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Measuring the mass and width of the Z sup 0 : The status of the energy spectrometers

Description: The Stanford Linear Collider (SLC) located at the Stanford Linear Accelerator Center (SLAC) collides electrons and positrons produced in the linear accelerator pulse by pulse. The object is to produce collisions energetic enough to produce the heavy intermediate vector boson, the Z{sup 0}. An essential component of the SLC physics program is the precise knowledge of the center-of-mass energy of each interaction. We measure the energy of each collision by using two energy spectrometers. The spec… more
Date: May 1, 1989
Creator: Rouse, F.; Levi, M. (Lawrence Berkeley Lab., CA (United States)); Kent, J.; King, M.; Von Zanthier, C.; Watson, S. (California Univ., Santa Cruz, CA (United States)) et al.
Partner: UNT Libraries Government Documents Department
open access

Whole facility energy use monitoring

Description: Pacific Northwest Laboratory (PNL) is conducting numerous field monitoring studies of the induces of energy in buildings. Energy use monitoring techniques have been developed to provide reliable empirical measurements of energy consumption according to enduse and time of day. These measurements are analyzed in conjunction with climate and site characteristics data to determine energy use efficiencies and identify energy conservation and load management opportunities. This paper draws upon this … more
Date: May 1, 1989
Creator: Mazzucchi, R.P. & Jo, J.
Partner: UNT Libraries Government Documents Department
open access

Early Admission to College for Bright Students

Description: Article discussing the early admission to college programs, including the Texas Academy of Mathematics and Science.
Date: May 17, 1989
Creator: Cromer, Alan
Partner: Texas Academy of Mathematics and Science
open access

Gas flow in and out of a nuclear waste container

Description: We analyze the flow of gases out of and into a high-level-waste container in the unsaturated tuff of Yucca Mountain. Containers are expected to fail eventually by localized cracks and penetrations. Even though the penetrations may be small, argon gas initially in the hot container can leak out. As the waste package cools, the pressure inside the container can become less than atmospheric, and air can leak in. {sup 14}C released from the hot fuel-cladding surface can leak out of penetrations, an… more
Date: May 1, 1989
Creator: Zwahlen, E. D.; Pigford, T. H.; Chambre, P. L. & Lee, W. W. L.
Partner: UNT Libraries Government Documents Department
open access

The soudan 2 experiment

Description: Soudan 2 is an 1100-ton tracking calorimeter which is being constructed to search for nucleon decay. The detector consists of finely segmented iron instrumented with drift tubes, and records three spatial coordinates and dE/dx for every gas crossing. Excellent event-reconstruction capability, particle identification, and muon sign and direction determination give superior rejection of the neutrino background to nucleon decay in many modes. The first 275 tons of Soudan 2 is operating and a charg… more
Date: May 25, 1989
Creator: Ayres, D.S.
Partner: UNT Libraries Government Documents Department
open access

Nonplanar machines

Description: This talk examines methods available to minimize, but never entirely eliminate, degradation of machine performance caused by terrain following. Breaking of planar machine symmetry for engineering convenience and/or monetary savings must be balanced against small performance degradation, and can only be decided on a case-by-case basis. 5 refs.
Date: May 1, 1989
Creator: Ritson, D. (Stanford Linear Accelerator Center, Menlo Park, CA (USA))
Partner: UNT Libraries Government Documents Department
open access

Saturating interactions in /sup 4/He with density dependence

Description: With the advent of larger and faster computers, as well as modern shell model codes, nuclear structure calculations for the light nuclei (A<16) which include full 2/bar h/..omega.. model spaces are quite feasible. However, there can be serious problems in the mixing of 2/bar h/..omega.. and higher excitations into the low-lying spectra if the effective interaction is non-saturating. Furthermore, effective interactions which are both saturating and density dependent have not generally been used … more
Date: May 3, 1989
Creator: Bloom, S.D.; Resler, D.A. & Moszkowski, S.A.
Partner: UNT Libraries Government Documents Department
open access

Modeling of LH current drive in self-consistent elongated tokamak MHD equilibria

Description: Calculations of non-inductive current drive typically have been used with model MHD equilibria which are independently generated from an assumed toroidal current profile or from a fit to an experiment. Such a method can lead to serious errors since the driven current can dramatically alter the equilibrium and changes in the equilibrium B-fields can dramatically alter the current drive. The latter effect is quite pronounced in LH current drive where the ray trajectories are sensitive to the loca… more
Date: May 9, 1989
Creator: Blackfield, D. T.; Devoto, R. S.; Fenstermacher, M. E.; Bonoli, P. T.; Porkolab, M. & Yugo, J.
Partner: UNT Libraries Government Documents Department
open access

