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Argonne Plasma Wake-Field Acceleration Experiments

Description: Four years after the initial proposal of the Plasma Wake-field Accelerator (PWFA), it continues to be the object of much investigation, due to the promise of the ultra-high accelerating gradients that can exist in relativistic plasma waves driven in the wake of charged particle beams. These wake-fields are of interest both in the laboratory, for acceleration and focusing of electrons and positrons in future linear colliders, and in nature as a possible cosmic ray acceleration mechanism. The pur… more
Date: March 14, 1989
Creator: Rosenzweig, J. B.; Cole, B.; Gai, W.; Konecny, R.; Norem, J.; Schoessow, P. et al.
Item Type: Refine your search to only Article
open access

Auxiliary plasma heating and fueling models for use in particle simulation codes

Description: Computational models of a radiofrequency (RF) heating system and neutral-beam injector are presented. These physics packages, when incorporated into a particle simulation code allow one to simulate the auxiliary heating and fueling of fusion plasmas. The RF-heating package is based upon a quasilinear diffusion equation which describes the slow evolution of the heated particle distribution. The neutral-beam injector package models the charge exchange and impact ionization processes which transfe… more
Date: March 14, 1989
Creator: Procassini, Richard J. & Cohen, Bbruce I.
Item Type: Refine your search to only Report
open access

Building 774A mini-melter restoration

Description: Large scale mechanical improvements were made on the 100th scale glass melter in building 774A following a shutdown in November, 1988. The circumstances regarding that shutdown were reported by P.M. Allen in DPST-89-345. By request, the Mechanical Development Group assumed responsibility for the work on SRL Service order DS-87042. This report describes the changes which were made, their purpose, and observations as to their effectiveness after approximately 4 weeks of operating with the improve… more
Date: April 14, 1989
Creator: Mensink, D. L.
Item Type: Refine your search to only Report
open access

Considerations of bunch-spacing options for multi-bunch operation of the Tevatron Collider

Description: This discussion will consider a number of points relevant to limitations, advantages and disadvantages of various arrangements of bunches in the Tevatron proton-antiproton collider. The considerations discussed here will be limited to: (a) bunch spacing symmetry and relation to the relative luminosity at B0 and D0 and the beam-beam interaction with separated beams; (b) bunch spacing constraints imposed by Main Ring RF coalescing and the optics of beam separation at B0 and D0; and (c) bunch spac… more
Date: December 14, 1989
Creator: Dugan, G.
Item Type: Refine your search to only Report
open access

Electrorefining cell evaluation

Description: Operational characteristics of the LANL electrorefining cell, a modified LANL electrorefining cell, and an advanced electrorefining cell (known as the CRAC cell) were determined. Average process yields achieved were: 75% for the LANL cell, 82% for the modified LANL cell, and 86% for the CRAC cell. All product metal from the LANL and modified LANL cells was within foundry specifications. Metal from one run in the CRAC cell exceeded foundry specifications for tantalum. The LANL and modified LANL … more
Date: April 14, 1989
Creator: Bronson, M. C. & Thomas, R. L.
Item Type: Refine your search to only Report
open access

Energy related studies utilizing microcline thermochronology

Description: Using Microcline Thermochronology (MTC), we have investigated the hydrothermal maturity of the Salton Sea Geothermal Field, potential or hydrocarbon maturation associated with heating due to ridge subduction beneath accretionary prism sediments, developed a single crystal dating system which has proven to greatly enhance interpretations regarding MTC, and also have begun to develop sound theoretical and experimental techniques which truly revolutionize our understanding of argon systematics in … more
Date: November 14, 1989
Creator: Harrison, T.M.
Item Type: Refine your search to only Report
open access

Enzymatic desulfurization of coal

Description: Our experimental approach focuses on the use of enzymes which catalyze the addition of oxygen to organic compounds., In tailoring the application of these enzymes to coal processing, we are particularly interested in ensuring that oxidation occurs at sulfur and not at carbon-carbon bonds. Previous studies with DBT have shown that the reaction most frequently observed in microbial oxidative pathways is one in which DBT is oxidized at ring carbons. These reactions, as we have said, are accompanie… more
Date: December 14, 1989
Creator: Boyer, Y.N.; Crooker, S.C.; Kitchell, J.P. & Nochur, S.V.
Item Type: Refine your search to only Report
open access

Enzymatic desulfurization of coal. Sixth quarterly report, September 16--December 15, 1989

Description: Our experimental approach focuses on the use of enzymes which catalyze the addition of oxygen to organic compounds., In tailoring the application of these enzymes to coal processing, we are particularly interested in ensuring that oxidation occurs at sulfur and not at carbon-carbon bonds. Previous studies with DBT have shown that the reaction most frequently observed in microbial oxidative pathways is one in which DBT is oxidized at ring carbons. These reactions, as we have said, are accompanie… more
Date: December 14, 1989
Creator: Boyer, Y. N.; Crooker, S. C.; Kitchell, J. P. & Nochur, S. V.
Item Type: Refine your search to only Report
open access

