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A flat-cathode thermionic injector for the PHERMEX Radiographic Facility

Description: The PHERMEX (Pulsed High-Energy Radiographic Machine Emitting X-rays) standing-wave linear accelerator is a high-current electron beam generator used for flash-radiography. An improved electron gun has been designed employing a flat-thermionic cathode to replace the existing Pierce-geometry gun. The flat cathode yields increased current with the same applied voltage and cathode area as the Pierce gun. The ISIS code simulations indicate a beam current of 1.5 kA at 600 kV. The new geometry also reduces the probability for high voltage breakdown in the A-K gap. A reentrant magnet captures the expanding electron beam and a bucking coil nulls cathode-tinge field. A third coil is used to optimize the extraction field profile and reduce the effect of nonlinear space charge on the beam emittance. Time-resolved measurements of beam current and voltage have been made. In addition, a streak camera was used to measure beam emittance and spatial profile. Comparisons of measurements with simulations are presented.
Date: January 1, 1993
Creator: Kauppila, T.; Builta, L.; Burns, M.; Gregory, W.; Honaberger, D.; Watson, S. (Los Alamos National Lab., NM (United States)) et al.
Partner: UNT Libraries Government Documents Department

Report on dipole-dipole resistivity and technology transfer at the Ahuachapan Geothermal field Ahuachapan, El Salvador

Description: The Ahuachapan Geothermal Field (AGF) is a 90 megawatt geothermal-sourced powerplant operated by the Comision Ejecutiva Hidroelectrica del Rio Lempa (CEL) of El Salvador. During the period November 1987 through May 1988 a deep resistivity survey and technology transfer was performed at the AGF at the request of Los Alamos National Laboratory (LANL) as part of a United States Agency for International Development (USAID) project. The resistivity surveying is ongoing at the time of this report under the supervision of CEL personnel. LANL and contract personnel were present at the site during performance of the initial surveying for the purpose of technology transfer. This report presents the results and interpretation of the two initial resistivity survey lines performed on site during and shortly after the technology transfer period.
Date: August 1, 1988
Creator: Fink, J.B. (Geophynque International, Tucson, AZ (United States))
Partner: UNT Libraries Government Documents Department

Special design problems and solutions for high powered continuous duty linacs

Description: Several high powered linac designs are being considered for various purposes including radioactive waste treatment, tritium production, and neutron factories for materials studies. Since the fractional beam losses must be in the 10[sup [minus]]5 to 10[sup [minus]]6 range and are clearly subject to operational variables, the design engineers are forced to develop concepts which combine maintainability under radioactivity conditions, high availability, and very high reliability while dealing with the operating parameters resulting from CW operation. Several design solutions to selected problems are presented.
Date: January 1, 1993
Creator: Liska, D.; Carlisle, L.; McCauley, G. (Los Alamos National Lab., NM (United States)); Ellis, S.; Ilg, T. & Smith, P. (Grumman Aerospace Corp., Bethpage, NY (United States))
Partner: UNT Libraries Government Documents Department

Results of investigation at the Ahuachapan Geothermal Field, El Salvador

Description: The Ahuachapan Geothermal Field (AGF) is a 95 megawatt geothemal-sourced power-plant operated by the Comision Ejecutiva Hidroelectrica del Rio Lempa (CEL) of El Salvador. During the past decade, as part of an effort to increase in situ thermal reserves in order to realize the full generation capacity of the AGF, extensive surface geophysical coverage has been obtained over the AGF and the prospective Chipilapa area to the east. The geophysical surveys were performed to determine physical property characteristics of the known reservoir and then to search for similar characteristics in the Chipilapa area. A secondary objective was to evaluate the surface recharge area in the highlands to the south of the AGF. The principal surface electrical geophysical methods used during this period were DC resistivity and magnetotellurics. Three available data sets have been reinterpreted using drillhole control to help form geophysical models of the area. The geophysical models are compared with the geologic interpretations.
Date: April 1, 1990
Creator: Fink, J.B. (HydroGeophysics, Tucson, AZ (United States))
Partner: UNT Libraries Government Documents Department

