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3-D computer simulations of EM fields in the APS vacuum chamber: Part 1, Frequency-domain analysis

Description: The vacuum chamber proposed for the storage ring of the 7-GeV Advanced Photon Source (APS) basically consists of two parts: the beam chamber and the antechamber, connected to each other by a narrow gap. A sector of 1-meter-long chamber with dosed end plates, to which are attached the 1-inch-diameter beampipes centered at the beam chamber, has been built for experimental purposes. The 3-D code MAFIA has been used to simulate the frequency-domain behaviors of EM fields in this setup. The results … more
Date: September 4, 1990
Creator: Chou, W. & Bridges, J.
Item Type: Refine your search to only Report
open access

APTBLIBE: Geometrical and Monte Carlo Sampling Routines for the Cray Computer

Description: APTBLIBE is a new BUILD library of about 151 Cray-compiled binary subroutines for numerical geometry and Monte Carlo sampling, of which 93 are described here (the rest will be described in a revision). It is designed especially to support 2-D and 3-D codes that generate and track beams or particles of energy or matter (APT = All-Particle-Tracking). The LIB library APTSLIBE contains the FORTRAN source files, and the user document APTDOC, much of which can be updated directly from the source file… more
Date: April 4, 1990
Creator: Edwards, Arthur L.
Item Type: Refine your search to only Report
open access

Chemical kinetic modeling of chlorinated hydrocarbons under stirred-reactor conditions

Description: The combustin of chloroethane is modeled as a stirred reactor so that we can study critical emission characteristics of the reactor as a function of residence time. We examine important operating conditions such as pressure, temperature, and equivalence ratio and their influence on destructive efficiency of chloroethane and production of other chlorinated products. The model uses a detailed chemical kinetic mechanism that we have developed previously for C{sub 3} hydrocarbons. We have added to … more
Date: October 4, 1990
Creator: Pitz, W.J. & Westbrook, C.K.
Item Type: Refine your search to only Article
open access

A comparative study of short range order in Fe-Cr and Fe-V alloys around equiatomic composition

Description: Configurational energies have been calculated for equiatomic Fe-Cr and Fe-V alloys possessing the high temperature bcc crystalline structure, within a first principles electronic band structure approach. In agreement with experimental facts, a tendency towards order, with a B2 ordered structure of CsCl type, is found for FeV whereas phase separation characterized FeCr. These results suggest that the nature of short range order in the high temperature bcc solid solution is not the primary drivin… more
Date: December 4, 1990
Creator: Turchi, P.E.A.; Sluiter, M. (Lawrence Livermore National Lab., CA (USA)) & Stocks, G.M. (Oak Ridge National Lab., TN (USA))
Item Type: Refine your search to only Article
open access

Detector distance selection for ICF temperature measurements by neutron TOF techniques

Description: Fuel ion temperatures for laser-driven, inertial-confinement fusion targets are often determined by neutron time-of-flight (TOF) techniques. The error in the temperature measurement is a minimum at a target-to-detector distance that depends on both target and detector characteristics. The error is dominated by the detector response at shorter distances and by the number of detected neutrons at larger distances. We develop equations that relate the temperature error to the target ion temperature… more
Date: September 4, 1990
Creator: Lerche, R. A. & Remington, B. A.
Item Type: Refine your search to only Article
open access

Dielectronic recombination measurements at EBIT (Electron Beam Ion Trap)

Description: The Electron Beam Ion Trap at the Lawrence Livermore National Laboratory has proved an ideal device for the study of interactions between electrons and highly-charged ions. I describe measurements of one such interaction, dielectronic recombination, in several ion species. The results are in marginal agreement with theoretical predictions. 8 refs., 6 figs.
Date: October 4, 1990
Creator: Knapp, D.A.
Item Type: Refine your search to only Article
open access

Emission assessment from full-scale co-combustion tests of binder- enhanced dRDF pellets and high sulfur coal at Argonne National Laboratory

Description: Argonne National Laboratory (ANL) and University of North Texas (UNT) research teams collected over 800 emissions and ash samples during the combustion of over 650 tons of binder enhanced densified refuse-drived fuel (b-dRDF) pellets with high sulfur coal in a spreader-stoker boiler at ANL. This full-scale test burn was conducted to validate predictions from laboratory and pilot scale test results that indicated substantial reductions of SO{sub 2}, NO{sub x} and CO{sub 2} in the flue gas, and t… more
Date: June 4, 1990
Creator: Ohlsson, O. O.; Livengood, C. D. (Argonne National Lab., IL (USA)) & Daugherty, K. E. (University of North Texas, Denton, TX (USA))
Item Type: Refine your search to only Article
open access

Enable Kit (MC-4246) for the DOT Charged Line System: Welding development report for 1/4-inch tubes and fittings

