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Description of the National Highway Planning Network

Description: The National Highway Planning Network is a data base of major highways in the continental United States. It is a foundation for analytic studies of highway performance, for vehicle routing and scheduling problems, and for mapping purposes. The network is based on a set of roadways digitized from the National Atlas by the US Geological Survey. It has been enhanced at Oak Ridge National Laboratory by adding additional roads and attribute detail and correcting topological errors to produce a true … more
Date: September 1, 1990
Creator: Peterson, B.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Trigger processor for the APEX experiment at Argonne

Description: An electron-positron spectrometer is being constructed at Argonne to search for correlated pairs emitted after heavy ion collisions. The trigger for this experiment requires the detection of a positron in either arm of the spectrometer. We describe the trigger for the experiment which selects events with positron annihilation radiation detected in an array of NaI crystals. 1 ref., 3 figs.
Date: January 1, 1990
Creator: Dawson, J.W.; Freedman, S.J. & Haberichter, W.N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Status and preliminary performance with cosmic data of the warm iron calorimeter in SLD

Description: The SLD is an e{sup +}e{sup {minus}} detector optimized for Z{sup 0} physics, and is approaching completion at the Stanford Linear Accelerator Center (SLAC). The Warm Iron Calorimeter (WIC) is a device built using limited streamer tubes to instrument the magnet yoke, and has double purpose: it will measure the energy of tails of hadronic showers escaping from the Liquid Argon Calorimeter (the main instrument of SLD calorimetry) and the coil, and it will also be used as a muon identifier and tra… more
Date: November 1, 1990
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computer controlled MHD power consolidation and pulse generation system

Description: The major goal of this research project is to establish the feasibility of a power conversion technology which will permit the direct synthesis of computer programmable pulse power. Feasibility has been established in this project by demonstration of direct synthesis of commercial frequency power by means of computer control. The power input to the conversion system is assumed to be a Faraday connected MHD generator which may be viewed as a multi-terminal dc source and is simulated for the purp… more
Date: January 1, 1990
Creator: Johnson, R.; Marcotte, K. & Donnelly, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Elementary particle physics---Experimental

Description: We are continuing a research program in high energy experimental particle physics and particle astrophysics. Studies of high energy hadronic interactions were performed using several techniques, in addition, a high energy leptoproduction experiment was continued at the Fermi National Accelerator Laboratory. We are participants in a joint US/Japan program to study nuclear interactions at energies two orders of magnitude greater than those of existing accelerators. The data are being collected wi… more
Date: September 20, 1990
Creator: Lord, J.J.; Burnett, T.H. & Wilkes, R.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Triggering GaAs lock-on switches with laser diode arrays

Description: Many of the applications that require the unique capabilities of Photoconductive Semiconductor Switches (PCSS) demand a compact package. We have been able to demonstrate that GaAs switches operated in the high gain mode called lock-on'' meet the required electrical switching parameters of several such applications using small switch sizes. The only light source that has enough power to trigger a PCSS and is compatible with a small package is a laser diode. This paper will describe the progress … more
Date: January 1, 1990
Creator: Loubriel, G. M.; Helgeson, W. D.; McLaughlin, D. L.; O'Malley, M. W.; Zutavern, F. J.; Rosen, A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary results from E665 on cross-section ratios at low x sub bj using H sub 2 , D sub 2 and Xe targets

Description: Fermilab experiment 665 has taken deep-inelastic muon scattering data at a beam energy of 490 GeV/c, on H{sub 2}, D{sub 2} and Xe targets. Two triggers have been used: a large scattering-angle trigger (LAT), sensitive to a minimum scattering angle of 3 mrad, and a small scattering-angle trigger which can accept a scattering angle down to 0.5 mrad. The neutron to proton ratio is reported for x{sub bj} above 0.002, and it shows consistency with 1 as x{sub bj} goes to 0. The Xe to D{sub 3} cross-s… more
Date: June 1, 1990
Creator: Aied, S. (Maryland Univ., College Park, MD (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Top quark and SUSY (supersymmetric) searches at CDF