Proceedings of the DOE workshop on the role of a high-current accelerator in the future of nuclear medicine

Description: The meeting was prompted by recent problems with isotope availability from DOE accelerator facilities; these difficulties have resulted from conflicting priorities between physics experiments and isotope production activities. The workshop was a forum in which the nuclear medicine community, isotope producers, industry, and other interested groups could discuss issues associated with isotope availability (including continuous supply options), the role of DOE and industry in isotope production, … more
Date: May 1, 1989
Creator: Moody, D.C. & Peterson, E.J. (comps.)
Partner: UNT Libraries Government Documents Department
open access

Optimum launching of electron-cyclotron power for localized current drive in a hot tokamak

Description: Optimum launch parameters are determined for localized electron-cyclotron current drive near the magnetic axis and the q=2 surface by solving several minimization problems. For central current drive, equatorial and bottom launch are compared. Localized current drive near q=2 is studied for equatorial launch and for an alternative outside launch geometry that may be better for suppressing tearing modes and controlling disruptions. 6 refs., 2 figs.
Date: May 1, 1989
Creator: Smith, G. R.
Partner: UNT Libraries Government Documents Department
open access

What do we know (and how) about the CKM (Cabibbo-Kobayashi-Maskawa) matrix

Description: The way from an experimental measurement to the numerical value for a CKM matrix element is described. How do we choose the appropriate model. What are the uncertainties involved. Where should we direct our future efforts. How do loop processes help us. Finally we describe the state of the art of our knowledge of the CKM matrix. 6 refs.
Date: May 1, 1989
Creator: Nir, Y.
Partner: UNT Libraries Government Documents Department
open access

HREM at orthogonal projections of GaAs islands on silicon

Description: HREM studies typically examine only one projection of a structure and information in the electron beam direction is lost. In most cases, the structure in this direction is uniform and already known, but in others a second projection needs to be observed. This could involve preparing a second specimen sectioned at right angles to the first, or as described here, tilting a specimen through /plus minus/45/degree/ and observing the same volume in orthogonal projections. The specimen used here was o… more
Date: May 1, 1989
Creator: Ponce, F.A. & Hetherington, C.J.D.
Partner: UNT Libraries Government Documents Department
open access

The standard model and beyond

Description: The field of elementary particle, or high energy, physics seeks to identify the most elementary constituents of nature and to study the forces that govern their interactions. Increasing the energy of a probe in a laboratory experiment increases its power as an effective microscope for discerning increasingly smaller structures of matter. Thus we have learned that matter is composed of molecules that are in turn composed of atoms, that the atom consists of a nucleus surrounded by a cloud of elec… more
Date: May 1, 1989
Creator: Gaillard, M. K.
Partner: UNT Libraries Government Documents Department
open access

Software for FASTBUS and Motorola 68K based readout controllers for data acquisition

Description: Many High Energy Physics experiments at Fermilab are now including FASTBUS front-ends in their data acquisition systems. The requirements on controllers to readout and control these FASTBUS systems are increasing in complexity and speed. The Data Acquisition Software group has designed general software for front end 68K processor boards housed in FASTBUS or VME to meet these needs. The first implementation has been developed for the General Purpose FASTBUS Master (GPM). This software is being p… more
Date: May 1, 1989
Creator: Pordes, R.; Bernett, M.; Dorries, T.; Haire, M.; Moore, C.; Oleynik, G. et al.
Partner: UNT Libraries Government Documents Department
open access

CP violation in K decays

Description: Recent theoretical and experimental progress on the manifestation of CP violation in K decays, and toward understanding whether CP violation originates in a phase, or phases, in the weak mixing matrix of quarks is reviewed. 23 refs., 10 figs.
Date: May 1, 1989
Creator: Gilman, Frederick J.
Partner: UNT Libraries Government Documents Department
open access

Quantum mechanical stabilization of Minkowski signature wormholes

Description: When one attempts to construct classical wormholes in Minkowski signature Lorentzian spacetimes violations of both the weak energy hypothesis and averaged weak energy hypothesis are encountered. Since the weak energy hypothesis is experimentally known to be violated quantum mechanically, this suggests that a quantum mechanical analysis of Minkowski signature wormholes is in order. In this note I perform a minisuperspace analysis of a simple class of Minkowski signature wormholes. By solving the… more
Date: May 19, 1989
Creator: Visser, M.
Partner: UNT Libraries Government Documents Department
open access

