Abstract
The existing three-level ATLAS trigger system is deployed to reduce the event rate from the bunch crossing rate of 40 MHz to ∼200 Hz for permanent storage at the LHC design luminosity of 1034 cm-2 s -1. When the LHC exceeds the design luminosity, the load on the Level-2 trigger system will significantly increase due both to the need for more sophisticated algorithms to suppress background and the larger event sizes. The Fast Tracker is a proposed upgrade to the current ATLAS trigger system that will operate at the full Level-1 accepted rate of 100 kHz and provide high quality tracks at the beginning of processing in the Level-2 trigger, by performing track reconstruction in hardware with massive parallelism of associative memories. The concept design is being advanced and justified with the performance in important physics areas, b-tagging, τ-tagging and lepton isolation. The prototyping with current technology is underway and R&D with new technologies has been started.
Original language | English (US) |
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Article number | C12037 |
Journal | Journal of Instrumentation |
Volume | 5 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2010 |
Keywords
- Digital electronic circuits
- Trigger concepts and systems (hardware and software)
ASJC Scopus subject areas
- Instrumentation
- Mathematical Physics