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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Spiwoks, R. Amaral, P.B. Ellis, N. Farthouat, P. Gallno, P. Haller, J. Maeno, T. Pauly, T. Junior, H.P.L. Arcas, I.R. Schuler, G. de Seixas, J.M. Teixeira, R.T. Wengler, T. |
| Copyright Year | 1963 |
| Abstract | ATLAS is a detector at CERN's Large Hadron Collider where bunches of protons in counter-rotating beams will cross every 25 ns producing, on average, about 25 collisions for a total interaction rate of 1 GHz. A three-level trigger system selects bunch crossings potentially containing interesting processes. The Level-1 trigger, implemented in electronics and firmware, makes an initial selection in under 2.5 mus with an output rate of less than 100 kHz. A key element of this is the core module of the Central Trigger Processor which combines trigger information from the calorimeter and muon trigger processors to make the final Level-1 accept decision in under 75 ns. The event-selection algorithm used by the core module is based on lists of selection criteria, i.e., trigger menus, and is implemented in fully programmable look-up tables and content-addressable memories. In addition to the event selection, the core module generates dead-time in order to limit the frequency of Level-1 accepts to a rate that the sub-detector front-end electronics can support. The core module further provides trigger-summary information to the Level-2 trigger and to the data acquisition system. The design of the core module is presented, and results from recent laboratory tests and from tests with the calorimeter and muon trigger processors connected to detectors in a particle beam are shown |
| Sponsorship | IEEE Nuclear and Plasma Sciences Society Computer Applications in Nuclear and Plasma Sciences (CANPS) Lawrence Berkeley Lab. Lawrence Livermore Nat. Lab. APS College of William and Mary Continuous Electron Beam Accelerator Facility NASA Defence Nuclear Agency Sandia National Laboratories Jet Propulsion Laboratory Brookhaven Nat. Lab. Lawrence Livermore Nat. Lab IEEE/NPPS Radiat. Effects Committee Defence Nuclear Agency/DoD Sandia National Laboratories/DOE Jet Propulsion Laboratory/NASA Phillips Lab./DoD |
| Starting Page | 3211 |
| Ending Page | 3215 |
| Page Count | 5 |
| File Size | 598099 |
| File Format | |
| ISSN | 00189499 |
| Volume Number | 52 |
| Issue Number | 6 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2005-12-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Particle beams Mesons Testing Large Hadron Collider Protons Colliding beam devices Microprogramming Frequency Data acquisition Laboratories trigger Digital electronics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nuclear and High Energy Physics Electrical and Electronic Engineering Nuclear Energy and Engineering |
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