Recent experimental results on the beam-beam effects in storage rings and an attempt of their interpretation (open access)

Recent experimental results on the beam-beam effects in storage rings and an attempt of their interpretation

The latest available experimental results on the luminosity, the space charge parameters, and the beam blowup as functions of particle energy and beam current are reviewed. The comparison with the phenomenological diffusion theory is done and useful scaling laws are derived. Some implications for anti p p storage rings are discussed.
Date: June 1, 1980
Creator: Kheifets, S.
System: The UNT Digital Library
Hot-electron-ring physics (open access)

Hot-electron-ring physics

Separate abstracts were prepared for each of the 16 included papers. (MOW)
Date: June 1, 1982
Creator: Uckan, N.A. (ed.)
System: The UNT Digital Library
Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC (open access)

Radiative corrections in SU/sub 2/ x U/sub 1/ LEP/SLC

We show the sensitivity of various experimental measurements to one-loop radiative corrections in SU/sub 2/ x U/sub 1/. Models considered are the standard GSW model as well as extensions of it which include extra quarks and leptons, SUSY and certain technicolor models. The observation of longitudinal polarization is a great help in seeing these effects in asymmetries in e/sup +/e/sup -/ ..-->.. ..mu../sup +/..mu../sup -/, tau/sup +/tau/sup -/ on Z/sup 0/ resonance. 25 refs., 22 figs., 10 tabs.
Date: June 1, 1985
Creator: Lynn, B. W.; Peskin, M. E. & Stuart, R. G.
System: The UNT Digital Library
Recent US target-physics-related research in heavy-ion inertial fusion: simulations for tamped targets and for disk experiments in accelerator test facilities (open access)

Recent US target-physics-related research in heavy-ion inertial fusion: simulations for tamped targets and for disk experiments in accelerator test facilities

Within the last few years, there have also appeared in the Heavy-Ion Fusion literature several studies of targets which have outer tampers. One-dimensional simulations indicate higher target gains with a judicious amount of tamping. But for these targets, a full investigation has not been carried through in regards to conservative criteria for fluid instabilities as well as reasonable imperfections in target fabrication and illumination symmetry which all affect target ignition and burn. Comparisons of these results with the gain survey of Part I would have to be performed with care. These calculations suggest that experiments relating to high temperature disk heating, as well as beam deposition, focusing and transport can be performed within the context of current design proposals for accelerator test-facilities. Since the test-facilities have lower ion kinetic energy and beam pulse power as compared to reactor drivers, we achieve high-beam intensities at the focal spot by using short focal distance and properly designed beam optics.
Date: June 24, 1982
Creator: Mark, J.W.K.
System: The UNT Digital Library
Geothermal power production: accidental fluid releases, waste disposal, and water use (open access)

Geothermal power production: accidental fluid releases, waste disposal, and water use

Environmental problems related to the use and disposal of fluids can accompany the operation of geothermal power plants using hot water resources (temperature > 150/sup 0/C). More than 100 kg of fluids must be extracted, processed, and disposed for each kW.h of electricity generated from a facility relying on a geothermal reservoir with fluids of 150/sup 0/C. The low thermal efficiencies of geothermal power plants result in large requirements for cooling water - over 7.4 x 10/sup 4/ m/sup 3//MW.y compared with 1.7 x 10/sup 4/ m/sup 3//MW.y for coal-fired plants. Geothermal fluids can contain as much as 250,000 mg/1 total dissolved solids. Toxic substances like boron and NH/sub 3/ are often present in fluids. This paper focuses on impacts associated with accidental releases of geothermal fluids as well as the disposal of liquid and solid wastes. The consequences of consuming alternative sources of cooling water are also addressed. Inadvertent discharges of fluids are of concern because they could contaminate soils and surface waters, adversely affecting crops and aquatic organisms. The pretreatment of fluids before subsurface injection could lead to solid waste problems - especially when toxic substances are produced. The consumption of alternative cooling waters can pose problems involving …
Date: June 1, 1980
Creator: Layton, D. W. & Morris, W. F.
System: The UNT Digital Library
Molecular ingredients of heterogeneous catalysis (open access)

