0000000000398446

AUTHOR

J. A. Wear

showing 6 related works from this author

STUDIES OF WIRE GAIN AND TRACK DISTORTION NEAR THE SECTOR EDGES OF THE ALEPH TIME PROJECTION CHAMBER

1986

Abstract The materials used to hold the wires at the sector edges in a large Time Projection Chamber (TPC) inrtoduce distortions of the electric drift field near those edges. These distortions degrade tracking information and sometimes cause large changes in wire gain near the edge. We have studied these two problems for the ALEPH TPC and have found that both can be greatly reduced by the addition of two field correction strips held at appropriate voltages.

PhysicsNuclear and High Energy PhysicsTime projection chamberField (physics)business.industryTrack (disk drive)STRIPSEdge (geometry)Tracking (particle physics)law.inventionOpticslawDistortionbusinessInstrumentationVoltage
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Management and Control of the Read Out Processors (tpps) of the Aleph Time Projection Chamber

1989

The readout of the Aleph time projection chamber (TPC) relies on a set of 72 time projection processors (TPPs), which are based on a Motorola 68020 microprocessor running a real-time operating system. The advanced processing capabilities of the TPPs allow them to perform in parallel a number of tasks, both during and outside of data acquisition, which are outlined. The management and control of such a large number of intelligent devices is presented. The discussion covers the hardware configuration of the TPPs; the software running the TPPs; their management, status, and control; exception handling and message logging; and the TPP monitoring tasks. >

Nuclear and High Energy PhysicsAlephTime projection chamberComputer sciencebusiness.industryException handlingElectrical engineeringlaw.inventionSet (abstract data type)MicroprocessorData acquisitionSoftwareNuclear Energy and EngineeringlawElectrical and Electronic EngineeringProjection (set theory)businessComputer hardware
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TRACKING WITH THE ALEPH TIME PROJECTION CHAMBER

1991

The tracking performance of the ALEPH time projection chamber (TPC) has been studied using the data taken during the LEP (Large Electron-Positron Collider) running periods in 1989 and 1990. After careful correction of residual distortions and optimization of coordinate reconstruction algorithms, a single coordinate resolution of 173 mu m in the azimuthal and 740 mu m in the longitudinal direction is achieved. This results in a momentum resolution for the TPC alone of Delta p/p/sup 2/=0.0012 (GeV/c)/sup -1/. In combination with the ALEPH inner tracking chamber (ITC), a total momentum resolution of Delta p/p/sup 2/=0.0008 (GeV/c)/sup -1/, close to the design specifications, is reached. >

PhysicsNuclear and High Energy PhysicsMomentum (technical analysis)AlephTime projection chamberPhysics::Instrumentation and DetectorsParticle acceleratorTracking (particle physics)Particle detectorlaw.inventionNuclear physicsAzimuthNuclear Energy and EngineeringlawHigh Energy Physics::ExperimentElectrical and Electronic EngineeringCollider
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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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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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PERFORMANCE OF THE ALEPH TIME PROJECTION CHAMBER

1991

The performance of the ALEPH Time Projection Chamber (TPC) has been studied using data taken during the LEP running periods in 1989 and 1990. After correction of residual distortions and optimisation of coordinate reconstruction algorithms, single coordinate resolutions of 173-mu-m in the azimuthal and 740-mu-m in the longitudinal direction are achieved. This results in a momentum resolution for the TPC of DELTA-p/p2 = 1.2 x 10(-3) (GeV/c)-1. In combination with the ALEPH Inner Tracking Chamber (ITC), a total momentum resolution of DELTA-p/p2 = 0.8 x 10(-3) (GeV/c)-1 is obtained. With respect to particle identification, the detector achieves a resolution of 4.4% for the measurement of the i…

PhysicsNuclear and High Energy PhysicsTime projection chamberPhysics::Instrumentation and DetectorsTracking (particle physics)Particle identificationParticle detectorMomentumNuclear physicsAzimuthPair productionHigh Energy Physics::ExperimentDetectors and Experimental TechniquesInstrumentationImage resolution
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