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Measurement of energy loss in the region of relativistic rise for particle identification

Description: The following boundary conditions are desirable for particle detectors providing momentum and mass measurement in a magnetic field. A multilayer drift chamber of the socalled ''bicycle'' type with a radius of 1.5 m is considered. The useful track length will be l/sub min/ = 1.3 m for a straight track at 90/sup 0/ to the beam axis. Two examples for possible subdivisions of this volume are chosen: (1) number of layers, n = 200 and thickness/layer, x = 6.5 mm; and (2) n = 56 and x = 23 mm. An anal… more
Date: January 1, 1977
Creator: Fischer, J.; Okuno, H. & Walenta, A.H.
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Partner: UNT Libraries Government Documents Department
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Charged particle detector system for ISABELLE spectrometers

Description: A detector system combining the good time resolution and low dead time of PWC's and the good space resolution of drift chambers is proposed for use in ISABELLE spectrometers. Central to this detector is the development of two integrated electronic circuit systems. The detectors are described with special emphasis on the electronic systems. The detector system proposed will be capable of handling particle flux rates typical of conventional PWC's yet providing a spacial resolution of 100 ..mu..m.… more
Date: January 1, 1977
Creator: Platner, E.D.
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Partner: UNT Libraries Government Documents Department
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ACE: AMY CDC (Central Drift Chamber) Fast Track Finder

Description: The central drift chamber (CDC) of the AMY detector at the TRISTAN e/sup /+//e/sup /-// collider features its fine granularity and multi-band structure. The tracking software named ACE which makes the most of these features shows an excellent performance for reconstruction of high multiplicity events with highly collimated jets. The obtained reconstruction efficiency is 97% for the particles coming from within 5 cm of the primary vertex with p/sub t/ /approx gt/ 500 MeVc in the simulated hadron… more
Date: January 1, 1988
Creator: Mori, T.
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Partner: UNT Libraries Government Documents Department
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Preliminary spectrometer results from E-802

Description: This report presents preliminary spectrometer results from the E-802 experiment at the Tandem-AGS accelerator complex at Brookhaven National Laboratory. The data presented were taken in late April of 1987 using a 14.5 GeV/c per nucleon /sup 28/Si beam from the AGS. Data were obtained for a variety of targets and spectrometer settings, but we present here the analysis of data for one target-angle combination: a Au target wth the spectrometer spanning 14/sup 0/ to 28/sup 0/ in the lab. At this en… more
Date: January 1, 1987
Creator: Miake, Y. & Stephans, G.S.F.
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Partner: UNT Libraries Government Documents Department
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MPS II drift chamber system

Description: The MPS II detectors are narrow drift space chambers designed for high position resolution in a magnetic field and in a very high particle flux environment. Central to this implementation was the development of 3 multi-channel custom IC's and one multi-channel hybrid. The system is deadtimeless and requires no corrections on an anode-to-anode basis. Operational experience and relevance to ISABELLE detectors is discussed.
Date: January 1, 1982
Creator: Platner, E.D.
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Partner: UNT Libraries Government Documents Department
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Position-sensitive gas proportional chambers

Description: A number of multiwire, position-sensitive, gas proportional chambers have been constructed which use fast delay line (2.5 ns/cm) readouts to provide trajectory position and angle information for particles near the focal planes of the Energetic Pion Channel and Spectrometer (EPICS) and High Resolution Spectrometer (HRS) at the Clinton P. Anderson Meson Physics Facility (LAMPF). These chambers are two dimensional with anode wires in one direction and cathode wires in the other direction. When ope… more
Date: January 1, 1977
Creator: Morris, C.L.; Hoffmann, G.W. & Thiessen, H.A.
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Partner: UNT Libraries Government Documents Department
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Charged particle detector system for high rate experiments

Description: A charged particle detector system under development at BNL for use at the Multiparticle Spectrometer (MPS) and eventually at ISABELLE is described. The object is to take full advantage of the position accuracy, resolving time and instantaneous rate capabilities of narrow anode spacing drift-proportional chambers. The system will have position resolution sigma approximately equal to 100..mu.., time resolution approximately equal to 8 ns, detector sensitive time approximately equal to 50 ns, and… more
Date: January 1, 1977
Creator: Platner, E D
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Partner: UNT Libraries Government Documents Department
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Proportional chambers and multiwire drift chambers at high rates