Static and simulated seismic testing of the TRG-7 through -16 shear wall structures

Description: Results from the static, simulated seismic base excitation, and experimental modal analysis tests performed on the TRG-7 through -16 structures are reported. These results were used to establish the scalability of static and dynamic response measured on small structural models to the dynamic response of conventional concrete structures. In addition, these tests provided information concerning cumulative damage effects that occur in concrete structures when they are subjected to different dynamic load sequences. In contrast to previous results obtained in the early part of this program, TRG-7 through -16 responded to simulated seismic excitations with theoretical stiffness values until peak nominal base shear stress levels of 150 psi were reached. A summary of all experimental data obtained during this program is provided. 23 refs., 47 figs., 22 tabs.
Date: September 1, 1991
Creator: Farrar, C.R. (Los Alamos National Lab., NM (United States)); Baker, W.E. (New Mexico Univ., Albuquerque, NM (United States)) & Dove, R.C. (Dove (R.C.), Del Norte, CO (United States))
Partner: UNT Libraries Government Documents Department

Explosive stimulation of a geothermal well: GEOFRAC

Description: This paper describes the first known explosive stimulation successfully conducted in a geothermal well. Two tests were performed in a 2690-meter-(8826-ft.) deep Union Oil well at the Geysers field in Northern California in December 1981. The heat-resistant process, called GEOFRAC, uses a new unique, explosive HITEX 2, which is a nondetonable solid at room temperature. Upon melting at a temperature of 177[degrees]C (350[degrees]F), the HITEX 2 liquid becomes an explosive that can be safely heated to temperatures greater than 260[degrees]C (500[degrees]F). These unique properties of the explosive were exploited in the GEOFRAC process through the cooperative efforts of Physics International Company (PI), Rocket Research Company (RRC), Union oil Company (UO), and the university of California Los Alamos National Laboratories (LANL).
Date: July 1, 1982
Creator: Mumma, D.M. (Physics International Co., San Leandro, CA (United States))
Partner: UNT Libraries Government Documents Department

Exporting licensing regulations affecting US geothermal firms

Description: This document presents a brief introduction and overview of the Department of Commerce's Export Administration Regulations which might affect potential US geothermal goods exporters. It is intended to make US geothermal firms officials aware of the existence of such regulations and to provide them with references, contacts and phone numbers where they can obtain specific and detailed information and assistance. It must be stressed however, that the ultimate responsibility for complying with the above mentioned regulations lies with the exporter who must consult the complete version of the regulations.
Date: August 1, 1988
Partner: UNT Libraries Government Documents Department

MACCS versus GENII: Code comparison

Description: The computer codes GENII and MACCS, utilized for computing radiation doses, are discussed. The codes are compared from input from the source term from LANL file HW101-SY.INP, run dated 2/19/91. The release of radionuclides was assumed to be from a point source at ground level with a 10 minute release duration.Doses were calculated at a distance of 660 meters with an exposure duration of 2 hours. It was found that the 2 codes differed in how wind direction was treated.
Date: September 30, 1991
Creator: Foster, J. & Chanin, D.I. (Technadyne Engineering Consultants, Inc., Albuquerque, NM (United States))
Partner: UNT Libraries Government Documents Department

Calorimetry measurements in less than 20 minutes

Description: Argonne National Laboratory has developed a new series of 10 watt Bulk Plutonium Assay Calorimeters (BPAC10). The calorimeter measures bulk samples of plutonium bearing material in containers up to 5in. in diameter and 7in. high. The average measurement time is 19.7 minutes compared to 2--9 hours for the same sample measured in a water bath calorimeter. Measurement precision in the range of 1--10 watts is 1% to 0.1% and it is 0.010 watt for sample power less than 1 watt. BPAC10 series calorimeters are in use in two plutonium facilities at the EG G Rocky Flats Plant and at the Los Alamos National Laboratory TA55 Plutonium Facility. The paper presents a description of the calorimeter, discusses operating experience at Los Alamos, and presents a comparison of data on typical samples measured with both types of calorimeters. 5 refs., 5 figs., 1 tab.
Date: January 1, 1991
Creator: Perry, R.B. (Argonne National Lab., IL (United States)) & Cremers, T. (Los Alamos National Lab., NM (United States))
Partner: UNT Libraries Government Documents Department

