13722156
Enhancement of the ATLAS trigger system with a hardware tracker finder FTK
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.
124742096
THE ELECTROMAGNETIC CALORIMETER OF THE HERA-B EXPERIMENT
54034724
The HERA-B electromagnetic calorimeter pre-trigger system
SummaryIn this document the pretrigger system developed for the electromagnetic calorimeter of the HERA-B experiment is described. The system owns a lot of frontier features for calorimetry-based triggers and its design performances are such that some possible implementations of it can be foreseen for the future high-energy collider experiments.
122900738
Neutron background determination in the Gran Sasso laboratory by means of a novel coincidence neutron spectrometer
SummaryWe present the results of recent background measurements in the Gran Sasso Laboratory. The measurements were performed by a coincidence neutron spectrometer, allowing neutron identification by means of two different stages of pulse-amplitude analysis.
109274131
The EDRO Board Connected to the Associative Memory: a “Baby” FastTracKer Processor for the ATLAS Experiment
Abstract The FastTracKer (FTK), a hardware dedicated processor, performs fast and precise online full track reconstruction at the ATLAS experiment, within an average latency of few dozens of microseconds. Before production of the ﬁnal system for tracking in high-occupancy conditions with the best of available technology, we plan to use existing prototypes of the FTK hardware to exercise its functions in the ATLAS environment. We describe the “baby FTK”, consisting of a few hardware elements implementing the ﬁrst stages of the system, and discuss our plans to grow the system into a full-functionality FTK “vertical slice” covering a small projective wedge of the detector. We report on the performances and structure of the “baby FTK”, including the pixel/strip hit clustering (clustering mezzanine), hit organization and distribution (EDRO) and the Associative Memory pattern recognition function. We describe brieﬂy also the possible future evolution including the addition of the Track Fitter.
55332577
THE HERA-B ELECTRON PRETRIGGER SYSTEM
In this paper the pretrigger system designed for the electromagnetic calorimeter of the HERA-B experiment is described. This system will provide the electron candidates to the first-level trigger. The first results obtained with a whole readout and pretrigger prototype chain are also described. ( 1998 Elsevier Science B.V. All rights reserved.
116847052
The LHCb RICH PMTs Readout Electronics and the Monitoring of the HPDs Quantum Efficiency