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in subjects: "Drift Chambers"

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

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Performance and development of dE/dx counters

The performance of existing or nearly completed detectors for particle identification by using the relativistic rise of energy loss will be discussed. Detailed analysis of systematic errors leads finally to large detector systems approaching the ultimate resolution as measured in small test devices. New methods for extracting the information from the counter with the potential of better particles separation than standard dE/dx will be presented. It includes very fine sampling, delta-ray clippin… more

Date: September 1, 1980

Creator: Walenta, A. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Bose-Einstein correlations in e/sup +/e/sup -/ collisions

The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhanceme… more

Date: December 1, 1987

Creator: Juricic, I.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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D. phi. vertex drift chamber construction and test results

A jet-cell based vertex chamber has been built for the D{O} experiment at Fermilab and operated in a test beam there. Low drift velocity and diffusion properties were achieved using CO{sub 2}(95%)-ethane(5%) at atmospheric pressure. The drift velocity is found to be consistent with (9.74+8.68( E -1.25)) {mu}m/nsec where E is the electric field strength in (kV/cm < E z 1.6 kV/cm.) An intrinsic spatial resolution of 60 {mu}m or better for drift distances greater than 2 mm is measured. The track p… more

Date: May 1, 1991

Creator: Clark, A.R.; Goozen, F.; Grudberg, P.; Klopfenstein, C.; Kerth, L.T.; Loken, S.C. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charged particle detector system for ISABELLE spectrometers

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Sensitive and simple method for measuring wire tensions

Measuring tension of wires in drift chambers and multiwire proportional chambers after construction is an important process because sometimes wires get loose after soldering, crimping or glueing. One needs to sort out wires which have tensions below a required minimum value to prevent electrostatic instabilities. There have been several methods reported on this subject in which the wires were excited either with sinusoidal current under magnetic field or with sinusoidal voltage electrostaticall… more

Date: August 1, 1982

Creator: Atac, M. & Mishina, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Personal extrapolation of CDF test beam use to the SSC

The author's personal experience in test beam usage at CDF is used to predict SSC needs at the point of turn-on. It is concluded that the test beam demand will reflect the scale of effort involved in SSC detectors rather than the total number of them. Provision for later expansion is recommended. It is also recommended that the test beam facilities, as well as detector electronics, should reflect the available dynamic range; particularly, a single high energy beam derived from the SSC could be … more

Date: June 23, 1986

Creator: Nodulman, L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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ACE: AMY CDC (Central Drift Chamber) Fast Track Finder

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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MPS II drift-chamber system

A new system of detectors (MPS II) which has been installed and operated in the Brookhaven National Laboratory Multiparticle Spectrometer (MPS), consisting of short drift distance drift chambers is briefly described. (WHK)

Date: May 13, 1982

Creator: Etkin, A.; Eiseman, S. & Foley, K.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Open and hidden charm muoproduction. [209 GeV]

New results are presented on open and hidden charm and bottom production by 209-GeV muons interacting in a magnetized steel calorimeter. The upper limit on the production of T states by muons is sigma(..mu..N ..-->.. ..mu..UPSILONX)B(UPSILON ..-->.. ..mu mu..) < 22 x 10/sup -39/ cm/sup 2/ (90% confidence level). The distributions of elastically produced psi's are consistent with s-channel helicity conservation (SCHC) and disagree with psi dominance. From analysis of dimuon final states the cros… more

Date: September 1, 1980

Creator: Clark, A.R.; Johnson, K.J. & Kerth, L.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Outlook for studies of gamma-gamma collisions at PEP

A preview of the two-photon physics that can be expected to result from the initial PEP program is presented. The experimental detectors are discussed with emphasis placed on their capabilities and limitations to do studies of gamma-gamma interactions. 7 figures, 1 table.

Date: June 1, 1980

Creator: Burke, D.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Tracking and vertex finding with drift chambers and neural networks

Finding tracks, track vertices and event vertices with neural networks from drift chamber signals is discussed. Simulated feed-forward neural networks have been trained with back-propagation to give track parameters using Monte Carlo simulated tracks in one case and actual experimental data in another. Effects on network performance of limited weight resolution, noise and drift chamber resolution are given. Possible implementations in hardware are discussed. 7 refs., 10 figs.