Angle resolved photoemission on K{sub 0.3}MoO{sub 3}, TiTe{sub 2} and Ti{sub 1+x}S{sub 2}

Description: The authors have performed high resolution angle resolved photoemission spectroscopy (HRARPES) on samples of K{sub 0.3}MoO{sub 3}, TiTe{sub 2} and Ti{sub 1+x}S{sub 2}, materials which are a quasi-one dimensional metal, a quasi-two dimensional metal, and a quasi two-dimensional metal (x > 0) or semi-conductor (x = 0), respectively. They are interested in looking at these samples using HRARPES as part of the general program to assess the use of photoemission to determine whether a particular system behaves like a Fermi liquid or not. For one dimensional metallic systems, angle integrated photoemission studies to date, e.g., reveal that, contrary to higher dimensional cases where a sharp Fermi cutoff is seen at the Fermi level, there is very little weight at the Fermi level. It seems that there is yet no agreement why this is so. They think that detailed information they get from HRARPES will help them answer this question. The system Ti{sub 1+x}S{sub 2} gives the possibility to control the filling of the Ti 3d conduction band by adjusting x. Interest in this system lies in measuring the spectra and the line shape of samples with different stoichiometry and correlating the spectroscopic data with the corresponding transport data.
Date: September 1, 1994
Creator: Gweon, G. H.; Allen, J. W.; Zhang, Y.; Claessen, R.; Ellis, W. P.; Shen, Z. X. et al.
Partner: UNT Libraries Government Documents Department

Prototype integration of the joint munitions assessment and planning model with the OSD threat methodology

Description: The purpose of this Memorandum is to propose a prototype procedure which the Office of Munitions might employ to exercise, in a supportive joint fashion, two of its High Level Conventional Munitions Models, namely, the OSD Threat Methodology and the Joint Munitions Assessment and Planning (JMAP) model. The joint application of JMAP and the OSD Threat Methodology provides a tool to optimize munitions stockpiles. The remainder of this Memorandum comprises five parts. The first is a description of the structure and use of the OSD Threat Methodology. The second is a description of JMAP and its use. The third discusses the concept of the joint application of JMAP and OSD Threat Methodology. The fourth displays sample output of the joint application. The fifth is a summary and epilogue. Finally, three appendices contain details of the formulation, data, and computer code.
Date: June 1, 1994
Creator: Lynn, R. Y. S. & Bolmarcich, J. J.
Partner: UNT Libraries Government Documents Department

BMDO: New Mexico Technology Transfer Demonstration Project. Interim final report

Description: The BMDO-New Mexico Technology Transfer Demonstration Project(BMDO-NM) was a collaborative effort among the national laboratories to identify and evaluate the commercial potential of selected SDI-funded technologies. The project was funded by BMDO (formerly known as the Strategic Defense Initiative Office or SDIO), the Technology Enterprise Division (NM-TED) of the NM Economic Development Division, and the three National Laboratories. The project was managed and supervised by SAGE Management Partners of Albuquerque, and project funding was administered through the University of New Mexico. The BMDO-NM Demonstration Project focused on the development of a process to assist technology developers in the evaluation of selected BMDO technology programs so that commercialization decisions can be made in an accelerated manner. The project brought together BMDO, the NM-TED, the University of New Mexico, and three New Mexico Federal laboratories -- Los Alamos (DOE), Phillips (DOD) and Sandia (DOE). Each national laboratory actively participated throughout the project through its technology transfer offices. New Mexico was selected as the site for the Demonstration Program because of its three national and federal research laboratories engaged in BMDO programs, and the existing relationship among state govemment, the labs, universities and local economic development and business assistance organizations. Subsequent Commercialization and Implementation phases for the selected technologies from LANL and SNL were completed by SAGE and the Project Team. Funding for those phases was provided by the individual labs as well as BMDO and NM-TED in kind services. NM-TED played a proactive role in this New Mexico partnership. Its mandate is to promote technology-based economic development, with a commitment to facilitate the use of technology by industry and business statewide. TED assumed the role of program manager and executing agent for BMDO in this demonstration project.
Date: November 1, 1993
Partner: UNT Libraries Government Documents Department