Molecular ingredients of heterogeneous catalysis

The purpose of this paper is to present a review and status report to those in theoretical chemistry of the rapidly developing surface science of heterogeneous catalysis. The art of catalysis is developing into science. This profound change provides one with opportunities not only to understand the molecular ingredients of important catalytic systems but also to develop new and improved catalyst. The participation of theorists to find answers to important questions is sorely needed for the sound development of the field. It is the authors hope that some of the outstanding problems of heterogeneous catalysis that are identified in this paper will be investigated. For this purpose the paper is divided into several sections. The brief Introduction to the methodology and recent results of the surface science of heterogeneous catalysis is followed by a review of the concepts of heterogeneous catalysis. Then, the experimental results that identified the three molecular ingredients of catalysis, structure, carbonaceous deposit and the oxidation state of surface atoms are described. Each section is closed with a summary and a list of problems that require theoretical and experimental scrutiny. Finally attempts to build new catalyst systems and the theoretical and experimental problems that appeared in the …
Date: June 1, 1982
Creator: Somorjai, G.A.
System: The UNT Digital Library
Fractional charge search (open access)

Fractional charge search

A device to search for fractional charge in matter is described. The sample is coupled to a low-noise amplifier by a periodically varying capacitor and the resulting signal is synchronously detected. The varying capacitor is constructed as a rapidly spinning wheel. Samples of any material in volumes of up to 0.05 ml may be searched in less than an hour.
Date: June 1, 1982
Creator: Innes, W.; Klein, S.; Perl, M. & Price, J.C.
System: The UNT Digital Library
Probing nuclear matter with dileptons (open access)

Probing nuclear matter with dileptons

Dileptons are shown to be of interest in helping probe extreme conditions of temperature and density in nuclear matter. The current state of experimental knowledge about dileptons is briefly described, and their use in upcoming experiments with light ions at CERN SPS are reviewed, including possible signatures of quark matter formation. Use of dileptons in an upcoming experiment with a new spectrometer at Berkeley is also discussed. This experiment will probe the nuclear matter equation of state at high temperature and density. 16 refs., 8 figs. (LEW)
Date: June 1, 1986
Creator: Schroeder, L. S.
System: The UNT Digital Library
Design of neutron streak camera for fusion diagnostics (open access)

Design of neutron streak camera for fusion diagnostics

The D-T burn time for advanced laser-fusion targets is calculated to be very short, < 50 ps. We describe the design of a neutron streak camera of 16 ps resolving time that can be used to study the temporal history of fusion burn. The cathode of the neutron streak camera is sensitive to neutrons and is curved such that the difference in the neutron path lengths from a point source to various parts of the cathode is compensated by electron transit times within the streak tube. Thus the cathode can be made large for high sensitivity, without sacrificing time resolution. The cathode is coated with 1 ..mu..m UO/sub 2/. Each fission fragment leaving the cathode generates 400 secondary electrons that are all < 20 eV. These electrons are focussed to a point with an extractor and an anode, and are then purified with an electrostatic deflector. The electron beam is streaked and detected with the standard streak camera techniques. Careful shielding is needed for x-rays from the fusion target and general background. It appears that the neutron streak camera can be a viable and unique tool for studying temporal history of fusion burns in D-T plasmas of a few keV …
Date: June 1, 1982
Creator: Wang, C. L.; Kalibjian, R. & Singh, M. S.
System: The UNT Digital Library
Formation of a quark-gluon plasma in nuclear collisions (open access)

Formation of a quark-gluon plasma in nuclear collisions

The spatial dependence of the energy deposition in the fragmentation regions is estimated for nuclear collisions at ISR energies, ..sqrt..s/A >approx. 30 GeV/nucleon. Two models (the trailing cascade and sequential decay scenarios) are contrasted. The results are compared to the quark-gluon plasma energy density computed via QCD lattice methods.
Date: June 1, 1982
Creator: Gyulassy, M.
System: The UNT Digital Library
Thermal reactor safety (open access)

Thermal reactor safety

Information is presented concerning new trends in licensing; seismic considerations and system structural behavior; TMI-2 risk assessment and thermal hydraulics; statistical assessment of potential accidents and verification of computational methods; issues with respect to improved safety; human factors in nuclear power plant operation; diagnostics and activities in support of recovery; LOCA transient analysis; unresolved safety issues and other safety considerations; and fission product transport.
Date: June 1, 1980
Creator: unknown
System: The UNT Digital Library
Scale transformations, the energy-momentum tensor, and the equation of state (open access)

Scale transformations, the energy-momentum tensor, and the equation of state

The Equation of State (EOS) relates diagonal elements of the energy-momentum tensor {theta}{sub {mu}{nu}}. The first moment of the energy-momentum tensor generates scale transformations. The virial theorem, a consequence of the behavior of the energy density under scale transformations, allows one to eliminate the kinetic energy in terms of the potential terms. The trace theorem for the energy-momentum tensor expresses {epsilon}-3p in terms of ensemble averages of scale-breaking operators, allowing a new approach to the EOS. 10 refs.
Date: June 1989
Creator: Carruthers, P.
System: The UNT Digital Library
Lack of immediate effects from the 1979-80 Imperial and Victoria earthquakes on the exploited Cerro Prieto geothermal reservoir (open access)