Description: The high event and particle rates expected for ISABELLE intersecting storage rings raise the question whether PWC's and drift chambers, now widely in use in experiments, still can operate under such conditions. Various effects depend on the number of avalanches produced per length of wire N and the size of the avalanche Q, i.e., on the number of positive ions created in an avalanche. Therefore the important parameter for the following discussion is the product QN. The minimum Q is determined by… more
Date: January 1, 1977
Creator: Walenta, A.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Long-lived particle spectrometer for the Fermilab collider

Description: An updated design is described for the large-angle spectrometer previously described in the 1976 Fermilab Summer Study. The primary objective of the device is to search for heavy stable (tau greater than or equal to 10/sup -8/ sec) particles by direct measurements of momentum, time-of-flight, energy deposition in a calorimeter, multiple dE/dx samples, and Cerenkov counter information. These quantities determine the charges and masses of stable particles which traverse the spectrometer, and prov… more
Date: January 1, 1977
Creator: Ayers, D.S. & Diebold, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Time-resolved current, current-density, and emittance measurements of the PHERMEX electron beam

Description: The PHERMEX electron-beam pulse is a burst of ten 3.3-ns micropulses separated by 20 ns. Typical accelerator operating parameters produce a mean beam micropulse energy of 26 MeV with peak current of 300-500 A. The purpose of this work is to present experimental measurements of the current, current density, and emittance of a single PHERMEX micropulse. This experiment is part of an effort to completely characterize the PHERMEX electron beam. Understanding the electron-beam parameters is necessar… more
Date: January 1, 1985
Creator: Moir, D.C.; Builta, L.A. & Starke, T.P.
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Partner: UNT Libraries Government Documents Department
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Projection chambers and dE/dx at ISABELLE

Description: The ''standard'' luminosity of 2 x 10/sup 32/ is taken as a goal for a device that measures charged particle momenta over a wide solid angle. It appears that a projection chamber is capable of operation in this mode providing care is taken to optimize the geometry with this high flux in mind. Some calculations have indicated that optimism is required but in no direction have the demands on the apparatus appeared to be well beyond those attainable. In addition dE/dx measurements yielding particl… more
Date: January 1, 1977
Creator: White, D.H.; Benary, O.; Rosenson, L.; Roe, B.; Ditzler, W.R.; Watts, T. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spectrometer detectors

Description: Comparisons of different techniques for position measurements in spectrometer focal plane detector systems are made. Capabilities and limits of gas proportional detectors are discussed.
Date: January 1, 1981
Creator: Morris, C.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Detectors and signal processing for high-energy physics

Description: Basic principles of the particle detection and signal processing for high-energy physics experiments are presented. It is shown that the optimum performance of a properly designed detector system is not limited by incidental imperfections, but solely by more fundamental limitations imposed by the quantum nature and statistical behavior of matter. The noise sources connected with the detection and signal processing are studied. The concepts of optimal filtering and optimal detector/amplifying de… more
Date: January 1, 1981
Creator: Rehak, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Data Handling for the Lepton Detector

Description: The data acquisition and processing needs of a typical lepton-oriented large-solid-angle detector were evaluated, and a configuration of the data readout systems (including microprocessors), control computer(s), and local intersection computer was recommended. Features considered explicitly include triggering and data rates, data readout and monitoring (standard device processor, event processor, and intersection event processor), and off-line computing. 6 figures, 2 tables. (RWR)
Date: January 1, 1978
Creator: Cutts, D.; Droege, T. F.; Kasha, H.; Kirsch, L. E.; Littenberg, L.; Matthews, J. A. J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress report on recent rare muon decay experiments at the Los Alamos Meson Physics Facility

Description: A search has been performed for the decays ..mu.. ..-->.. eee, ..mu.. ..-->.. e..gamma.., and ..mu.. ..-->.. e..gamma gamma.. with a sensitivity in the branching ratios at the level of 10/sup -10/. The experiment used a separated, 26 MeV/c ..mu../sup +/ beam with an average intensity of 300kHz. A total of 2.2 x 10/sup 11/ muon decays were examined for the present result. The detector for the experiment is the Crystal Box, which consists of a cylindrical drift chamber surrounded by 396 NaI(T1) c… more
Date: January 1, 1984
Creator: Hogan, G. E.; Bolton, R. D.; Bowman, J. D.; Carlini, R.; Cooper, M. D.; Duong-van, M. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Data Acquisition for a Large Neutrino Detector

Description: A hierarchical, distributed intelligence data acquisition system which has been used for the past two years in neutrino experiments at Brookhaven National Laboratory is described. Performance characteristics and the nature of problems encountered in bringing the system to maturity are discussed and some generalizations of the experience are suggested.
Date: January 1, 1983
Creator: Ahrens, L. A.; Aronson, S. A. & Connolly, P. L.
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Partner: UNT Libraries Government Documents Department
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Detecting heavy quarks

