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in subjects: "Computerized Simulation"

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Numerical simulation of a short RFQ resonator using the MAFIA codes

The electrical characteristics of a short (2{beta}{lambda}=0.4 m) resonator with large modulation (m=4) have been studied using the three dimensional codes, MAFIA. The complete resonator, including the modulated electrodes and a complex support structure, has been simulated using {approximately} 350,000 mesh points. Important characteristics studied include the resonant frequency, electric and magnetic fields distributions, quality factor and stored energy. The results of the numerical simulati… more

Date: January 1, 1991

Creator: Wang, H.; Ben-Zvi, Ilan; Jain, A.; Paul, P. (State Univ. of New York, Stony Brook, NY (United States). Dept. of Physics) & Lombardi, A. (Istituto Nazionale di Fisica Nucleare, Legnaro (Italy). Lab. Nazionale di Legnaro)

Item Type: Article

Partner: UNT Libraries Government Documents Department

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INEX simulations of the optical performance of the AFEL

The AFEL (Advanced Free-Electron Laser) Project at Los Alamos National Laboratory is presently under construction. The project's goal is to produce a very high-brightness electron beam which will be generated by a photocathode injector and a 20 MeV rf-linac. Initial laser experiments will be performed with a 1-cm-period permanent magnet wiggler which will generate intense optical radiation near a wavelength of 3.7 {mu}m. Future experiments will operate with slotted-tube'' electromagnetic wiggle… more

Date: January 1, 1991

Creator: Goldstein, J.C.; Wang, T.S.F. & Sheffield, R.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Development of a mathematical model of a packed column for benzene removal from salt solutions

A mathematical model of a packed column was developed to describe the removal of benzene from radioactive salt solutions at the Savannah River Site. The model was developed from existing, generalized mass transfer correlations for randomly dumped packing, and the correlations were adapted for structured packing. Thermophysical data specific to the solutions of interest were incorporated into the model. Verification of the code was completed using operating data from stripping columns at other l… more

Date: January 1, 1989

Creator: Georgeton, G.K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Generation of coherent soft x-rays using a single-pass free-electron laser amplifier

We consider a single-pass free-electron laser (FEL) amplifier, driven by an rf-linac followed by a damping ring for reduced emittance, for use in generating coherent light in the soft x-ray region. The dependence of the optical gain on electron-beam quality, studied with the three-dimensional FEL simulation code FELEX, is given and related to the expected power of self-amplified spontaneous emission. We discuss issues for the damping ring designed to achieve the required electron beam quality. … more

Date: January 1, 1987

Creator: Wang, T. F.; Goldstein, J. C.; Newmam, B. E. & McVey, B. D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Potential effects of maternal contribution on egg and larva population dynamics of striped bass: Integrated individual-based model and directed field sampling

We have used a bioenergetically-driven, individual-based model (IBM) of striped bass as a framework for synthesizing available information on population biology and quantifying, in a relative sense, factors that potentially affect year class success. The IBM has been configured to simulate environmental conditions experienced by several striped bass populations; i.e., in the Potomac River, MD; in Hudson River, NY; in the Santee-Cooper River System, SC, and; in the San Joaquin-Sacramento River S… more

Date: January 1, 1991

Creator: Cowan, J.H., Jr. (Maryland Univ., Solomons, MD (United States). Chesapeake Biological Lab.) & Rose, K.A. (Oak Ridge National Lab., TN (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Simulating the operation of a port contender with SIM 4: applying Monte Carlo techniques to the Gandalf PACX IV

A simulation program, SIM 4, has been written which utilizes usage statistics to project PACK IV performance. Using this program, system managers can allocate scarce resources in an efficient manner.

Date: March 1, 1982

Creator: Totendino, L.F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Simulation of hanging file experiments with CALOR89

This note presents the comparison of CALOR89 simulation with the hanging file'' test measurements conducted at Fermilab during the period of Sep 91--Jan 92. The purpose of this study is to benchmark CALOR89 code against the experimental data to enhance its reliability and predictive power. Seven hanging file configurations were simulated. The measured values of e/{pi} ratio (the ratio of electron to pion signal at the same energy), hadronic and electromagnetic resolutions were compared with the… more

Date: January 1, 1992

Creator: Job, P.K.; Price, L.E.; Proudfoot, J. (Argonne National Lab., IL (United States). High Energy Physics Div.); Handler, T. (Tennessee Univ., Knoxville, TN (United States)) & Gabriel, T.A. (Oak Ridge National Lab., TN (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Continuing development of the DEROB system. Quarterly report, July 1, 1980-September 30, 1980

The last module of the DEROB System has been reprogrammed and recoded in an effort to reduce the computational time and cost associated with using DEROB. Some preliminary tests have been carried out on the new program, and the tentative results show that the time of execution can be reduced anywhere from 7% to 40% of the time required by the previous version of DEROB. The variability in the improvement arises from the options specified by the user. Additional tests are being carried out to debu… more