Lack of immediate effects from the 1979-80 Imperial and Victoria earthquakes on the exploited Cerro Prieto geothermal reservoir

In 1979-1980 two large earthquakes of local magnitude (M/sub L/) greater than 6.0 occurred near the Cerro Prieto geothermal field. It has been suggested that related to these seismic events there was an abrupt temperature increase in the wells completed in the shallow (alpha) reservoir. A careful study of the geochemistry of the produced fluids, as well as a cursory reservoir engineering analysis, cannot confirm either the data or the hypothesis of a massive influx of hot water into the system related to those events. Our study shows that the cold water recharge of the alpha reservoir in response to the production-induced drawdown continued, unaffected by the two earthquakes.
Date: June 1, 1986
Creator: Truesdell, A.H. & Lippmann, M.J.
System: The UNT Digital Library
Numerical studies of gravity effects in two-phase reservoirs (open access)

Numerical studies of gravity effects in two-phase reservoirs

Numerical studies are performed to investigate the effects of localized feed zones on the pressure transients in two-phase reservoirs. It is shown that gravity effects can significantly affect the pressure transients, because of the large difference in the density of liquid water and vapor. Pressure transients for shallow and deep feed zones and the resulting fluid flow patterns are discussed.
Date: June 1, 1986
Creator: Bodvarsson, G.S. & Cox, B.L.
System: The UNT Digital Library
Electrical Conductivity Measurements in Shock Compressed Liquid Nitrogen (open access)

Electrical Conductivity Measurements in Shock Compressed Liquid Nitrogen

The electrical conductivity of shock compressed liquid nitrogen was measured in the pressure range 20 to 50 GPa using a two-stage light-gas gun. The conductivities covered a range 4 x 10/sup -2/ to 1 x 10/sup 2/ ohm/sup -1/ cm/sup -1/. The data are discussed in terms of a liquid semiconductor model below the onset of the dissociative phase transition at 30 GPa. 15 refs., 1 fig.
Date: June 1, 1985
Creator: Hamilton, D. C.; Mitchell, A. C. & Nellis, W. J.
System: The UNT Digital Library
Thermal Reactor Safety (open access)

Thermal Reactor Safety

Information is presented concerning fire risk and protection; transient thermal-hydraulic analysis and experiments; class 9 accidents and containment; diagnostics and in-service inspection; risk and cost comparison of alternative electric energy sources; fuel behavior and experiments on core cooling in LOCAs; reactor event reporting analysis; equipment qualification; post facts analysis of the TMI-2 accident; and computational methods.
Date: June 1, 1980
Creator: unknown
System: The UNT Digital Library
Three-dimensional thermal analysis of a baseline spent fuel repository (open access)

Three-dimensional thermal analysis of a baseline spent fuel repository

A three-dimensional thermal analysis has been performed using finite difference techniques to determine the near-field response of a baseline spent fuel repository in a deep geologic salt medium. A baseline design incorporates previous thermal modeling experience and OWI recommendations for areal thermal loading in specifying the waste form properties, package details, and emplacement configuration. The base case in this thermal analysis considers one 10-year old PWR spent fuel assembly emplaced to yield a 36 kw/acre (8.9 w/m/sup 2/) loading. A unit cell model in an infinite array is used to simplify the problem and provide upper-bound temperatures. Boundary conditions are imposed which allow simulations to 1000 years. Variations studied include a comparison of ventilated and unventilated storage room conditions, emplacement packages with and without air gaps surrounding the canister, and room cool-down scenarios with ventilation following an unventilated state for retrieval purposes. At this low power level ventilating the emplacement room has an immediate cooling influence on the canister and effectively maintains the emplacement room floor near the temperature of the ventilating air. The annular gap separating the canister and sleeve causes the peak temperature of the canister surface to rise by 10/sup 0/F (5.6/sup 0/C) over that from a …
Date: June 5, 1980
Creator: Altenbach, T.J. & Lowry, W.E.
System: The UNT Digital Library
Ratio of D/sup 0/ and D/sup +/ lifetimes from their semileptonic decays (open access)

Ratio of D/sup 0/ and D/sup +/ lifetimes from their semileptonic decays

The conventional expectation for the decays of D mesons assumes that the charm quark decays in the presence of light, spectator quarks and thus the lifetimes of both charged and uncharged states are equal. In this article, evidence is presented from DELCO (at SPEAR) that the D lifetimes are quite different for neutral and charged mesons, and the results which have also become available from other experiments are reviewed.
Date: June 1, 1980
Creator: Donaldson, G.J.
System: The UNT Digital Library
Slope Parameter for the Differential Cross-Section for the Reaction p + d. -->. X + d in the Region of Small Momentum Transfer at Fermilab Energies (open access)

