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D. phi. vertex drift chamber construction and test results

Description: 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.
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Partner: UNT Libraries Government Documents Department
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Tracking and vertex finding with drift chambers and neural networks

Description: 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.
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Partner: UNT Libraries Government Documents Department
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Nuclear structure at intermediate energies

Description: 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: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Front-end electronics development for the SSC

Description: 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: Refine your search to only 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

Description: 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: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Studies of helium based drift chamber gases for high-luminosity low energy machines

Description: Future high luminosity low energy machines will need low mass tracking chambers to order to minimize multiple scattering of the relatively low momentum tracks produced at these facilities. A drift chamber using a helium based gas rather than a conventional argon based gas would greatly reduce the amount of multiple scattering. This paper summarizes measurements of the drift velocity and position resolution for gas mixtures of helium with CO{sub 2} and isobutane and helium with DME. Good spatial… more
Date: February 1, 1992
Creator: Boyarski, A.; Briggs, D. (Stanford Linear Accelerator Center, Menlo Park, CA (United States)) & Burchat, P.R. (California Univ., Santa Cruz, CA (United States). Inst. for Particle Physics)
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Partner: UNT Libraries Government Documents Department
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Silicon drift chamber studies for the RHIC STAR experiment

Description: The two-hit resolution of a silicon drift chamber is measured using a pulsed Nd:Yag laser and a time digitizer readout. The data is analyzed by forming the covariance matrix in time samples, and transforming to a matrix in amplitude and time variation of each of the two hits. The resolution of the two-hit separation is found to be better than 25 microns with a drift field of 530 V/cm and a separation of more than 500 microns, with the resolution increasing to 50 microns as the separation nears … more
Date: February 24, 1992
Creator: Humanic, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Calibration and performance of the MARK II drift chamber vertex detector

Description: We have calibrated and studied the performance of the MARK II drift chamber vertex detector with cosmic ray tracks collected with the chamber inside the MARK II detector at the SLC. The chamber achieves 30 {mu}m impact parameter resolution and 500 {mu}m track-pair resolution using CO{sub 2}/C{sub 2}H{sub 6}H{sub 6}(92/8) at 2 atmospheres pressure. The chamber has successfully recorded Z{sup 0} decays at the SLC, and resolved tracks in dense hadronic jets with good efficiency and high accuracy. … more
Date: May 1, 1990
Creator: Durrett, D.; Ford, W. T.; Hinshaw, D. A.; Rankin, P.; Smith, J. G.; Weber, P. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent experience with backgrounds at the SLC

Description: During the 1990 SLC/Mark II runs, machine backgrounds visible in the new vertex detectors were studied. These detectors had active elements at radii from 3 to 17 cm and were subjected to backgrounds unique to linear colliders. We describe recent progress in identifying sources and developing control techniques. 4 refs., 3 figs.
Date: May 1, 1991
Creator: Jacobsen, R.; Band, H.; Barklow, T.; Bazarko, A.; Brown, K.; Burke, D. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Prototype SDC Muon alignment-position monitoring concepts

Description: We have developed and tested some prototype ideas, components, and systems for monitoring the relative planar orientations, spacings between, transverse positions and rotations of the multi Muon supermodule layers in a given SDC Muon chamber projective tower. These are described and parameterized from measurements. Their resolutions are given, and long term stabilities have been determined.
Date: March 16, 1991
Creator: Eartly, D. & Johnson, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Relativistic heavy ion fragmentation at HISS (Heavy Ion Spectrometer System)

Description: An experiment was conducted at the Lawrence Berkeley Laboratory to measure projectile fragmentation of relativistic heavy ions. Charge identification was obtained by the use of a Cerenkov Hodoscope operating above the threshold for total internal reflection, while velocity measurement was performed by use of a second set of Cerenkov radiators operating at the threshold for total internal reflection. Charge and mass resolution for the system was {sigma}{sub Z} = 0.2 e and {sigma}{sub A} = 0.2 u.… more
Date: October 1, 1990
Creator: Tull, C.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The front-end analog and digital signal processing electronics for the drift chambers of the Stanford Large Detector

Description: The front-end signal processing electronics for the drift-chambers of the Stanford Large Detector (SLD) at the Stanford Linear Collider is described. The system is implemented with printed-circuit boards which are shaped for direct mounting on the detector. Typically, a motherboard comprises 64 channels of transimpedance amplification and analog waveform sampling, A/D conversion, and associated control and readout circuitry. The loaded motherboard thus forms a processor which records low-level … more
Date: October 1, 1990
Creator: Haller, G.M.; Freytag, D.R.; Fox, J.; Olsen, J.; Paffrath, L.; Yim, A. (Stanford Linear Accelerator Center, Menlo Park, CA (USA)) et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electron injection in semiconductor drift detectors

Description: The paper reports the first successful results of a simple MOS structure to inject electrons at a given position in Silicon Drift Detectors. The structure allows on-line calibration of the drift velocity of electrons within the detector. The calibration is a practical method to trace the temperature dependence of the electron mobility. Several of these injection structures can be implemented in silicon drift detectors without additional steps in the fabrication process. 5 refs., 11 figs.
Date: January 1, 1990
Creator: Rehak, P. (Brookhaven National Lab., Upton, NY (USA)); Gatti, E.; Longoni, A.; Sampietro, M.; Castoldi, A. (Politecnico di Milano, Milan (Italy)) & Vacchi, A. (Rockefeller Univ., New York, NY (USA))
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Partner: UNT Libraries Government Documents Department
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Calorimeter based detectors for high energy hadron colliders

