1,395 Matching Results

Search Results

Advanced search parameters have been applied.

in subjects: "Deuterium"

open access

Single particle behavior in plasmas

The paper follows the history of a neutral atom or molecule into a plasma--ionization, dissociation, radiation,--until it becomes a set of charged particles moving in the electromagnetic fields of the plasma system. The various useful forms of the method of averaging are displayed and applied to calculation of constants of motion. The breakdown of these constants is discussed along with some of the implications for fusion systems.

Date: March 10, 1977

Creator: McNamara, B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

TCT hybrid preconceptual blanket design studies

The conceptual design of a tokamak fusion-fission (hybrid) reactor, which produces electric power and fissile material, has been performed in a cooperative effort between Princeton's Plasma Physics Laboratory (PPPL) and Battelle's Pacific Northwest Laboratories (PNL). PPPL, who had overall project lead responsibility, designed the fusion driver system. Its core consists of a tokamak plasma maintained in the two-component torus (TCT) mode by both D and T beams and having a single null poloidal d… more

Date: January 1, 1978

Creator: Aase, D. T.; Bampton, M. C. C.; Doherty, T. J.; Leonard, B. R.; McCann, R. A.; Newman, D. F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

High beta studies on ISX-B with neutral beam injection

Injection of H/sup 0/ into D/sup +/ plasmas with beam power P/sub b/ of up to 1.7 MW has produced rms betas of approx. 4%, volume-averaged betas of approx. 3%, and central betas of approx. 10% in the ISX-B tokamak. Although theoretical calculations indicate that the observed equilibria may be unstable to ballooning modes, no catastrophic loss of confinement has been observed, and beta continues to increase with injection power. In these beam-dominated high-beta discharges the electron and ion e… more

Date: September 1980

Creator: Sheffield, J.; Bates, S.C. & Bush, C.E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radially resolved measurements of ''q'' on the ATC tokamak

This paper describes a new technique for directly measuring the safety factor, or q, profile in a tokamak. A tightly collimated neutral beam capable of injecting approximately 100 mA of 30 keV deuterium atoms was mounted on the ATC tokamak. By proper tangential aiming of the beam a strong concentration of circulating fast ions was created at a chosen plasma minor radius. By examining the orbits of these ions with a multi-sight-line charge exchange detector, it was possible to measure the shifts… more

Date: April 1, 1978

Creator: Goldston, R.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Some effects on the kinetics of muon-catalyzed fusion

Two important stages in the kinetics of muon-catalyzed d-t fusion are discussed: (1) atomic thermalization and hyperfine-state relaxation preceding molecular formation and (2) muon stripping and x-ray production if sticking occurs after nuclear fusion. Thermalization is accurately treated by Monte Carlo simulation. It is shown that thermalization and triplet quenching of the ..cap alpha mu.. atom may not finish before dt..mu.. formation in low-tritium targets, but that epithermal transients are… more

Date: January 1, 1986

Creator: Cohen, J.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Health physics aspects of nuclear radiations from deuterium beam injectors

Estimations are made for X-ray generation from the accelerator column of various neutral beam injectors. For the case of deuterium beam operation where 2.5-MeV D-D neutrons pose a serious health physics concern, neutron and tritium production rates from beam targets are calculated for different beam energies. Biological doses from these radiations and shielding requirements are discussed.

Date: February 1, 1978

Creator: Kim, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Kinetics of the radiation-induced exchange reactions of H/sub 2/, D/sub 2/, and T/sub 2/: a review

Mixtures of H/sub 2/--T/sub 2/ or D/sub 2/--T/sub 2/ will exchange to produce HT or DT due to catalysis by the tritium ..beta.. particle. The kinetics of the reaction D/sub 2/ + T/sub 2/ = 2DT may play an important role in designing liquid or solid targets of D/sub 2/--DT--T/sub 2/ for implosion fusion, and distillation schemes for tritium cleanup systems in fusion reactors. Accordingly, we have critically reviewed the literature for information on the kinetics and mechanism of radiation-induce… more

Date: January 6, 1978

Creator: Pyper, J.W. & Briggs, C.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear spin polarization of solid deuterium-tritium

It appears that parallel alignment of deuteron and triton magnetic moments increases the cross section of the nuclear reaction T(d,n) He/sup 4/ by 50%, thereby promising a laser driver of perhaps half the original energy. Both ''brute-force'' and dynamic nuclear polarization are considered, and the many potential problems of the latter are considered. High nuclear polarization by the dynamic technique requires a small nucleus-to-unpaired electron ratio, a long longitudinal nuclear relaxation ti… more

Date: January 1, 1985

Creator: Souers, P. C.; Fearon, E. M.; Mapoles, E. R.; Gaines, J. R.; Sater, J. D. & Fedders, P. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Low-background measurements of neutron emission from Ti metal in pressurized deuterium gas