Slope Parameter for the Differential Cross-Section for the Reaction p + d. -->. X + d in the Region of Small Momentum Transfer at Fermilab Energies

A deuterium gas jet target was used in the circulating beam of the Fermilab accelerator to study the M/sup 2//sub x/ and s dependence and the slope parameter for pd ..-->.. Xd in the region 0.025 less than or equal to vertical bar t vertical bar less than or equal to 0.17 (GeV/c)/sup 2/ and 5 less than or equal to M/sup 2//sub x/ less than or equal to 0.068s GeV/sup 2/. A simple parametrization in terms of the variable (1 - x) is found.
Date: June 1, 1980
Creator: Akimov, Yu. K.; Bartenev, V. D. & Izyurov, V. M.
System: The UNT Digital Library
Analysis of the mist lift process for mist flow open-cycle OTEC (open access)

Analysis of the mist lift process for mist flow open-cycle OTEC

Preliminary results are presented of a numerical analysis to study the open-cycle mist flow process for ocean thermal energy conversion (OTEC). Emphasis in the analysis is on the mass transfer and fluid mechanics of the steady-state mist flow. The analysis is based on two one-dimensional models of the mist lift process: a single-group model describes a mist composed of a single size of drops and a multigroup model considers a spectrum of drop sizes. The single-group model predicts that the lift achieved in the mist lift process will be sensitive to the inlet parameters. Under conditions that lead to maximum lift in the model for a single drop size, the multigroup model predicts significantly reduced performance. Because the growth of drops is important, sensitivity of the predicted performance of the mist lift to variations in the collision parameters has been studied.
Date: June 1, 1980
Creator: Davenport, R. L.
System: The UNT Digital Library
Selected results from the Mark II at SPEAR (open access)

Selected results from the Mark II at SPEAR

Recent results on radiative transitions from the psi(3095), charmed meson decay, and the Cabibbo-suppressed decay tau ..-->.. K* ..nu../sub tau/ are reviewed. The results come primarily from the Mark II experiment at SPEAR, but preliminary results from the Crystal Ball experiment on psi radiative transitions are also discussed.
Date: June 1, 1980
Creator: Scharre, D.L.
System: The UNT Digital Library
PEP instrumentation and control system (open access)

PEP instrumentation and control system

This paper describes the operating characteristics of the primary components that form the PEP Instrumentation and Control System. Descriptions are provided for the computer control system, beam monitors, and other support systems.
Date: June 1, 1980
Creator: Melen, R.
System: The UNT Digital Library
Personal extrapolation of CDF test beam use to the SSC (open access)

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 shared by several groups. (LEW)
Date: June 23, 1986
Creator: Nodulman, L.
System: The UNT Digital Library
Indoor air quality measurements in 38 Pacific Northwest commercial buildings (open access)

Indoor air quality measurements in 38 Pacific Northwest commercial buildings

A Bonneville Power Administration-funded study monitored ventilation rates and a variety of indoor air pollutants in 38 Pacific Northwest commercial buildings. The buildings ranged in age from 6 months to 90 years, in size from 864 to 34,280 m/sup 2/, and occupancy from 25 to 2500 people. Building average formaldehyde (HCHO) concentrations were below the 20 ppB detection limit in 48% of the buildings. Nitrogen dioxide (NO/sub 2/) concentration averages ranged from 5 ppB to 43 ppB and were lower than outdoor concentrations in 8 of 13 buildings. At only one site, an elementary school classroom, did carbon dioxide (CO/sub 2/) exceed 1000 ppM. Radon (Rn) levels were elevated in one building with an average concentration of 7.4 pCiL/sup -1/. Respirable particles (RSP) concentrations in smoking areas in 32 buildings had a geometric mean of 44 ..mu..g m/sup -3/ and ranged up to 308 ..mu..g m/sup -3/ at one site. In non-smoking areas the geometric mean RSP was 15 ..mu..g m/sup -3/. Outside air ventilation rates did not appear to be the single dominant parameter in determining indoor pollutant concentrations. Measured pollutant concentrations in 2 ''complaint'' buildings were below accepted guidelines. The cause of the complaints was not identified.
Date: June 1, 1986
Creator: Turk, B. H.; Brown, J. T.; Geisling-Sobotka, K.; Froehlich, D. A.; Grimsrud, D. T.; Harrison, J. et al.
System: The UNT Digital Library