The ATLAS Level-1 calorimeter trigger (L1Calo) is a hardware-based system that identifies events containing calorimeter-based physics objects, including electrons, photons, taus, jets, and missing ...transverse energy. In preparation for Run 3, when the LHC will run at higher energy and instantaneous luminosity, L1Calo is currently implementing a significant programme of planned upgrades. The existing hardware will be replaced by a new system of feature extractor (FEX) modules, which will process finer-granularity information from the calorimeters and execute more sophisticated algorithms to identify physics objects; these upgrades will permit better performance in a challenging high-luminosity and high-pileup environment.
This article describes the design, testing and production of the ATLAS Region of Interest Builder (RoIB). This device acts as an interface between the Level 1 trigger and the high level trigger (HLT) ...farm for the ATLAS LHC detector. It distributes all of the Level 1 data for a subset of events to a small number of (16 or less) individual commodity processors. These processors in turn provide this information to the HLT. This allows the HLT to use the Level 1 information to narrow data requests to areas of the detector where Level 1 has identified interesting objects.
LHCb Silicon Tracker infrastructure Ermoline, Yuri
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2004, Letnik:
518, Številka:
1
Journal Article
Recenzirano
The LHCb Silicon Tracker is a vital part of the experiment. It consists of four planar stations: one trigger and three inner tracking stations. The operation of the Silicon Tracker detectors and ...electronics is provided by its infrastructure: cooling system, high- and low-voltage power supply systems, temperature and radiation monitoring systems. Several components of these systems are located in the experimental hall and subjected to radiation. This paper mainly concentrates on the recent development: requirements definition, evaluation of possible implementation scenarios, component choice and component radiation tests.
LHCb is one of the experiments for the Large Hadron Collider at CERN and is dedicated to B-physics and CP-violation measurements. To exploit its physics potential good tracking performance with high ...efficiency in a high particle density environment close to the beam pipe is required. Silicon strip detectors with large read-out pitch and long strips will be used for the LHCb Inner Tracker behind the magnet and the Trigger Tracker station in front of the magnet. We report here about the design of the Silicon Tracker, test beam results and the electrical tests foreseen during production
The LHCb silicon tracker Adeva, B.; Agari, M.; Bauer, C. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
07/2005, Letnik:
546, Številka:
1
Journal Article
Recenzirano
LHCb is a dedicated B-physics and CP-violation experiment for the Large Hadron Collider at CERN. Efficient track reconstruction and excellent trigger performances are essential in order to exploit ...fully its physics potential. Silicon strip detectors providing fast signal generation, high resolution and fine granularity are used for this purpose in the large area Trigger Tracker station in front of the spectrometer magnet and the LHCb Inner Tracker covering the area close to the beam pipe behind the magnet. Long read-out strips of up to 38
cm are used together with fast signal shaping adapted to the 25
ns LHC bunch crossing. The design of these tracking stations, the silicon sensor strip geometries and the latest test results are presented here.
LHCb vertex detector electronics timing and synchronization Ermoline, Yuri
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2001, Letnik:
461, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Synchronization of the electronics is the key issue at LHC with the short-bunch crossing period, the very high trigger rate and the large number of detector channels. The vertex detector signals from ...200
K channels have to be sampled optimally. The consistency of the event data fragments from all detector channels must be guaranteed during data flow in the front-end and off-detector electronics and the data acquisition system. The ongoing activity in the LHCb vertex detector is described. The necessary synchronization hardware and procedure to detect synchronization errors and to recover with a minimum data losses are presented.
The ATLAS high level trigger ATM testbed Calvet, D.; Gachelin, O.; Huet, M. ...
IEEE transactions on nuclear science,
04/2000, Letnik:
47, Številka:
2
Journal Article
Recenzirano
This paper describes an implementation of the high level trigger for the ATLAS experiment on a large testbed based on a 32 node switch attached to data sources, event processing units, supervisor ...modules and interface to the level-1 trigger. We describe the functionality of each component and investigate its performance. We show the operation of the complete system and outline future activities.
This paper describes an implementation on a small scale demonstrator of the sequential option for the ATLAS trigger. This demonstrator is built around an ATM switch connecting source modules, ...destination processors, a supervisor and a monitor. The source modules emulate a group of detector read-out buffers. We describe the hardware and software architecture of the system. We investigate the performance of the demonstrator in various configurations and with different sets of input parameters. Finally, we discuss the scaling of the results to the design of a large trigger system for ATLAS.
The PreProcessor system of the ATLAS Level-1 Calorimeter Trigger (L1Calo) receivesabout 7200 analogue signals from the electromagnetic and hadronic components of thecalorimetric detector system. ...Lateral division results in cells which are pre-summed to so-called Trigger Towers of size 0.1 x 0.1 along azimuth ( phi ) and pseudorapidity ( eta ). The received calorimetersignals represent deposits of transverse energy. The system consists of 124 individual PreProcessor modules that digitise the input signalsfor each LHC collision, and provide energy and timing information to the digital processors of the L1Calo system, which identify physics objects forming much of the basis for the full ATLAS first level trigger decision. This paper describes the architecture of the PreProcessor, its hardware realisation, functionality, and performance.
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