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IFAE 2006 pp 361-364 | Cite as

The CMS High-Level Trigger

  • Pietro Govoni
Conference paper

Abstract

At the LHC, the Large Hadron Collider that will start operating the next year at CERN, proton beams will collide with energies of 7 TeV each. The beams will be composed by several bunches, that will collide in the interacting points with a frequency of about 40 MHz. The CMS experiment (Compact Muon Solenoid), which is one of the two multi-purpose experiments that will take data, will have to cope with such a high interaction rate and reduce it to the order of 100 Hz, that is the constraint given by the persistency on tape. This reducing rate of a factor of O(106) of single events of 2MB size will be achieved in two separate stages: the level one trigger (L1) [1], implemented by means of hardware devices, and the high-level trigger (HLT) [2], implemented in a software way on a farm of commercial PCs.

Keywords

Large Hadron Collider Proton Beam Compact Muon Solenoid Hardware Device Technical Design Report 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    The Trigger and Data Acquisition project, Volume I: The Level 1 Trigger. Technical Design Report. CERN/LHCC 2000-038Google Scholar
  2. 2.
    The Trigger and Data Acquisition project, Volume II: Data Acquisition and Hihg-level Trigger. Technical Design Report. CERN/LHCC 2002-26Google Scholar

Copyright information

© Springer-Verlag Italia 2007

Authors and Affiliations

  • Pietro Govoni
    • 1
  1. 1.Università e INFN di Milano-BicoccaItaly

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