Description: Searches for the top quark in p{bar p} collisions at {radical}s = 1.8 TeV are described. The analyses are based on data with an integrated luminosity of 4.4 pb{sup {minus}1} recorded with the Collider Detector at Fermilab in the 1988--1989 run. An upper limit on the t{bar t} cross section is obtained. The top quark with mass below 89 GeV/c{sup 2} is excluded at the 95% CL. Prospects for searches for the top quark in the future are presented. We also briefly present results on searches for super… more
Date: May 17, 1990
Creator: Yeh, G.P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Xe/D sub 2 cross-section ratios at low X sub Bj from muon scattering at 490 GeV/c

Description: First measurements from the E665 experiment at Fermilab on the relative cross-sections of 490 GeV/c muons scattered from deuterium and xenon targets are presented. The scattered muons were in the kinetic range Q{sup 2} > 0.1(GeV/c){sup 2} and very low x{sub Bj} (0.001 < x{sub Bj} < 0.1). Triggering on events in this kinematic region was accomplished with a special Small Angle Trigger which projected individual beam muons to form a veto region 30 meters from the target. Using this trigger, muons… more
Date: June 1990
Creator: Magill, Stephen R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An alpha/beta/gamma health physics instrument with pulse-shape discrimination

Description: A recent breakthrough in alpha scintillation detector design supports the feasibility of extending this new technology to the development of a monolithic alpha/beta/gamma ({alpha}/{beta}/{gamma}) scintillation detector. The new scintillator is physically robust and chemically resistant to environmental conditions encountered in radiation monitoring, and yet inexpensive to manufacture. The use of pulse-shape discrimination electronics allows pulses from each scintillator to be separated for part… more
Date: January 1, 1990
Creator: McElhaney, S. A.; Chiles, M. M. & Ramsey, J. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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(The 1990 run of the WA80 experiment)

Description: The traveler spent six weeks at CERN participating in the 1990 run of the WA80 experiment. The traveler concentrated on trigger electronics for the first two weeks and on operation of the experiment for much of the next four. New electronics designed at ORNL for reading out the new BGO spectrometer were tested with the BGO in beam. Improvements were made, in collaboration with the ORNL engineers who designed the electronics. Plans were made for constructing the electronics in large quantities. … more
Date: September 18, 1990
Creator: Young, G. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Progress report of a research program in experimental high energy physics

Description: An experimental program in strong and electro-weak interaction physics of elementary particles is being carried out using electronic detection techniques. Experiments have been performed at Brown, Brookhaven, and Fermilab. The work described in this report by the Electronic Detector Group addresses the following: neutrino interactions and intrinsic properties, preparations for experiments ( D--ZERO'') at the FNAL 2 TeV {bar p}p Collider, new detection techniques for neutrino properties.
Date: July 1, 1990
Creator: Lanou, R.E. Jr. & Cutts, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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VISAR (Velocity Interferometer System for Any Reflector): Line-imaging interferometer

Description: This paper describes a Velocity Interferometer System for Any Reflector (VISAR) technique that extends velocity measurements from single points to a line. Single-frequency argon laser light was focused through a cylindrical lens to illuminate a line on a surface. The initially stationary, flat surface was accelerated unevenly during the experiment. Motion produced a Doppler-shift of light reflected from the surface that was proportional to the velocity at each point. The Doppler-shifted image o… more
Date: January 1, 1990
Creator: Hemsing, W. F.; Mathews, A. R.; Warnes, R. H. & Whittemore, G. R.
Item Type: Refine your search to only Article
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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D0 data acquisition: High speed data paths for D0

Description: This poster is intended as a review of the Level-2 system architecture for D0, and to provide an overview of the new generation of hardware currently under development to accomplish these functions. Several operational prototypes of the system have been built and are currently in use for detector and software development, as well as cosmic ray and test beam data acquisition. Delivery of the first half of the acquisition system is scheduled for September 1990, to be used in the commissioning of … more
Date: January 1, 1990
Creator: Cutts, D.; Hoftun, J. S.; Nesic, D. (Brown Univ., Providence, RI (USA). Dept. of Physics); Johnson, C. R. & Zeller, R. T. (Zeller Research Ltd., Cranston, RI (USA))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A data acquisition architecture for the SSC