A wide variety of neutron detector systems have been used at various research facilities to search for anomalous neutron emission from deuterated metals. Some of these detector systems are summarized here together with possible sources of spurious signals from electronic noise. During the past two years, we have performed experiments to measure neutron emission from pressurized D{sub 2} gas mixed with various forms of titanium metal chips and sponge. Details concerning the neutron detectors, ex… more

Date: January 1, 1991

Creator: Menlove, H. O.; Paciotti, M. A.; Claytor, T. N. & Tuggle, D. G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Quadrupole mass-filter sensitivities of H/sub 2/, HD, D/sub 2/, and T/sub 2/, and the kinetics of. beta. -particle induced exchange between H/sub 2/, D/sub 2/, and T/sub 2/ at 25. 4/sup 0/C

We have constructed a quadrupole-mass filter system to measure the equilibrium constants and rates of reaction of the ..beta..-particle-induced exchanges between H/sub 2/, D/sub 2/, and T/sub 2/ at cryogenic temperatures. Even with careful calibration experiments at 25.4/sup 0/C, we could not completely remove the mass discrimination inherent in our method. We estimate the accuracy of our mixture analyses to be +-2.2% in the D/sub 2/-DT-T/sub 2/ system, and +-9% in the H/sub 2/-HT-T/sub 2/ syst… more

Date: January 11, 1978

Creator: Pyper, J. W.; Kelly, E. M.; Magistad, J. G.; Tsugawa, R. T.; Roberts, P. E. & Souers, P. C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Phase Transformations in Alumina. Technical Report, May to December 1961

e transformation studies showed that synthetic aluminas produced in the laboratory were not transformed to alpha alumina at 400 to 700' deg n the presence of nitric acid and water vapor. Amorphous aluminn produced in the pilot plant was transformed to alpha alumina. This indicated that the amorphous alumina produced in the pilot plant is structurally predisposed to form alpha alumina. Most additives did not appear to have any special effects. Lithium formed zeta alumina, LiAl/sub 5/O/sub 8/. Ph… more

Date: December 1, 1961

Creator: Eding, H J; Huggins, M L & Brown, A G

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Feasibility of beam driven semi-catalyzed deuterium fusion neutron sources for hybrid reactor applications

The assessment is based on the estimation of the fusion device plasma properties using a simple point model, on general energy balance considerations for hybrid reactors for power generation, and on the estimation of expected performance of a specific type of hybrid reactor-a natural uranium fueled, light water moderated breeding hybrid power reactor driven by a semi-catalyzed deuterium fusion neutron source. Beam-driven semi-catalyzed deuterium and D-T fusion devices for hybrid power reactor a… more

Date: December 1, 1977

Creator: Greenspan, E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

SANS (small angle neutron scattering) measurement of deuterium-dislocation correlation in palladium

Small angle neutron scattering (SANS) measurements have been made on deformed polycrystal palladium samples with and without deuterium dissolved in the solution phase ({alpha}) at room temperature. Concentrations were held constant during SANS experiments by an equilibrium gas pressure cell. The difference scattering cross section for the same sample with and without deuterium loading has a 1/Q behavior (Q=4{pi}/{lambda} sin{theta}/2) at intermediate values of Q. At very low values of Q the dep… more

Date: November 1, 1989

Creator: Heuser, B.J.; Summerfield, G.C.; King, J.S. (Michigan Univ., Ann Arbor, MI (USA)) & Epperson, J.E. (Argonne National Lab., IL (USA))

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Plasma-Induced Conversion of Surface-Adsorbed Hydrocarbons

Experimental results are reported for an electrical device for direct conversion of methane into higher hydrocarbons. A microchannel plate is excited with electrons from a photoemissive source, and electron impact ionization of methane on the inner surfaces of the microchannels creates an ion feedback process. The resulting low-density plasma creates higher hydrocarbons when charged particles impact the surfaces at grazing incidence. The production Of C{sub 2} to C{sub 8}-containing gases was n… more

Date: January 1, 1992

Creator: Sackinger, W. M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiation Shielding Design Considerations for Doublet III

Calculations and measurements were made of the bremsstrahlung (x-ray) doses resulting from runaway electron shots at Doublet III. The analysis considered direct, wall-scattered, and skyshine contributions. Reasonably good agreement was obtained between calculations and measurements. The x-ray dose in the control room was about 1 mR per runaway shot, while that at the north boundary was undetectable, with a calculated value of 0.05 mR per shot. These low doses attest to the adequacy of the 2 ft … more

Date: June 1, 1980

Creator: Engholm, B. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Muon-catalyzed fusion theory: Introduction and review

Muon-catalyzed fusion ({mu}CF) has proved to be a fruitful subject for basic physics research as well as a source of cold nuclear fusion. Experiments have demonstrated that over 100 fusions per muon can be catalyzed by formation of the dt{mu} molecule in mixtures of deuterium and tritium. After a brief review of the subject's history, the dt{mu} catalysis cycle and the principal relations used in its analysis are described. Some of the important processes in the {mu}CF cycle are then discussed.… more