Date: September 1, 1991

Creator: Lindsey, C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Mark III results from SPEAR

First results from the MARK III detector at SPEAR are presented based on 2.7 million J/psi decays. The eta/sub c/ is observed in three modes, J/psi ..-->.. ..gamma..eta/sub c/, (eta/sub c/ ..-->.. rho anti rho, eta..pi../sup +/..pi../sup -/, and phi phi). Using the phi phi mode, the eta/sub c/ spin-parity is determined to be 0/sup -/. The known radiative J/psi decays J/psi ..-->.. ..gamma..f(f ..-->.. ..pi../sup +/..pi../sup -/), ..gamma..eta'(eta' ..-->.. ..gamma..rho/sup 0/, eta..pi../sup +/.… more

Date: November 1, 1983

Creator: Toki, W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Nuclear structure at intermediate energies

The theme that unites the sometimes seemingly disparate experiments undertaken by the Bonner Lab Medium Energy Group is a determination to understand in detail the many facets and manifestations of the strong interaction, that which is now referred to as nonperturbative QCD. Whether we are investigating the question of just what does carry the spin of baryons, or the extent of the validity of the SU(6) wavefunctions for the excited hyperons (as will be measured in their radiative decays in our … more

Date: September 30, 1991

Creator: Bonner, B. E. & Mutchler, G. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Front-end data processing the SLD data acquisition system

The data acquisition system for the SLD detector will make extensive use of parallel at the front-end level. Fastbus acquisition modules are being built with powerful processing capabilities for calibration, data reduction and further pre-processing of the large amount of analog data handled by each module. This paper describes the read-out electronics chain and data pre-processing system adapted for most of the detector channels, exemplified by the central drift chamber waveform digitization a… more

Date: July 1, 1986

Creator: Nielsen, B. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Recent results from MAC

Some preliminary results from the MAC detector at PEP are presented. These include measurements of the angular distribution of ..gamma gamma.., ..mu mu.. and tau tau final states, a determination of the tau lifetime, a measurement of R, and a presentation of the inclusive muon p/sub perpendicular/ distribution for hadronic events.

Date: May 1, 1982

Creator: MAC Collaboration

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Front-end electronics development for the SSC

This is a status report on electronics development undertaken by the Front-End Electronics Collaboration. The overall goal of the collaboration remains the development by 1992 of complete, architecturally compatible, front end electronic systems for calorimeter, wire drift chamber, and silicon strip readout. We report here a few highlights to give a brief overview of the work underway. Performance requirements and capabilities, selected architectures, circuit designs and test results are presen… more

Date: December 1, 1990

Creator: Levi, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Preliminary spectrometer results from E-802

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Second coordinate readout in drift chambers by charge division

The drift time measurement and the charge division can be performed simultaneously on the same electrode (resistive anode) without affecting the accuracy of either measurement. It is shown that for the shortest measurement time there is an optimum value for the anode wire resistance. The signal requirement for a position uncertainty sigma less than or equal to 0.5% of the anode wire length is only 2.7 x 10/sup 6/ electron charges. The drift chamber can be operated in the linear mode and with ne… more

Date: October 1, 1977

Creator: Radeka, V. & Rehak, P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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MPS II drift chamber system

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Summary of activity. Topic I: detectors and experiments. [High-energy detectors for use at ISABELLE]

Results of a workshop studying detectors for Isabelle experimental halls are described. The detectors must be very reliable. Spatial resolution of the tracking detectors must be high to provide accurate measurements of angle and momentum, retain a short resolving time, and show excellent multiparticle handling capability. Included in the study were hodoscopes, drift chambers, proportional chambers, time projection chambers, Cherenkov counters, electromagnetic shower detectors, and hadron calori… more

Date: unknown

Creator: Marx, J. & Ozaki, S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Update to the RHIC Letter of Intent for an experiment on particle and jet production at midrapidity

This document is an Update to the Letter of Intent (LOI) submitted by this collaboration in September 1990 proposing a large acceptance solenoidal tracking experiment. Since that time the collaboration has chosen the name STAR, representing Solenoidal Tracker At RHIC. The physics interests of the STAR collaboration and the goals of the experiment are described in the original LOI. Since submission of the LOI, several changes have been made in the design of the experiment motivated by the desire… more

Date: July 1, 1991

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Position-sensitive gas proportional chambers

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.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Charged particle detector system for high rate experiments

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

Item Type: Article

Partner: UNT Libraries Government Documents Department