Description: An SSC data acquisition architecture applicable to high-p{sub T} detectors is described. The architecture is based upon a small set of design principles that were chosen to simplify communication between data acquisition elements while providing the required level of flexibility and performance. The architecture features an integrated system for data collection, event building, and communication with a large processing farm. The interface to the front end electronics system is also discussed. A… more
Date: January 1, 1990
Creator: Partridge, R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Computing and data handling requirements for SSC (Superconducting Super Collider) and LHC (Large Hadron Collider) experiments

Description: A number of issues for computing and data handling in the online in environment at future high-luminosity, high-energy colliders, such as the Superconducting Super Collider (SSC) and Large Hadron Collider (LHC), are outlined. Requirements for trigger processing, data acquisition, and online processing are discussed. Some aspects of possible solutions are sketched. 6 refs., 3 figs.
Date: May 1, 1990
Creator: Lankford, A.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Precision pulse-timing instrumentation for ultrasonic nondestructive testing

Description: A new, pulse-timing discriminator and B-scan time-to-pulse-height converter have been developed for the inspection of production parts. The discriminator is easy to operate and features automatic echo gating and automatic pulse polarity discrimination. This instrument combines the noise-blanking advantages of threshold discrimination with the echo-timing precision of zero-crossing discrimination to improve measurement accuracy by a factor of two over the best precious techniques. When used with… more
Date: August 31, 1990
Creator: Duncan, M. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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EMPACT: Electrons Muons Partons with Air Core Toroids

Description: The EMPACT experiment utilizes a broad approach to maximize its discovery potential for new phenomena accessible at the SSC. The high resolution detector has a balances emphasis on, and large acceptance for, electrons, muons, jets, and noninteracting particles, and is capable of utilizing the ultimate luminosity of the SSC. The detector emphasizes excellent calorimetry augmented by TRD tracking, and employs an innovative system of superconducting air core toroids for muon measurements. Signific… more
Date: May 25, 1990
Creator: Marx, M. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Triggering GaAs lock-on switches with laser diode arrays

Description: Laser diode arrays have been used to trigger GaAs Photoconducting Semiconductor Switches (PCSS) charged to voltages of up to 60 kV and conducting currents of 580 A. The driving forces behind the use of laser diode arrays are compactness, elimination of complicated optics, and the ability to run at high repetition rates. Laser diode arrays are compactness, elimination of complicated optics, and the ability to run at high repetition rates. Laser diode arrays can trigger GaAs at high fields as the… more
Date: January 1, 1990
Creator: Loubriel, G. M.; Buttram, M. T.; Helgeson, W. D.; McLaughlin, D. L.; O'Malley, M. W.; Zutavern, F. J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SLED II: A new method of rf pulse compression

Description: In the SLED method of RF pulse compression, two high Q resonators store energy from an RF source for a relatively long time interval (typically 3 to 5 {mu}sec). Triggered by a reversal in RF phase, this stored energy is then released during a much shorter interval equal to the filling time of the accelerating structure. A peak power gain on the order of three and a compression efficiency on the order of 60% are typically attained. The shape of the output pulse is, however, a sharply decaying ex… more
Date: September 1, 1990
Creator: Wilson, P. B.; Farkas, Z. D. & Ruth, R. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of Various Event Building Techniques on Data Acquisition System Architectures

Description: The preliminary specifications for various new detectors throughout the world including those at the Superconducting Super Collider (SSC) already make it clear that existing event building techniques will be inadequate for the high trigger and data rates anticipated for these detectors. In the world of high-energy physics many approaches have been taken to solving the problem of reading out data from a whole detector and presenting a complete event to the physicist, while simultaneously keeping… more
Date: April 1990
Creator: Barsotti, Ed; Booth, Alexander & Bowden, Mark
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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