Date: October 1, 1980

Creator: Arumi-Noe, F

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Rapid seepage of contaminants through the highwall of a uranium mill tailings pit. [MIGRAT]

A computer code (MIGRAT) is used to quantify the migration of moisture and multiple retarded contaminants in the unsaturated zone and assess the impact of open mine disposal of uranium mill tailings. The model is applied to a generic uranium mill tailings. The model is applied to a generic uranium mill tailings pit constructed with a clay-lined bottom and steep unlined sidewalls. The migration of a two contaminant system is modeled assuming that neither contaminant decays and only one contamina… more

Date: January 1, 1984

Creator: Pin, F.G.; Witten, A.J.; Sharp, R.D. & Long, E.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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A one-and-a-quarter-dimensional transport code for field-reversed configuration studies: A user's guide for CFRX

A one-and-a-quarter-dimensional transport code, which includes radial as well as some two-dimensional effects for field-reversed configurations, is described. The set of transport equations is transformed to a set of new independent and dependent variables and is solved as a coupled initial-boundary value problem. The code simulation includes both the closed and open field regions. The axial effects incorporated include global axial force balance, axial losses in the open field region, and flux… more

Date: May 1, 1988

Creator: Hsiao, Ming-Yuan; Werley, K.A. & Ling, Kuok-Mee

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Molecular interactions in dilute supercritical mixtures: Molecular dynamics investigation

We performed a series of molecular dynamics simulations aimed at investigating the nature of the microstructure around solute molecules in a supercritical solvent, in the limit of infinite dilution (no solute-solute interactions). The choice of model system (pyrene in supercritical carbon dioxide) and state conditions (5--20 moles/liter; 37{degrees}C and 75{degrees}C) was done so as to match corresponding fluorescence experiments performed at Georgia Tech. 18 refs., 3 figs.

Date: January 1, 1991

Creator: Debenedetti, P.G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Structural analysis of the central Columbia Plateau utilizing radar, digital topography, and magnetic data bases

Interest in the Hanford site (Washington) as a nuclear production, power, and waste disposal site has led to generation of a vast quantity of geophysical and remote sensing data sets of the central Columbia Plateau. To data, these various studies, including at least 13 independent magnetic linear and image lineament studies, have not been adequately correlated. Therefore, these studies provide a unique opportunity to compare and contrast the viability of the different geophysical and remote sen… more

Date: August 1, 1991

Creator: Thiessen, R. L.; Eliason, J. R.; Johnson, L. K.; Brougher, C. W. (Washington State Univ., Pullman, WA (United States). Dept. of Geology); Foley, M. G. & Beaver, D. E. (Pacific Northwest Lab., Richland, WA (United States))

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proposed research on advanced accelerator concepts

This report summarizes technical progress and accomplishments during the proposed three-year research on advanced accelerator concepts supported by the Department of Energy under Contract No. DE-FG02-88ER40465. A vigorous theoretical program has been pursued in critical problem areas related to advanced accelerator concepts and the basic equilibrium, stability, and radiation properties of intense charged particle beams. Broadly speaking, our research has made significant contributions in the fo… more

Date: September 1, 1991

Creator: Davidson, R.C. & Wurtele, J.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Inelastic processes in seismic wave generation by underground explosions

Theories, computer calculations, and measurements of spherical stress waves from explosions are described and compared, with emphasis on the transition from inelastic to almost-elastic relations between stress and strain. Two aspects of nonspherical explosion geometry are considered: tectonic strain release and surface spall. Tectonic strain release affects the generation of surface waves; spall closure may also. The reduced-displacement potential is a common solution (the equivalent elastic so… more

Date: August 1, 1980

Creator: Rodean, H.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Fifth in situ vitrification engineering-scale test of simulated INEL buried waste sites

In September 1990, an engineering-scale in situ vitrification (ISV) test was conducted on sealed canisters containing a combined mixture of buried waste materials expected to be present at the Idaho National Engineering Laboratory (INEL) Subsurface Disposal Area (SDA). The test was part of a Pacific Northwest Laboratory (PNL) program to assist INEL in treatability studies of the potential application of ISV to mixed transuranic wastes at the INEL SDA. The purpose of this test was to determine t… more

Date: June 1, 1992

Creator: Bergsman, T.M.; Shade, J.W. (Pacific Northwest Lab., Richland, WA (United States)) & Farnsworth, R.K. (EG and G Idaho, Inc., Idaho Falls, ID (United States))

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Simulation of ethylbenzene dehydrogenation in microporous catalytic membrane reactors

Current state-of-the-art inorganic oxide membranes offer the potential of being modified to yield catalytic properties. The resulting modules may be configured to simultaneously induce catalytic reactions with product concentration and separation in a single processing step. Processes utilizing such catalytically active membrane reactors have the potential for dramatically increasing yield of reactions which are currently limited by either thermodynamic equilibria, product inhibition, or kineti… more