BMAP dipole magnetic field analysis and orbit tracking/Calculations of energy deposition in GaAs WHEBY detectors. Final report

Description: This report contains two separate papers. The first paper discusses BMAP which is a versatile program for field analysis and orbit tracking in dipole magnets. The program was created to aid the design of charged-particle magnetic spectrometers. BMAP is written in Pascal and runs on any IBM-PC computer or compatible. The second paper covers a study on energy deposition in GaAS WHLEBY detectors. The study was done for two purposes: (1) to set up a three-dimensional electron-photon transport problem using the ACCEPT computer code; and (2) to calculate energy deposition in GaAs detectors in the WHEBY for a given flux of electrons.
Date: May 1, 1994
Creator: Humphries, S. Jr.; Baltrusaitis, R. M.; Ekdahl, C.; Young, C. & Warn, C.
Partner: UNT Libraries Government Documents Department

A 200 kV fast rise time, low jitter, trigger system with magnetic pulse sharpener

Description: The DARHT Facility is being designed at Los Alamos National Laboratory to produce high resolution flash radiographs of hydrodynamic experiments. Two linear induction accelerators (LIA), each in the range of 16 to 20 MeV, will be used to produce intense bremsstrahlung X-ray pulses of short duration (60 ns flat top). Each LIA will produce a 3 kA, high brightness, electron beam using a 4 MeV injector and a series of 250 kV induction cells. Technology demonstration of key accelerator subsystems is under progress at the DARHT Integrated Test Stand (ITS). The eight inductions cells present in the ITS are driven by a Maxwell prototype Induction Cell Pulsed Power Supply (ICPPS) which provides 250 kV, 70ns pulses via four Blumleins. Each Blumlein drives two cells and is triggered using independently controlled trigger units. This turnkey DARHT Trigger System, consisting of four separate trigger units, provides 200 kV trigger pulses with low jitter and fast rise time to each of the four Blumlein coaxial spark gaps. Details of the trigger system design and results obtained during extensive testing at Maxwell are described.
Date: December 31, 1993
Creator: Jaitly, N. C.; Ramrus, A.; Coleman, M. D.; Earley, L. M.; Downing, J. N.; Reisch, H. H. et al.
Partner: UNT Libraries Government Documents Department

Calculation of proton and neutron emission spectra from proton reactions with {sup 90}Zr and {sup 208}Pb to 160 MeV with the GNASH code

Description: A number of modifications have been made to the reaction theory code GNASH in order the accuracy of calculations at incident particle energies up to 200 MeV. Direct reaction a level density models appropriate for higher energy calculations are now used in the code, and most importantly, improved preequilibrium models have been incorporated into the code system. The code has been used to calculate proton-induced reactions on {sup 90}Zr and {sup 208}Pb for the International Code and Model Intercomparison for Intermediate Energy Reactions organized by the NEA. Calculations were performed with GNASH at incident proton energies of 25, 45, 80, and 160 mev using both the exciton model and Feshbach-Kerman-Koonin theory for the preequilibrium component. The models and procedures used in the GNASH calculations with the exciton model are described here. The results are compared to experimental data and to results from the GNASH calculations with Feshbach-Kerman-Koonin preequilibrium theory.
Date: June 1, 1994
Creator: Young, P. G. & Chadwick, M. B.
Partner: UNT Libraries Government Documents Department