Gravimelt Process (Molten-Caustic-Leaching). Quarterly report, January--March 1989

Description: The objective of this project is to construct and operate an integrated test circuit for the Molten-Caustic-Leaching (Gravimelt) process for desulfurization and demineralization of coal to prove process economics assumptions, deliver product coal and to test process conditions aimed at significantly lowering costs. The test circuit consists of six unit operations which together provide a continuous system for leaching coal and regenerating the reactant. These units are: (a) a kiln for reacting … more
Date: April 14, 1989
Item Type: Refine your search to only Report
open access

Magnetic switching

Description: Magnetic switching is a pulse compression technique that uses a saturable inductor (reactor) to pass pulses of energy between two capacitors. A high degree of pulse compression can be achieved in a network when several of these simple, magnetically switched circuits are connected in series. Individual inductors are designed to saturate in cascade as a pulse moves along the network. The technique is particularly useful when a single-pulse network must be very reliable or when a multi-pulse netwo… more
Date: April 14, 1989
Creator: Kirbie, H.C.
Item Type: Refine your search to only Article
open access

Performance of concrete barriers in radioactive waste disposal in the unsaturated zone

Description: Concrete barriers are an important component of many designs for disposal of radioactive waste in the unsaturated zone. In order to evaluate the effectiveness of the concrete barriers performance assessment models representing the material degradation rates and transport properties must be developed. Models for evaluation of fluid flow and mass transport through partially failed concrete barriers located in the unsaturated zone are presented. Implications of the use of impermeable barriers desi… more
Date: September 14, 1989
Creator: Walton, J.C. (Idaho National Engineering Lab., Idaho Falls, ID (USA)) & Otis, M.D. (Science Applications International Corp., Idaho Falls, ID (USA))
Item Type: Refine your search to only Article
open access

Personal computer based decision support system for routing nuclear spent fuel

Description: An approach has been formulated to route nuclear spent fuel over the US Interstate highway network. This approach involves the generation of alternative routes so that any potential adverse impacts will not only concentrate on regions along the shortest path between the nuclear power plant and repository. Extensive literature research on the shortest path finding algorithms has been carried out. Consequently, an extremely efficient shortest path algorithm has been implemented and significantly … more
Date: November 14, 1989
Creator: Chin, Shih-Miao; Joy, D. S.; Johnson, P. E. (Oak Ridge National Lab., TN (USA)); Bobic, S. M. & Miaou, Shaw-Pin (Tennessee Univ., Knoxville, TN (USA). Transportation Center)
Item Type: Refine your search to only Article
open access

Photodecomposition of energetic nitro compounds

Description: The photodecomposition of energetic nitrocompounds depends on the excitation energy, the light intensity which determines the mono-, bi- or multiphotonic character of the initial process and their gaseous, liquid or solid state. The initial processes of the photodecomposition of nitromethane and nitroalcanes are reviewed and their relevance to the initiation of energetic nitrocompounds detonation is discussed. The case of nitramines (dimethylnitramine and tutorial) is also briefly introduced.
Date: March 14, 1989
Creator: Mialocq, J.C.
Item Type: Refine your search to only Report
open access

Relativistic klystron wakefields

Description: Monopole, dipole and quadrupole wake potentials are calculated for two cavities in a standing-wave relativistic klystron, using two independent programs, TBCI and AMOS. Reflections from model terminations which may distort long-range wakes can be mitigated either by using a very long pipe or by using absorptive materials at the pipe boundaries. 7 refs., 10 figs.
Date: April 14, 1989
Creator: Yu, D.U.L. (Duly Consultants, Rancho Palos Verdes, CA (USA)); Craig, G.D. & DeFord, J.F. (Lawrence Livermore National Lab., CA (USA))
Item Type: Refine your search to only Article
open access

The shell model approach: Key to hadron structure

Description: A shell model approach leads to a simple constituent quark model for hadron structure in which mesons and baryons consist only of constituent quarks. Hadron masses are the sums of the constituent quark effective masses and a hyperfine interaction inversely proportional to the product of these same masses. Hadron masses and magnetic moments are related by the assumption that the same effective mass parameter appears in the additive mass term, the hyperfine interaction, and the quark magnetic mom… more
Date: August 14, 1989
Creator: Lipkin, H.J. (Weizmann Inst. of Science, Rehovoth (Israel). Dept. of Nuclear Physics)
Item Type: Refine your search to only Article
open access

Switched power workshop: Power supply working group

Description: The power supply working group was assigned the problem of pulse charging the 3-MeV gun. The gun is a radial line structure that has two charging configurations: a single ring charged to 500 kV or nine rings charged from 100 to 200 kV. In either configuration, the pulsed source must rapidly charge the structure's ring(s) before breakdown can begin. The issues encountered in charging the structure can be divided into two categories. First, the charging system must be well matched to the gun stru… more
Date: April 14, 1989
Creator: Haseroth, H.; Hopkins, D.; Ikezi, H.; Kirbie, H.C.; Lincke, E. & Wilson, M.
Item Type: Refine your search to only Article
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