Search results for "Nuclear electronics"

showing 10 items of 29 documents

PESIC: An Integrated Front-End for PET Applications

2007

An ASIC front-end has been developed for multi-anode photomultiplier based nuclear imaging devices. Its architecture has been designed to improve resolution and decrease pile-up probability in Positron Emission Tomography systems which employ continuous scintillator crystals. Analog computation elements are isolated from the photomultiplier by means of a current sensitive preamplifier stage. This allows digitally programmable adjustment of every anode gain, also providing better resolution in gamma event position calculation and a shorter front-end deadtime. The preamplifier stage also offers the possibility of using other types of photomultiplier devices such as SiPM. The ASIC architecture…

PhysicsFront and back endsPhotomultiplierSilicon photomultiplierPreamplifierAmplifierNuclear electronicsScintillation counterElectronic engineeringImage resolution2007 15th IEEE-NPSS Real-Time Conference
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The ATLAS level-1 trigger: Status of the system and experience from commissioning with cosmic ray muons

2007

The detector at CERN's large hadron collider (LHC) was exposed to proton-proton collisions from beams crossing at 40 MHz. A three-level trigger system will select potentially interesting events in order to reduce this rate to 100- 200 Hz. A trigger decision is made by the Level-1 central trigger processor (CTP) reducing the incoming rate to less than 100 kHz. The Level-1 decision is based on calorimeter information and hits in dedicated muon trigger detectors. The final Level-1 trigger system is currently being installed in the experiment with completion expected in autumn 2007. Cosmic ray data are regularly recorded as an increasing fraction of the trigger system comes online. We present a…

PhysicsMuonLarge Hadron ColliderCalorimeter (particle physics)Physics::Instrumentation and DetectorsReal-time computingDetectorCosmic rayNuclear physicsmedicine.anatomical_structureAtlas (anatomy)Nuclear electronicsSystems architecturemedicinePhysics::Accelerator Physics2007 IEEE Nuclear Science Symposium Conference Record
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THE FASTBUS READ-OUT SYSTEM FOR THE ALEPH TIME PROJECTION CHAMBER

1989

The readout system for the Aleph central tracking detector, a large time projection chamber (TPC), consists of more than 100 FASTBUS crates with approximately 1000 FASTBUS modules. The detector and its associated electronics are briefly presented, followed by a more detailed description of the readout and control system. The discussion covers the sector readout, electronics calibration, front-end data acquisition, data pipelining, and service request handling. Experiences with the system are discussed. >

PhysicsNuclear and High Energy PhysicsAlephTime projection chamberPhysics::Instrumentation and Detectorsbusiness.industryDetectorAstrophysics::Instrumentation and Methods for AstrophysicsTracking (particle physics)Data acquisitionNuclear Energy and EngineeringNuclear electronicsControl systemElectronic engineeringElectronicsElectrical and Electronic EngineeringbusinessComputer hardware
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The read-out processors of the Aleph time projection chamber and their performance

1990

The Aleph detector is installed on the LEP electron-positron storage ring. Its central tracking detector, a time projection chamber (TPC), has about 50000 channels of sampling electronics. The digitized signals are processed by 72 double-width Fastbus modules built around an MC 68020 processor. The time projection processor is described, and the solutions, both hardware and software, adopted to run and manage such a complex system in a Fastbus-VAX environment are discussed. Practical experience with the system is reported. >

PhysicsNuclear and High Energy PhysicsAlephTime projection chamberbusiness.industryDetectorElectrical engineeringTracking (particle physics)Particle detectorSoftwareNuclear Energy and EngineeringNuclear electronicsElectrical and Electronic EngineeringProjection (set theory)businessComputer hardwareIEEE Transactions on Nuclear Science
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Pre-production validation of the ATLAS level-1 calorimeter trigger system

2006

The Level-1 Calorimeter Trigger is a major part of the first stage of event selection for the ATLAS experiment at the LHC. It is a digital, pipelined system with several stages of processing, largely based on FPGAs, which perform programmable algorithms in parallel with a fixed latency to process about 300 Gbyte/s of input data. The real-time output consists of counts of different types of trigger objects and energy sums. Prototypes of all module types have been undergoing intensive testing before final production during 2005. Verification of their correct operation has been performed stand-alone and in the ATLAS test-beam at CERN. Results from these investigations will be presented, along …

PhysicsNuclear and High Energy PhysicsLarge Hadron ColliderCalorimeter (particle physics)Computer sciencePhysics::Instrumentation and Detectorsbusiness.industryReal-time computingATLAS experimentProcess (computing)Latency (audio)Calorimetermedicine.anatomical_structureBackplaneNuclear Energy and EngineeringAtlas (anatomy)Nuclear electronicsElectronic engineeringmedicineData pre-processingDetectors and Experimental TechniquesElectrical and Electronic EngineeringbusinessField-programmable gate arrayComputer hardwareIEEE Transactions on Nuclear Science
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The Crystal Barrel data acquisition system

