A study of a second level track trigger for ATLAS

doi:10.1016/0168-9002(93)91080-7

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume 336, Issues 1–2, 15 November 1993, Pages 59-77

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Abstract

This paper discusses some of the problems of triggering at a high energy, high luminosity pp collider. A suggested second level track trigger for the ATLAS detector is described, based on hit information from a silicon tracker. Detailed Monte Carlo simulations have been performed to assess the performance of the trigger in accepting electrons and in rejecting the QCD jets that would fake electrons in the first level calorimeter trigger. Studies of the feasibility of implementing such a trigger are also presented.

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Cited by (6)

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Programmable active memories in real-time tasks: implementing data-driven triggers for LHC experiments
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The future Large Hadron Collider (LHC), to be built at CERN, presents among other technological challenges a formidable problem of real-time data analysis. At a primary event rate of 40 MHz, a multi-stage trigger system has to analyze data to decide which is the fraction of events that should be preserved on permanent storage for further analysis. We report on implementations of local algorithms for feature extraction as part of triggering, using the detectors of the proposed ATLAS experiment as a model. The algorithms were implemented for a decision frequency of 100 kHz, on different data-driven programmable devices based on structures of field-programmable gate arrays and memories. The implementations were demonstrated at full speed with emulated input, and were also integrated into a prototype detector running in a test beam at CERN, in June 1994.
A commercial image processing system considered for triggering in future LHC experiments
1995, Nuclear Inst. and Methods in Physics Research, A
Experiments at the future Large Hadron Collider (LHC) at CERN will be faced with an extraordinary problem of event selection in real time. Algorithms at different levels of locality are needed, among them local feature extraction algorithms that are typical in many image processing tasks. We report here about implementations of several such local algorithms on a commercial modular image processing system, for a decision frequency of 100 kHz (“second-level”). Such devices can keep up with the required decision frequency for suitable algorithms, for some algorithms custom hardware additions would be necessary.
Recent results of radiation damage studies in silicon
1994, Nuclear Inst. and Methods in Physics Research, A
The RD2 Collaboration is making preliminary studies on a silicon tracking detector for use at the LHC. It is a priority that this detector should withstand the high level of radiation to be expected for LHC operation. Therefore systematic studies on the change of the detector performance due to radiation damage have been made, or are in progress. Well established results on neutron related damage at room temperature have been extended to lower temperatures, as foreseen for operation at LHC. For comparison proton damage studies have also been started. The detector properties under investigation include the reverse current, the depletion voltage and the charge collection efficiency. With a compressed 10 year LHC operational scenario we have successfully checked the ability of silicon detectors to survive the period influences of high fluence irradiation and subsequent annealing.
Review of the trigger systems of the ATLAS and CMS detectors at the LHC
2007, Physics of Particles and Nuclei
Experimental challenges in high-luminosity collider physics
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A study of a second level track trigger for ATLAS

Abstract

Nucl. Instr. and Meth. A

PYTHIA 5.6, Computer Physics Commun.

The UA5 high energy pp simulation program: Nucl. Phys. B

IEEE Trans. on Consumer Electronics

The UA5 high energy $p$ p simulation program: Nucl. Phys. B