Description: The Enable Kit (MC-4246) is a high-pressure assembly that has several welds on 1/4-inch tubes and fittings. A series of sample welds that were well outside the expected process variability were made. These were then tested to determine the sensitivity of the welding process to variations in heat input. Test results showed satisfactory welds with no microstructural defects and a sufficient high-pressure safety factor after welding. From the information obtained, we are able to certify that produ… more
Date: June 4, 1990
Creator: Kautz, D. D. & Decofano, R. P.
Item Type: Refine your search to only Report
open access

Energetic particle production, cavition formation, and nonlinear development at a plasma density maximum

Description: We have investigated several phenomena of importance to laser-plasma interactions. In our studies, these are modeled by microwave and rf-plasma interactions. Our focus has been on resonant absorption of intense electromagnetic radiation at the plasma critical layer. Electron plasma wave (EPW) growth and caviton formation have been shown to be most efficient for shallow density gradients at the critical layer, where EPW convection losses are minimized. EPW electric field energies of 5000 times t… more
Date: September 4, 1990
Creator: Wong, A.Y. & Bauer, B.S. (California Univ., Los Angeles, CA (USA). Dept. of Physics)
Item Type: Refine your search to only Report
open access

Fermilab Library Directions

Description: In this document, we indicate our current thinking about the directions of the Fermilab Library. The ideas relate to the preprint management issue in a number of ways. The ideas are subject to revision as we come to understand what is possible as well as what is needed by the Laboratory community. This document should therefore be regarded as our personal view--the availability of off-the-shelf technology, of funding as well as feedback from the laboratory community about their needs will all a… more
Date: May 4, 1990
Creator: Garrett, P. & Ritchie, D.
Item Type: Refine your search to only Article
open access

Grazing incidence metal mirrors as the final elements in a laser driver for inertial confinement fusion

Description: Grazing incidence metal mirrors (GIMMS) have been examined to replace dielectric mirrors for the final elements in a laser beam line for an inertial confinement fusion (ICF) reactor. For a laser driver using light with a wavelength from 250 to 500 nm in a 10 ns pulse, irradiated mirrors made of Al, Al alloys, or Mg were found to have calculated laser damage limits of 0.3--2.3 J/cm{sup 2} of beam energy and neutron lifetime fluence limits of over 5 {times} 10{sup 20} neutrons per square centimet… more
Date: October 4, 1990
Creator: Bieri, R. L. & Guinan, M. W.
Item Type: Refine your search to only Article
open access

HYLIFE-2 inertial confinement fusion reactor design

Description: The HYLIFE-II inertial fusion power plant design study uses a liquid fall, in the form of jets to protect the first structural wall from neutron damage, x-rays, and blast to provide a 30-y lifetime. HYLIFE-I used liquid lithium. HYLIFE-II avoids the fire hazard of lithium by using a molten salt composed of fluorine, lithium, and beryllium (Li{sub 2}BeF{sub 4}) called Flibe. Access for heavy-ion beams is provided. Calculations for assumed heavy-ion beam performance show a nominal gain of 70 at 5… more
Date: October 4, 1990
Creator: Moir, Ralph W.
Item Type: Refine your search to only Article
open access

Ion temperature analysis of implosions of DT-filled capsules

Description: Fuel ion temperatures have been deduced for a series of implosions of DT-filled capsules by measuring the thermally broadened neutron time-of-flight signals at 10 m and at 20 m from the target. Typical temperatures were around 1 keV, and the corresponding thermal broadening was comparable to or less than the time response of the detectors. Under these conditions, error minimization is crucial, and we find that the location of the detector and the analysis technique are important. An optimum loc… more
Date: September 4, 1990
Creator: Remington, B. A.; Lerche, R. A. & Cable, M. D.
Item Type: Refine your search to only Article
open access

Laser driven instabilities in inertial confinement fusion

Description: Parametric instabilities excited by an intense electromagnetic wave in a plasma is a fundamental topic relevant to many applications. These applications include laser fusion, heating of magnetically-confined plasmas, ionospheric modification, and even particle acceleration for high energy physics. In laser fusion, these instabilities have proven to play an essential role in the choice of laser wavelength. Characterization and control of the instabilities is an ongoing priority in laser plasma e… more
Date: June 4, 1990
Creator: Kruer, W.L.
Item Type: Refine your search to only Article
open access

(Multiple coil pulsed magnetic resonance method to measure the SSC bending magnet multipole moments)

Description: The main emphasis has been to continue development of the high frequency (to 300 MHz) instrumentation, to test the system on a prototype bending magnet, construct the high frequency 32-channel electronics and probes, to seek industrial partners for technology transfer and commercial exploitation, and to do computer simulations for optimizing design parameters. Experience gained from tests made on a dipole magnet at Lawrence Berkeley Laboratory was extremely valuable and has resulted in substant… more
Date: September 4, 1990
Creator: Clark, W.G.
Item Type: Refine your search to only Report
open access