A calorimeter for neutron flux measurement. Final report

Description: A calorimeter for absolute neutron flux measurement has been built and tested. The calorimeter measures the heat produced in a 10{degrees}K thick LiPb target when neutrons are captured via the {sup 6}Li(n,{sup 3}H){sup 4}He reaction. The sensitivity achieved was 1.3x10{sup 6} n/s for a 1 hour measurement. Separate flux measurements with the calorimeter and a {sup 238}U fission chamber are in agreement and show that systematic errors are less than 3%. An improved calorimeter has been built which is sensitive to 10{sup 5} n/s for a 1 hour measurement.
Date: April 1, 1993
Creator: Chupp, T. E.
Partner: UNT Libraries Government Documents Department

Cavitation and two-phase flow characteristics of SRPR (Savannah River Plant Reactor) pump. Final report

Description: The possible head degradation of the SRPR pumps may be attributable to two independent phenomena, one due to the inception of cavitation and the other due to the two-phase flow phenomena. The head degradation due to the appearance of cavitation on the pump blade is hardly likely in the conventional pressurized water reactor (PWR) since the coolant circulating line is highly pressurized so that the cavitation is difficult to occur even at LOCA (loss of coolant accident) conditions. On the other hand, the suction pressure of SRPR pump is order-of-magnitude smaller than that of PWR so that the cavitation phenomena, may prevail, should LOCA occur, depending on the extent of LOCA condition. In this study, therefore, both cavitation phenomena and two-phase flow phenomena were investigated for the SRPR pump by using various analytical tools and the numerical results are presented herein.
Date: July 1, 1991
Partner: UNT Libraries Government Documents Department

Chemical vapor deposition of metal nitrides, phosphides and arsenides. Final report

Description: The author recently reported that dialkylamido complexes are promising precursors to nitride thin films. On this basis it was reasoned that transition metal and main group disilazide complexes in which the silicon has dialkylamido substituents are potential precursors to ternary silicon nitride films. Bulky disilazide ligands are known to stabilize main group and transition metal complexes with low coordination numbers. Reaction of dimethylamine with Cl{sub 3}SiN(H)SiMe{sub 3} in hexane solution at 25{degrees}C gave the bulky disilazane [(Me{sub 2}N){sub 3}Si]N(h)SiMe{sub 3} (1) in 73% yield. Reaction of (1) with n-butyl lithium in benzene at 0{degrees}C produced [(Me{sub 2}N){sub 3}Si]N(Li)SiMe{sub 3} in 82% yield. LiN[Si(NMe{sub 2}){sub 3}]{sub 2} was chemically prepared in 92% yield and was converted to the amine with 83% yield. The author examined the use of amido precursors for main group oxide thin films. Sn(NMe{sub 2}){sub 4} and Si(NMe{sub 2}){sub 4} react with oxygen in an atmospheric pressure chemical vapor deposition reactor to give SnO{sub 2} and SiO{sub 2} films, respectively. The films were deposited on quartz, silicon, and glass at substrate temperatures of 250--400 {degrees}C. The results of the characterizations of the films and compounds are presented in this report.
Date: March 1, 1994
Creator: Hoffman, D. M.
Partner: UNT Libraries Government Documents Department

[Studies on the interaction of blood components with ultra-smooth polymer surfaces]

Description: This report is in three parts, though each is briefly described data is provided. The three parts address (1) radioiodination of human thrombin and fibrinogen; (2) interaction of blood components with ultra- smooth polymer surfaces; and (3) initial studies of Tecoflex and treated Tecoflex cups with normal serum samples.
Date: April 17, 1989
Creator: Carlson, T. H.
Partner: UNT Libraries Government Documents Department

Silicon-germanium/gallium phosphide material in high power density thermoelectric modules. Final report, February 1980--September 1981