1992

The main detector components of the Crystal Barrel (CBAR) experiment at the Low Energy Antiproton Ring (LEAR) at CERN are two proportional wire chambers, a jet drift chamber and an electromagnetic calorimeter composed of 1380 CsI(Tl) crystals, with a total of 4380 analog channels. A description is given of the use of distributed VME-based microcomputers to collect data from the various subdetectors and to merge the full event information in a global event builder. At this level the data are transferred to a mu VAX for tape storage and monitoring. >

PhysicsNuclear and High Energy PhysicsLarge Hadron ColliderMagnetic tape data storagePhysics::Instrumentation and DetectorsDetectorlaw.inventionNuclear physicsAnalog televisionData acquisitionNuclear Energy and EngineeringlawAntiprotonNuclear electronicsScintillation counterPhysics::Accelerator PhysicsHigh Energy Physics::ExperimentElectrical and Electronic EngineeringIEEE Transactions on Nuclear Science
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Construction, test and commissioning of the triple-gem tracking detector for compass

2002

The Small Area Tracking system of the COMPASS experiment at CERN includes a set of 20 large area, fast position-sensitive Gas Electron Multiplier (GEM) detectors, designed to reliably operate in the harsh radiation environment of the experiment. We describe in detail the design, choice of materials, assembly procedures and quality controls used to manufacture the devices. The test procedure in the laboratory, the performance in test beams and in the initial commissioning phase in the experiment are presented and discussed.

PhysicsNuclear and High Energy PhysicsLarge Hadron ColliderPhysics::Instrumentation and Detectorsbusiness.industryDetectorTracking systemTracking (particle physics)Nuclear physicsNuclear electronicsCompassGas electron multiplierCOMPASS experimentDetectors and Experimental TechniquesbusinessInstrumentationComputer hardwareNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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ATLAS level-1 calorimeter trigger: subsystem tests of a Jet/Energy-sum Processor module

2003

The ATLAS Level-1 Calorimeter Trigger consists of a Preprocessor, a Cluster Processor (CP), and a Jet/Energy-sum Processor (JEP). The CP and JEP receive digitised trigger-tower data from the Preprocessor and produce trigger multiplicities and total and missing energy for the final trigger decision. The trigger will also provide region-of-interest (RoI) information for the Level-2 trigger and intermediate results of the data acquisition (DAQ) system for monitoring and diagnostics by using readout driver modules (ROD). The Jet/Energy-sum Processor identifies and localises jets, and sums total and missing transverse energy information from the trigger data. The Jet/Energy Module (JEM) is the m…

PhysicsNuclear and High Energy PhysicsMissing energyPhysics::Instrumentation and DetectorsAtlas (topology)business.industryAstrophysics::High Energy Astrophysical PhenomenaEnergy informationData acquisitionNuclear Energy and EngineeringTest vectorNuclear electronicsElectronic engineeringPreprocessorDetectors and Experimental TechniquesElectrical and Electronic EngineeringbusinessComputer hardwareIEEE Transactions on Nuclear Science
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Front-End Electronics for the KAOS Spectrometer at MAMI

2009

A new front-end electronics system has been developed for the electron arm tracking detectors in the Kaos spectrometer at the Mainz microtron MAMI. The signals of multi-anode photomultipliers are collected by 96-channel front-end boards, digitized by double-threshold discriminators and the signal time is picked up by F1 TDC chips. The system was designed to process more than 4,000 channels and to cope with the high electron flux in the spectrometer and the high count rate requirement of the detectors. A subset of 288 channels was installed and successfully used in the 2008 data taking period of the Kaos spectrometer.

PhysicsNuclear and High Energy PhysicsPhotomultiplierSpectrometerbusiness.industryDetectorElectrical engineeringTracking (particle physics)Signaldouble-threshold discriminator; front-end electronics; multi-anode photomultiplier; microtronNuclear Energy and EngineeringNuclear electronicsElectrical and Electronic EngineeringKAOSbusinessMicrotronIEEE Transactions on Nuclear Science
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Breakthrough in pulse-shape based particle identification with silicon detectors

2000

Identification of charged particles is an important method in nuclear spectroscopy. We have achieved a major breakthrough that makes the pulse-shape discrimination (PSD) method with a single solid-state detector comparable to and sometimes better than the traditional telescope technique. By using rear-side injection in over-biased surface barrier n-type Si detectors made from homogeneously doped n-TD silicon, and extracting the pulse-shape information already at the preamplifier level we have reached improved Z and even A discrimination over a wide dynamic range. Previously good separation with the PSD technique required a major degradation of time resolution and inferior energy resolution.…

PhysicsNuclear and High Energy PhysicsRange (particle radiation)SiliconPreamplifierbusiness.industryDetectorchemistry.chemical_elementParticle identificationIsotope separationlaw.inventionOpticsNuclear Energy and EngineeringchemistrylawNuclear electronicsWide dynamic rangeElectronic engineeringElectrical and Electronic Engineeringbusiness1999 IEEE Nuclear Science Symposium. Conference Record. 1999 Nuclear Science Symposium and Medical Imaging Conference (Cat. No.99CH37019)
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