328 research outputs found
EXCLUSIVE rho0 AND phi PRODUCTION IN DEEP INELASTIC MUON SCATTERING
No full textAshman J, Badelek B, Baum G, et al. Exclusive Rho 0 and Phi production in deep inelastic muon scattering. Z.Phys. C. 1988;39(2):169-175
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A review of 4/pi/ /hacek C/erenkov ring imaging detectors
No full textThe design choices for 4/pi/ ring imaging /hacek C/erenkov counters -- both those of principle and those of practice -- are reviewed. The progress in construction and the performance of the devices being built for DELPHI and SLD are discussed. 13 refs., 22 figs
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Review of recent progress in the development of Cerenkov Ring Imaging Detectors
No full textThe principle behind the Cherenkov Ring Imaging Detectors (CRIDs) involves focussing the Cherenkov light, emitted by a relativistic charged particle in passing through a radiator medium, onto a high efficiency photocathode which can be in turn read out with good spatial resolution, to localize the point of origin of the photoelectrons. This information permits the reconstruction of the circle of Cherenkov light for each particle above threshold, and hence the determination of the Cherenkov angle to an accuracy of a few percent. The groups currently working on these detectors are discussed, the status of these projects is examined, and progress is reported on the R and D on two 4-pi devices being prepared for physics at the Z. The activities are being done at Fermilab, CERN, and SLAC. 8 refs., 32 figs. (LEW
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Use of elementary particle interactions for radiological imaging
No full textThe potential for the use of inelastic high energy particle reactions to produce radiological images is parable to that of computerized axial tomography at a fraction of the radiation exposure. In addition, the comparison of coherently produced events to the total inelastic cross section should allow a probe of the chemical composition (i.e., average Z) of the material being studied. The performance of this technique is reviewed and some preliminary results using a 5 GeV/c ..pi../sup -/ beam at SLAC are presented
Preliminary results on tests of a Cerenkov ring imaging device employing a photoionizing PWC
No full textA brief description of techniques and problems of ring imaging Cerenkov detectors employing photoionizing PWC's is discussed. Preliminary results on a one dimensional ring imaging device tested at SLAC in May and June of 1978 are then presented. These results include rough measurements of the Cerenkov ring in nitrogen, argon, neon, and helium produced by a collimated positron beam
Detectors of Internally Reflected Cherenkov Light (DIRC) for Charged Particle Identification
No full textDetectors of Internally Reflected Cherenkov light (DIRC) are powerful devices for charged particle identification (PID). Indeed, the primary detector to separate kaons and pions up to few GeV/c in the barrel region of the BABAR experiment was based on the DIRC technology and performed extremely well over almost a decade of operation. In the first part of this talk, we will review the DIRC principles (charged particles emit Cherenkov light when crossing fused silica bars; part of the photons are trapped by total internal reflection and propagate in the radiators until a camera where they are detected by photon detectors) and the associated experimental challenges. We will focus on the BABAR ring-imaging Cherenkov detector, the DIRC. After presenting its design, we will summarize its performances such as the experience gained by operating this apparatus at the SLAC PEP-II asymmetric B-Factory, which delivered more than 500/fb of integrated luminosity with a peak luminosity at 1.2 10^34 /cm^2/s. Then, we will describe the R&D program which aims at designing a new generation DIRC detector, able to work at much higher luminosity (and background) while keeping excellent PID performances. This effort, which started during the last years of the BABAR running, has led to a design for the Focusing DIRC detector (FDIRC), which is currently being tested at SLAC in a cosmic ray telescope. The main difference between the BABAR DIRC and the FDIRC is a completely redesigned photon camera: small blocks of fused silica (the same material as the DIRC bars in which charged particles generate the Cherenkov light) including two mirrors and instrumented with fast multi-anode photomultipliers now replace the huge tank filled with ultra-pure water used in the BABAR design. We will also briefly present a concept of DIRC-based detector for PID in the endcap region of a HEP detector, originally designed for the SuperB project, now terminated due to lack of funding
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Cerenkov counters at ISABELLE. [71 references]
No full textThe Cherenkov counter described for use at Isabelle is a threshold counter in which light is focussed on phototubes. The counter is applicable in large-angle, small-aperture magnetic spectrometers for measurement of particle yields at large p/sub T/. Three of these counters will provide complete ..pi..-K-p separation in the range of 7-20 GeV/c. Other Cherenkov counters are discussed and a bibliography of relevant literature on the counters utilizing photoionization is included. (FS
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Evaluation of detectors for a Cerenkov ring-imaging chamber
No full textResults are presented from an ongoing study of single photon detectors for use in a ring-imaging Cerenkov counter. New results on the operation of parallel plate avalanche gaps are presented
Detectors of Internally Reflected Cherenkov Light (DIRC) for Charged Particle Identification
No full textDetectors of Internally Reflected Cherenkov light (DIRC) are powerful devices for charged particle identification (PID). Indeed, the primary detector to separate kaons and pions up to few GeV/c in the barrel region of the BABAR experiment was based on the DIRC technology and performed extremely well over almost a decade of operation. In the first part of this talk, we will review the DIRC principles (charged particles emit Cherenkov light when crossing fused silica bars; part of the photons are trapped by total internal reflection and propagate in the radiators until a camera where they are detected by photon detectors) and the associated experimental challenges. We will focus on the BABAR ring-imaging Cherenkov detector, the DIRC. After presenting its design, we will summarize its performances such as the experience gained by operating this apparatus at the SLAC PEP-II asymmetric B-Factory, which delivered more than 500/fb of integrated luminosity with a peak luminosity at 1.2 10^34 /cm^2/s. Then, we will describe the R&D program which aims at designing a new generation DIRC detector, able to work at much higher luminosity (and background) while keeping excellent PID performances. This effort, which started during the last years of the BABAR running, has led to a design for the Focusing DIRC detector (FDIRC), which is currently being tested at SLAC in a cosmic ray telescope. The main difference between the BABAR DIRC and the FDIRC is a completely redesigned photon camera: small blocks of fused silica (the same material as the DIRC bars in which charged particles generate the Cherenkov light) including two mirrors and instrumented with fast multi-anode photomultipliers now replace the huge tank filled with ultra-pure water used in the BABAR design. We will also briefly present a concept of DIRC-based detector for PID in the endcap region of a HEP detector, originally designed for the SuperB project, now terminated due to lack of funding
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High gain multigap avalanche detectors for Cerenkov ring imaging
No full textWe report on a continuing study of multigap parallel plate avalanche chambers, primarily as photoelectron detectors for use with Cerenkov ring imaging counters. By suitable control of the fields in successive gaps and by introducing screens to reduce photon feedback to the cathode the gain many be increased considerably. We have obtained gains in excess of 6 x 10/sup 7/ for photoelectrons with a good pulse height spectrum and expect to increase this further. We discuss the use of resistive anodes to give avalanche positions in two dimensions by charge division
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