Description: This is the final report of work on the characterization of an improved Si-Ge alloy and the fabrication of thermoelectric devices. The improved Si-Ge alloy uses a small addition of GaP in n- and p- type 80 at.% Si-20 at.% Ge; this addition reduces the thermal conductivity, thereby increasing its figure of merit and conversion efficiency. The thermoelectric devices fabricated include multicouples intended for use in Radioisotope Thermoelectric Generators (RTGs) and ring-type modules intended for use with nuclear reactor heat sources. This report summarizes the effort in the material as well as the device areas and discusses individual phases of each area. Results should form basis for further effort.
Date: December 31, 1981
Partner: UNT Libraries Government Documents Department

Simulating silicic eruptions at Long Valley, California as a method to understand processes that influence eruption phenomena associated with caldera formation. IGPP progress report, October 1, 1993--August 31, 1994

Description: There are two primary objectives of this project. The first objective consists of developing a complete data set of physical parameters from Long Valley caldera and the Bishop Tuff to constrain the initial and boundary conditions for numerical simulations. The second objective will be the completion of a series of numerical simulations that will provide explicit and testable models constraining the evolution of the caldera eruption that formed the Long Valley caldera and associated pyroclastic deposits (Bishop Tuff). Achieving the proposed objectives will require two steps. First, a comprehensive analysis of the intracaldera Bishop Tuff will be performed using high precision micro-beam analytical techniques on melt inclusions found in quartz phenocrysts. Second, data obtained from the analysis of the intracaldera Bishop Tuff together with data obtained from other studies will be used to constrain the initial and boundary conditions of the numerical simulations. Preliminary simulations based on initial and boundary conditions defined by the caldera structure and volatile concentrations found in the intracaldera Bishop Tuff indicate that erupted pyroclastic material would not have the required momentum to escape the caldera depression.
Date: December 31, 1994
Creator: Papike, J. J.; Servilla, M. S. & Wohletz, K. H.
Partner: UNT Libraries Government Documents Department

Research activities of Martin C. Casdagli at SFI September 1989--May 1991

Description: My research over this period has focused on the theory and application of non-linear time series forecasting. The purpose of time series forecasting is to predict apparently random behavior about which we have little or no knowledge. A time series is a set of values that change in time, for example, daily stock market prices for a given set of firms, or the volume of the polar ice caps over the last two million years. Recent developments in the understanding of chaotic dynamical systems have stimulated new approaches to time series analysis. These results raise the possibility that apparently random behavior may essentially be the consequence of chaotic behavior of deterministic equations with a small number of variables. My main research effort has been to develop a theory of nonlinear time series forecasting which applies to chaotic time series with low levels of observational noise. I have also developed a new algorithm for analyzing experimental time series data in order to determine whether a nonlinear deterministic, as opposed to nonlinear stochastic model is an appropriate description of the data, and have applied this algorithm to a wide range of time series data. In addition to involvement in these and other research activities, I have helped organize a conference on nonlinear modeling and forecasting, jointly sponsored by NATO and SFI. I describe the above projects in more detail in the following paragraphs. Several of these projects benefited greatly fro the excellent computer facilities available at SFI.
Date: December 31, 1993
Partner: UNT Libraries Government Documents Department

Evaluation of OPEN PLAN software: Final report

Description: In fulfilling the objectives of the contract to evaluate the suitability of the OPEN PLAN software system to process existing Environmental Restoration (ER) data, Jacobs Engineering Group (JEG) divided the effort into seven discrete tasks. Overall results of the tasks performed demonstrated that OPEN PLAN could be used in conjunction with the currently used TIMELINE to provide resource leveling and meet all reporting requirements. The OPEN PLAN report generator could automatically produce reports which were equivalent to existing ER cost reports being produced manually or by spreadsheet. User documentation was provided and on-site training was performed. The result of the cost and schedule tracking support was the creation of new spreadsheet based reports using TIMELINE and LOTUS 1-2-3. Some additional modifications may need to be made to incorporate installation specific needs as well as any changes in reporting requirements.
Date: March 5, 1991
Partner: UNT Libraries Government Documents Department