Date: April 1, 1989

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Modeling of Integrated Environmental Control Systems for Coal-Fired Power Plants Quarterly Report: January-March 1989

This is the sixth quarterly report of DOE Contract No. DE-AC22- 87PC79863, entitled Modeling of Integrated Environmental Control Systems for Coal-Fired Power Plants.'' This report summarizes accomplishments during the period January 1, 1989 to March 31, 1989. Efforts this past quarter focused primarily on the preparation of a computer User's Guide for the Integrated Environmental Control Model (IECM). Drafts of the first two chapters are now complete. These chapters constitute the bulk of this … more

Date: April 1, 1989

Creator: Rubin, E. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Some frontiers of accelerator physics

This paper discusses some concepts of future accelerators such as free electron lasers, two beam accelerator; and plasma-based adiabatic compressor. 12 refs., 10 figs., 5 tabs. (LSP)

Date: October 13, 1989

Creator: Sessler, A. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Natural convection phenomena in a nuclear power plant during a postulated TMLB' accident

After the TMI (Three Mile Island) accident, there has been significant interest in analyzing and understanding the phenomena that may occur in a PWR (Pressurized Water Reactor) accident which may lead to partial or total core meltdown and degradation. Natural convection is one of the important phenomena. In the present paper the results of two numerical simulations of (1) four-loop PWR and (2) three-loop PWR are presented. The simulations were performed with the COMMIX(2) computer code. Our ana… more

Date: January 1, 1987

Creator: Domanus, H. M.; Schmitt, R. C.; Sha, W. T.; Shah, V. L. & Han, J. T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Manual for COMSYN: A orbit integration code for the study of beam dynamics in compact synchrotrons

COMSYN is a numerical integration code which is written for the study and design of the compact synchrotrons. An improved 4th-order Runge-Kutta method is used in COMSYN to integrate the exact equations of motion in a rectangular coordinate system. The magnetic field components of the dipole B{sub x}, B{sub y} and B{sub z} can be obtained from either measurement or directly computed data (MAGNUS, TOSCA). A spline interpolation method is then used to get the field value at the particle position. … more

Date: October 1, 1991

Creator: Huang, Y.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Static and dynamic analyses on the MFTF-B vacuum vessel. Revision 1

The Mirror Fusion Test Facility is a major magnetic fusion energy project at the Lawrence Livermore National Laboratory. An important component of this facility is the vacuum vessel, which forms the vacuum chamber. The vessel is supported on twenty-two pairs of legs that rest on reinforced concrete piers. In performing static and dynamic analyses on the vacuum vessel, we separately investigated the load distribution under gravity loads, pressure loads, electromagnetic loads, and thermal loads. … more

Date: January 15, 1984

Creator: Ng, D.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Observation of tilt asymmetries in field-reversed configurations

In recent years, part of the experimental effort on the FRX-C/LSM device has been devoted to understanding why good FRC confinement is observed only in a narrow window of the operating parameter space (fill pressures less than 5 mtorr and bias fields less than 0.8--0.9 kG). The transition from good to bad confinement has been shown for some time to correlate with strong axial shocks, suggesting a formation or stability problem. More recently, FRC magnetic asymmetries have been observed whenever… more

Date: January 1, 1989

Creator: Tuszewski, M.; Barnes, D. C.; Klingner, P. & Ng, Chun

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Time-Dependent Two-Dimensional Radiation Hydrodynamics of Accreting Matter Onto Highly Magnetized Neutron Stars

We present for the first time, the self-consistent solution of the two-dimensional, time-dependent equations of radiation-hydrodynamics governing the accretion of matter onto the highly magnetized polar caps of luminous x-ray pulsars. The calculations show a structure in the accretion column very different from previous one-zone uniform models. We have included all the relevant magnetic field corrections to both the hydrodynamics and the radiative transport. We include a new theory for the diff… more

Date: November 24, 1989

Creator: Klein, R.I. (California Univ., Los Angeles, CA (USA). Dept. of Astronomy Lawrence Livermore National Lab., CA (USA) California Univ., Los Angeles, CA (USA). Inst. of Geophysics and Planetary Physics) & Arons, J. (California Univ., Berkeley, CA (USA). Dept. of Astronomy California Univ., Los Angeles, CA (USA). Inst. of Geophysics and Planetary Physics CEA Centre d'Etudes Nucleaires de Saclay, 91 -

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Influences of clouds and rain on the large-scale transport and deposition of sulfur

This paper describes the application of a three-dimensional, global-scale Eulerian model with an explicit description of cloud and chemical processes. Simulation results describing the transport of sulfur from North America and Europe across the north Atlantic Ocean during a climatological July are presented. Wet deposition was found to contribute slightly more to total sulfur deposition than dry deposition, a feature explained by the large amounts of precipitation during this month. The wet de… more

Date: July 1, 1991

Creator: Luecken, D.J.; Berkowitz, C.M. & Easter, R.C.

Item Type: Article

Partner: UNT Libraries Government Documents Department