Novel plasma-based frequency upshift methods for short pulse lasers

Description: We discuss various novel methods of frequency upshifting short ({le} 1 picosecond) pulses of laser light. All of these methods make use of either the sudden creation of a plasma or relativistic plasma waves. The first method discussed is known as photon acceleration. This method makes use of the fact that a laser pulse moving in a plasma can be thought of as a packet of photons, each possessing an effective mass of m{sub {gamma}} = {h bar}{omega}{sub pe}/c{sup 2} and moving with the group veloc… more
Date: June 4, 1990
Creator: Wilks, S.C. (Lawrence Livermore National Lab., CA (USA)); Dawson, J.M. & Mori, W.B. (California Univ., Los Angeles, CA (USA). Dept. of Physics)
Item Type: Refine your search to only Article
open access

Oscillating liquid flow ICF (inertial confinement fusion) reactor

Description: Oscillating liquid flow in a falling molten salt inertial confinement fusion reactor is predicted to rapidly clear driver beam paths of residual molten salt. Oscillating flow will also provide adequate neutron and x-ray protection for the reactor structure with a short (2-m) fall distance permitting an 8 Hz repetition rate. A reactor chamber configuration is presented with specific features to clear the entire heavy-ion beam path of splashed molten salt. The structural components, including the… more
Date: October 4, 1990
Creator: Petzoldt, R.W.
Item Type: Refine your search to only Article
open access

Parametric cost analysis of a HYLIFE-II power plant

Description: The SAFIRE (Systems Analysis for ICF Reactor Economics) code was adapted to model a power plant using a HYLIFE-II reactor chamber. The code was then used to examine the dependence of the plant capital costs and busbar cost of electricity (COE) on a variety of design parameters (type of driver, chamber repetition rate, and net electric power). The results show the most attractive operating space for each set of driver/target assumptions and quantify the benefits of improvements in key design par… more
Date: October 4, 1990
Creator: Bieri, R.L. (Lawrence Livermore National Lab., CA (USA) Massachusetts Inst. of Tech., Cambridge, MA (USA))
Item Type: Refine your search to only Article
open access

(Production and environmental impacts of alternative motor fuels)

Description: The traveler participated in the 13th meeting of the Executive Committee on Alternative Motor Fuels (International Energy Agency). Participating countries in addition to the US are Canada, Italy, Finland, Japan, Sweden, and New Zealand (absent). The status of five existing annexes was reviewed and a pre-proposal for an additional annex to be a review of environmental impacts of fuels was presented by the traveler. This was well received by committee members, and a detailed proposal for such wor… more
Date: December 4, 1990
Creator: McGill, R.N.
Item Type: Refine your search to only Report
open access

Reduction of Beam Corkscrew Motion on the ETAII Linear Induction Accelerator

Description: The ETAII linear induction accelerator (6MeV, 3kA, 70ns) is designed to drive a microwave free electron laser (FEL) and demonstrate the front end accelerator technology for a shorter wavelength FEL. Performance to date has been limited by beam corkscrew motion that is driven by energy sweep and misalignment of the solenoidal focusing magnets. Modifications to the pulse power distribution system and magnetic alignment are expected to reduce the radius of corkscrew motion from its present value o… more
Date: September 4, 1990
Creator: Turner, W. C.; Allen, S. L.; Brand, H. R.; Caporaso, G. J.; Chambers, F. W.; Chen, Y. J. et al.
Item Type: Refine your search to only Article
open access

Report of Foreign Travel of J. E. Turner, Group Leader, September 1990

Description: The traveler attended the Fourth International Workshop on QSAR (Quantitative Structure-Activity Relationships) in Environmental Toxicology. He was an author or co-author on one platform and two poster presentations. The subject of the workshop offers a framework for analyzing and predicting the fate of chemical pollutants in organisms and the environment. QSAR is highly relevant to the ORNL program on the physicochemical characterization of chemical pollutants for health protection.
Date: October 4, 1990
Creator: Turner, J. E.
Item Type: Refine your search to only Report
open access

Soft x-ray detection with diamond photoconductive detectors

Description: Photoconductive detectors fabricated from natural lla diamonds have been used to measure the x-ray power emitted from laser produced plasmas. The detector was operated without any absorbing filters to distort the x-ray power measurement. The 5.5 eV bandgap of the detector material practically eliminates its sensitivity to scattered laser radiation thus permitting filterless operation. The detector response time or carrier life time was 90 ps. Excellent agreement was achieved between a diamond P… more
Date: May 4, 1990
Creator: Kania, D. R.; Pan, L.; Kornblum, H.; Bell, P.; Landen, O. N. & Pianetta, P.
Item Type: Refine your search to only Article
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