A new method of determining SIN/sup 2/ /theta//sub W/ in deep-inelastic /nu//sub mu/N scattering

Description: The value of sin /sup 2//theta//sub W/ can be determined to /plus minus/0.002 /minus/ 0.004 by using the semileptonic decays of the K/sub L/to provide a beam of /nu//sub /mu// and /bar /nu///sub /mu// and measuring the ratio R/prime/ = /sigma/(/bar /nu///sub /mu//, NC)//sigma/(/nu//sub /mu//, NC). Systematic errors which have limited the world-average of previous /nu//sub /mu//N determinations of sin/theta//sub W/ to /plus minus/0.008 are largely eliminated. This experiment will determine the r… more
Date: May 1, 1989
Creator: Bernstein, R.H.
Partner: UNT Libraries Government Documents Department
open access

Machines for lattice gauge theory

Description: The most promising approach to the solution of the theory of strong interactions is large scale numerical simulation using the techniques of lattice gauge theory. At the present time, computing requirements for convincing calculations of the properties of hadrons exceed the capabilities of even the most powerful commercial supercomputers. This has led to the development of massively parallel computers dedicated to lattice gauge theory. This talk will discuss the computing requirements behind th… more
Date: May 1, 1989
Creator: Mackenzie, P.B.
Partner: UNT Libraries Government Documents Department
open access

Role of alpha particle damping in fast wave current drive and heating

Description: The impact of energetic alpha particle wave absorption on the range of frequencies for efficient fast wave current drive and heating in a fusion reactor is investigated. The energetic alpha damping decrement is calculated, using a slowing down distribution function, and compared to electron and fuel ion damping over a wide range of frequencies. A combination of strong alpha damping and edge electron absorption in the higher ion harmonic regime limits core fast wave current drive to the lower ha… more
Date: May 1, 1989
Creator: Mau, T.K.
Partner: UNT Libraries Government Documents Department
open access

Higgs boson hunting

Description: This is the summary report of the Higgs Boson Working Group. We discuss a variety of search techniques for a Higgs boson which is lighter than the Z. The processes K /yields/ /pi/H, /eta//prime/ /yields/ /eta/H,/Upsilon/ /yields/ H/gamma/ and e/sup +/e/sup /minus// /yields/ ZH are examined with particular attention paid to theoretical uncertainties in the calculations. We also briefly examine new features of Higgs phenomenology in a model which contains Higgs triplets as well as the usual doubl… more
Date: May 1, 1989
Creator: Dawson, S.; Haber, H.E. & Rindani, S.D.
Partner: UNT Libraries Government Documents Department
open access

High level language memory management on parallel architectures

Description: HEP memory management packages such as YBOS and ZEBRA have been implemented and are currently running on a variety of mainframe computers. These packages were originally designed to run on single CPU engines. Implementation of these packages on parallel machines, loosely or tightly coupled architectures is discussed. ZEBRA (CERN package) on ACP (Fermilab) is presented in detail. Design of memory management system for the new generation of ACP systems or similar parallel architectures are presen… more
Date: May 1, 1989
Creator: Lebrun, P. & Kreymer, A.
Partner: UNT Libraries Government Documents Department
open access

Heavy ion development at the LBL (Lawrence Berkeley Laboratory) 88-inch cyclotron

Description: The 88-Inch Cyclotron produces a wide range of ions for basic and applied research. The 6.4 GHz ECR source has completely replaced the PIG source, giving higher charge states and higher cyclotron energies. The ECR source has produced ions of 34 elements, of which 28 have been accelerated in the cyclotron, using gases, and low and high temperature ovens. A higher frequency 14.5 GHz advanced ECR is now under construction. It will further increase the charge states and energies available. A concep… more
Date: May 1, 1989
Creator: Clark, D. J. & Lyneis, C. M.
Partner: UNT Libraries Government Documents Department
open access

A symplectic coherent beam-beam model

Description: We consider a simple one-dimensional model to study the effects of the beam-beam force on the coherent dynamics of colliding beams. The key ingredient is a linearized beam-beam kick. We study only the quadrupole modes, with the dynamical variables being the 2nd-order moments of the canonical variables q, p. Our model is self-consistent in the sense that no higher order moments are generated by the linearized beam-beam kicks, and that the only source of violation of symplecticity is the radiatio… more
Date: May 1, 1989
Creator: Furman, M. A.
Partner: UNT Libraries Government Documents Department
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