add robustness and flexibility to the selection and the conveyance of the physics data, simplify the maintenance of the infrastructure, exploit new technologies and, overall, make ATLAS data-taking capable of dealing with increasing event rates. The TDAQ system used to date is organised in a three-level selection scheme, including a hardware-based first-level trigger and second- and third-level triggers implemented as separate software systems distributed on separate, commodity hardware nodes. While this architecture was successfully operated well beyond the original design goals, the accumulated experience stimulated interest to explore possible evolutions. We will also be upgrading the hardware of the TDAQ system by introducing new elements to it. For the high-level trigger, the current plan is to deploy a single homogeneous system, which merges the execution of the second and third trigger levels, still separated, on a unique hardware node. Prototyping efforts already demonstrated many benefits to the simplified design. In this paper we report on the design and the development status of this new system.