A novel calorimeter trigger concept: The jet trigger of the H1 experiment at HERA

We report on a novel trigger for the liquid argon calorimeter which was installed in the H1 Experiment at HERA. This trigger, called the “Jet Trigger”, was running at level 1 and implemented a real-time cluster algorithm. Within only 800 ns, the Jet Trigger algorithm found local energy maxima in the...

Full description

Saved in:
Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-06, Vol.641 (1), p.58-71
Main Authors: Olivier, Bob, Dubak-Behrendt, Ana, Kiesling, Christian, Reisert, Burkard, Aktas, Adil, Antunovic, Biljana, Bracinik, Juraj, Braquet, Charles, Brettel, Horst, Dulny, Barbara, Fent, Jürgen, Fras, Markus, Fröchtenicht, Walter, Haberer, Werner, Hoffmann, Dirk, Modjesch, Miriam, Placakyte, Ringaile, Schörner-Sadenius, Thomas, Wassatsch, Andreas, Zimmermann, Jens
Format: Article
Language:English
Subjects:
Accelerators
Algorithms
Clusters
H1 experiment
HERA
Jet finder
Jets
LAr calorimeter
Liquids
Real time
Running
Summer
Trigger
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on a novel trigger for the liquid argon calorimeter which was installed in the H1 Experiment at HERA. This trigger, called the “Jet Trigger”, was running at level 1 and implemented a real-time cluster algorithm. Within only 800 ns, the Jet Trigger algorithm found local energy maxima in the calorimeter, summed their immediate neighbors, sorted the resulting jets by energy, and applied topological conditions for the final level 1 trigger decision. The Jet Trigger was in operation from the year 2006 until the end of the HERA running in the summer of 2007. With the Jet Trigger it was possible to substantially reduce the thresholds for triggering on electrons and jets, giving access to a largely extended phase space for physical observables which could not have been reached in H1 before. The concepts of the Jet Trigger may be an interesting upgrade option for the LHC experiments.
ISSN:0168-9002
1872-9576
DOI:10.1016/j.nima.2011.03.001