Date: January 1, 1989

Creator: Cohen, J.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Studies in Hot Atom and Radiation Chemistry Progress Report: September 1977

The reactive scattering of the reaction of the first excited state of C/sup +/ (/sup 4/P) with molecular hydrogen was studied over an energy range of 0.5 to 9.0 eV. The measurements indicate that the reaction proceeded by a direct mechanism and the final product was in the a/sup 3/pi state. The reaction of ground-state C/sup +/(/sup 2/P) with D/sub 2/ and H/sub 2/ was examined over the energy range of 2.5 eV to 28 eV. Over this energy range unambiguous identification of CD/sup +/ in the X/sup 1… more

Date: January 1, 1977

Creator: Koski, W. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Numerical solution of the Schroedinger integral equation for dt. mu. Progress report

The Schroedinger Integral Equation is derived for an N-body system, and solutions for required Green's functions are obtained. The initial method of numerical solution has yielded the correct ground states and lower excited states of He (test case) and dt..mu... Steps are being taken to improve the numerical accuracy.

Date: August 22, 1986

Creator: Morgan, D.L. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Impact of alternate fusion fuels on fusion reactor technology: an initial assessment study. [Catalyzed D, D-/sup 3/He, p-/sup 6/Li, p-/sup 7/Li, D-/sup 6/Li, p-/sup 11/B, /sup 3/He-/sup 3/He]

The initial results of a study carried out to assess some of the technology implications of non-D-T fusion fuel cycles are presented. The primary emphasis in this report is on D-D, catalyzed-D and D-/sup 3/He fuel cycles. Tokamaks and field-reversed mirrors have been selected as sample confinement concepts. A new technique of employing neutronic computer codes to study the transport of cyclotron radiation for cases of non-uniform density and temperature profiles is described. The technology are… more

Date: November 1, 1979

Creator: Baker, C. C.; Bolon, A. & Clemmer, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Operation of the repeating pneumatic injector on TFTR and design of an 8-shot deuterium pellet injector

The repeating pneumatic hydrogen pellet injector, which was developed at the Oak Ridge National Laboratory (ORNL), has been installed and operated on the Tokamak Fusion Test Reactor (TFTR). The injector combines high-speed extruder and pneumatic acceleration technologies to propel frozen hydrogen isotope pellets repetitively at high speeds. The pellets are transported to the plasma in an injection line that also serves to minimize the gas loading on the torus; the injection line incorporates a … more

Date: January 1, 1985

Creator: Combs, S. K.; Milora, S. L.; Foust, C. R.; Baylor, L. R.; Burris, R. D.; Fisher, P. W. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Interaction of the neutral deuterium flux with a field-reversed configuration

Recycling effects arising from the penetration of cold neutrals into a hot plasma has been known to contribute to confinement properties of tokamaks, mirrors, RFPs, and spheromaks. To data, however, ionization and charge exchange processes associated with the possible influx of neutrals have been neglected in FRC transport models, or their effects have been found negligible for experiments with short lifetimes (< 20 ..mu..s). These processes are also neglected when ascertaining the experimental… more

Date: January 1, 1984

Creator: Rej, D.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of an ion source for long-pulse (30-s) neutral beam injection

This paper describes the development of a long-pulse positive ion source that has been designed to provide high brightness deuterium beams (divergence approx. = 0.25/sup 0/ rms, current density approx. = 0.15 A cm/sup -2/) of 40 to 45 A, at a beam energy of 80 keV, for pulse lengths up to 30 s. The design and construction of the ion source components are described with particular emphasis placed on the long-pulse cathode assembly and ion accelerator.

Date: January 1, 1982

Creator: Menon, M. M.; Barber, G. C.; Blue, C. W.; Dagenhart, W. K.; Gardner, W. L.; Haselton, H. H. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Conceptual design study of spheromak reactors

Preliminary design studies are carried out for a spheromak fusion reactor. Simplified circuit theory is applied to obtain characteristic relations among various parameters of the spheromak configuration for an aspect ratio A greater than or equal to 1.6. These relations are used to calculate the parameters for the conceptual designs of three types of fusion reactor: (1) DT two-component, (2) DT ignited, and, (3) catalyzed DD ignited reactors. With a total wall loading of approx. 4 MWm/sup -2/, … more

Date: July 1, 1980

Creator: Katsurai, M. & Yamada, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Advanced-fueled fusion reactors suitable for direct energy conversion. Fourth quarterly progress report: October 1976--December 1976 and first quarterly progress report: January 1977--March 1977

The direct energy conversion efficiencies calculated for Cat-D and D-/sup 3/He fueled Tokamak reactors are summarized over a range of reactor designs, collector configurations, assumed T/sub e//T/sub i/ ratios, and power densities. The performance of a system of superconducting coils that produce those fields required to guide escaping plasma along the path between the bundle divertor coils and the direct converter is also discussed.

Date: September 9, 1977

Creator: Blum, A. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department