Description: This report discusses the following topics: the central calorimeter; and installation; commissioning; and calorimeter beam tests; the central drift chamber; cosmic ray and beam tests; chamber installation and commissioning; and software development; and SSC activities: the EMPACT project.
Date: January 1, 1990
Creator: Marx, M.D. & Rijssenbeek, M. (State Univ. of New York, Stony Brook, NY (USA))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Performance of the front-end signal processing electronics for the drift chambers of the Stanford Large Detector

Description: This paper reports on the performance of the front-end analog and digital signal processing electronics for the drift chambers of the Stanford Large Detector (SLD) detector at the Stanford Linear Collider. The electronics mounted on printed circuit boards include up to 64 channels of transimpedance amplification, analog sampling, A/D conversion, and associated control circuitry. Measurements of the time resolution, gain, noise, linearity, crosstalk, and stability of the readout electronics are … more
Date: October 1, 1990
Creator: Honma, A. (Victoria Univ., BC (Canada)); Haller, G.M.; Usher, T. (Stanford Linear Accelerator Center, Menlo Park, CA (USA)) & Shypit, R. (British Columbia Univ., Vancouver, BC (Canada))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Physics at e sup + e sup minus factories

Description: Feasible designs are well advanced for high-luminosity e{sup +}e{sup {minus}} storage rings which produce B{sup 0}{bar B}{sup 0} pairs either at rest or, in what appears to be a more promising option, boosted in the detector frame. Facilities which could provide samples of 30--100 fb{sup {minus}1} per year on the {Upsilon}(4S) will be proposed in early 1991. Here we examine the principal physics goal of such B Factories, namely CP violation in the b system. Methods in a variety of channels, est… more
Date: February 1, 1991
Creator: Lueth, V. (Stanford Linear Accelerator Center, Menlo Park, CA (USA)) & MacFarlane, D.B. (McGill Univ., Montreal, PQ (Canada))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Drift chamber tracking with neural networks

Description: We discuss drift chamber tracking with a commercial log VLSI neural network chip. Voltages proportional to the drift times in a 4-layer drift chamber were presented to the Intel ETANN chip. The network was trained to provide the intercept and slope of straight tracks traversing the chamber. The outputs were recorded and later compared off line to conventional track fits. Two types of network architectures were studied. Applications of neural network tracking to high energy physics detector trig… more
Date: October 1, 1992
Creator: Lindsey, C.S.; Denby, B. & Haggerty, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Interaction region considerations for a B-factory

Description: The goal of the project is to observe CP violation in the {bar B}B system. This machine is supposed to be a factory for high energy physics, not an R D project for accelerator physics. There are a number of interrelated design issues arising from the different desires of the detector and the machine, some of which are listed in this paper. A number of background and beampipe issues are mentioned. The emphasis is on calculations. Any satisfactory design will combine measurements on existing mach… more
Date: July 1, 1990
Creator: DeStaebler, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Recent results from the Crystal Barrel experiment

Description: The Crystal Barrel experiment has been constructed and installed at the Low Energy Antiproton Ring (LEAR) at CERN. It has been fully operational since late 1989. In this talk, recent results of meson spectroscopy in p[bar p]-annihilations are presented. The main emphasis is on all-neutral annihilations, the study of the strange quark content of the proton, and the investigation of the decay mode of il particles. A 2[sup ++] resonance decaying into [pi][degrees][pi][degrees]at a mass of 1515 [pl… more
Date: October 9, 1991
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Partner: UNT Libraries Government Documents Department
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Experimental particle physics at the University of Pittsburgh. [Dept. of Physics and Astronomy]

Description: During the past year on Task A, the HELIOS work drew to a close with first results from the electron-muon pair studies (no anomalous sources are seen, and the final results and uncertainties are being set). First data from CMD2 will allow improvement of some phi branching ratios, including some improved limits on forbidden decays. The engineering run for E865 is scheduled for June and July of 1993. The principal efforts of Task B, the Fermilab program, have been the completion of the analysis o… more
Date: April 1, 1993
Creator: Cleland, W. E.; Engels Jr., E.; Humanic, T. J.; Perera, U.; Shepard, P. F. & Thompson, J. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[Medium energy meson research]

Description: The activities of this group are primarily concerned with experiments using the Crystal Barrel Detector. This detector is installed and operating at the Low Energy Antiproton Ring (LEAR) at CERN. QCD, the modem theory of the strong interaction, is reasonably well understood at high energies, but unfortunately, low-energy QCD is still not well understood, and is far from being adequately tested. The Crystal Barrel experiments are designed to provide some of the tests. The basic line of research … more
Date: January 1, 1992
Creator: Crowe, K.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Properties of hadronic decays of the Z boson

Description: The decays of the Z{sup 0} boson to quarks and subsequently to hadrons were first directly observed in 1989 with the Mark II detector. This report studies the general properties of the hadronic events in the initial data sample recorded at center-of-mass energies near the Z{sup 0} resonance (91.2 GeV). The preliminary chapters introduce the theoretical framework and the apparatus. A brief review is given of some features of Quantum Chromodynamics (QCD) that are relevant to the study. Two QCD-ba… more
Date: June 1, 1990
Creator: O'Shaughnessy, K.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Research program in particle physics

Description: This report discusses the following topics: Quantum Gravity and Mathematical Physics; Phenomenology; Quantum Mechanics and Quantum Field Theory; Status of BNL Expt. 791; BNL Expt. 791; BNL Expt. 888; and SSC Activities.
Date: July 1, 1992
Creator: Sudarshan, E.C.G.; Dicus, D.A.; Ritchie, J.L. & Lang, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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