Commissioning of the CMS High Level Trigger
Abstract
The CMS experiment will collect data from the proton-proton collisions delivered by the Large Hadron Collider (LHC) at a centre-of-mass energy up to 14 TeV. The CMS trigger system is designed to cope with unprecedented luminosities and LHC bunch-crossing rates up to 40 MHz. The unique CMS trigger architecture only employs two trigger levels. The Level-1 trigger is implemented using custom electronics, while the High Level Trigger (HLT) is based on software algorithms running on a large cluster of commercial processors, the Event Filter Farm. We present the major functionalities of the CMS High Level Trigger system as of the starting of LHC beams operations in September 2008. The validation of the HLT system in the online environment with Monte Carlo simulated data and its commissioning during cosmic rays data taking campaigns are discussed in detail. We conclude with the description of the HLT operations with the first circulating LHC beams before the incident occurred the 19th September 2008.
Keywords
Cite
@article{arxiv.0908.1065,
title = {Commissioning of the CMS High Level Trigger},
author = {Lorenzo Agostino and Gerry Bauer and Barbara Beccati and Ulf Behrens and Jeffrey Berryhil and Kurt Biery and Tulika Bose and Angela Brett and James Branson and Eric Cano and Harry Cheung and Marek Ciganek and Sergio Cittolin and Jose Antonio Coarasa and Bryan Dahmes and Christian Deldicque and Elizabeth Dusinberre and Samim Erhan and Dominique Gigi and Frank Glege and Robert Gomez-Reino and Johannes Gutleber and Derek Hatton and Jean-Francois Laurens and Constantin Loizides and Frank Ma and Frans Meijers and Emilio Meschi and Andreas Meyer and Remigius K. Mommsen and Roland Moser and Vivian O'Dell and Alexander Oh and Luciano Orsini and Vaios Patras and Christoph Paus and Andrea Petrucci and Marco Pieri and Attila Racz and Hannes Sakulin and Matteo Sani and Philipp Schieferdeckerd and Christoph Schwick and Josep Francesc Serrano Margaleff and Dennis Shpakov and Sean Simon and Konstanty Sumorok and Andre Sungho Yoon and Peter Wittich and Marco Zanetti},
journal= {arXiv preprint arXiv:0908.1065},
year = {2009}
}