Description: In this exercise we examine the performance of a detector specifically configured to tag heavy quark (HQ) jets through direct observations of D-meson decays with a high resolution vertex detector. To optimize the performance of such a detector, we assume the small diamond beam crossing configuration as described in the 1978 ISABELLE proposal, giving a luminosity of 10/sup 32/ cm/sup -2/ sec/sup -1/. Because of the very large backgrounds from light quark (LQ) jets, most triggering schemes at thi… more
Date: January 1, 1983
Creator: Benenson, G.; Chau, L. L.; Ludlam, T.; Paige, F. E.; Platner, E. D.; Protopopescu, S. D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Operation of the AFS at L = 1. 4 x 10/sup 32/ cm/sup -2/ sec/sup -1/: a first look at data at high luminosity from the CERN ISR. [Axial Field Spectrometer]

Description: In December 1982 a run was made at the CERN ISR which utilized the superconducting low beta quadrupoles in intersection I8 at the ISR and achieved a luminosity of 1.4 x 10/sup 32/ cm/sup -2/ sec/sup -1/ for 26 x 26 GeV pp collisions. At this luminosity the mean time between inelastic collisions is about 200 ns. A comparison run was also made at the same energy with a luminosity of 3.0 x 10/sup 30/ cm/sup -2/ sec/sup -1/. The luminosity under normal running conditions is typically 1.5 x 10/sup 3… more
Date: January 1, 1983
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Radiation damage control in the BNL hypernuclear spectrometer drift chamber system

Description: A high rate drift chamber system has been in use at the BNL hypernuclear spectrometer system for the past three years. Some of the chambers have accumulated charge doses up to about 0.2 C/cm-wire without showing external signs of aging. The system design and performance will be discussed as well as the results of some laboratory drift chamber aging tests. 5 refs., 9 figs.
Date: January 1, 1986
Creator: Pile, P.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Search for D/sup *//sup 0/. -->. D/sup +/. pi. /sup -/

Description: We report on a search for the decay mode D/sup *//sup 0/(2007) ..-->.. D/sup +/..pi../sup -/ using the High Resolution Spectrometer at PEP. Although this decay is kinematically forbidden for the central mass value, it can occur through the natural width of the D/sup *//sup 0/. The D/sup +/ was reconstructed in the K/sup -/..pi../sup +/..pi../sup +/ decay mode. The mass difference distribution (K/sup -/..pi../sup +/..pi../sup +/..pi../sup +/) - (K/sup -/..pi../sup +/..pi../sup -/), which shows n… more
Date: January 1, 1987
Creator: Abachi, S.; Akerlof, C.; Baringer, P.; Blockus, D.; Brabson, B.; Brom, J.M. et al.
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Partner: UNT Libraries Government Documents Department
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Measurement of the B hadron lifetime from Mark II at PEP

Description: Using data taken by the Mark II detector at PEP, the decays of B hadrons are tagged by identifying leptons at high transverse momentum. By means of a precision inner drift chamber, the impact parameters of these leptons are measured with respect to the B production point. From this impact parameter distribution, the B hadron lifetime is found to be 0.98 +- 0.12 +- 0.13 ps. This measurement can be used to place constraints models of quark mixing. 11 refs., 2 figs., 2 tabs.
Date: January 1, 1988
Creator: Ong, R.A.
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Partner: UNT Libraries Government Documents Department
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Dimethylether: a low velocity, low diffusion drift chamber gas

Description: There are two main motivations to look for a low electron mobility gas: the first is that a low drift velocity relaxes the need to measure drift times with nanosecond (or even subnanosecond) precision; the second is that (in an ideal drift geometry), the capability of resolving two closely spaced tracks depends upon the ratio of electron mobility to ion mobility ..mu../sub e//..mu../sub i/. Since ..mu../sub i/ is rather constant, the way to separate two tracks is to slow down the electrons. Man… more
Date: January 1, 1983
Creator: Villa, F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Search for rare decay modes of the muon

Description: A brief summary is given on progress in producing an experimental apparatus, called the Crystal Box detector, for searching for extremely rare decay modes of the muon (those decays violating lepton number conservation). The Crystal Box consists of a large solid angle modular NaI(Tl) detector enclosing a cylindrical set of drift chambers and a trigger hodoscope. Associated electronic equipment is also described briefly. (LEW)
Date: January 1, 1982
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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