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Bibliography of Reports Relating to Project Sherwood (Controlled Thermonuclear Reactions) Written at University of California Radiation Laboratory, Livermore and Berkeley-1953 Through 1957-Unclassified Section

Description: This bibliography is a compilation of titles to unclassified reports, journal articles, and conference papers. The individual papers are divided into sections according to the year in which they appeared. (M.H.R.)
Date: May 1, 1958
Creator: Frost, F.E. comp.
Partner: UNT Libraries Government Documents Department

Energy Transfer Between Modified Maxwell Distributions

Description: S>A convenient modified form of Maxwell distribution is chosen. The modified expressions for the energy transfer from the ions to the electrons in a plasma and the bremsstrahlung from the electrons are calculated. Using the expressions some possible steady-state conditions for the ion and electron gases are derived and compared with those for the usual Maxwell distributions. (anth)
Date: September 20, 1956
Creator: Greyber, H.D.
Partner: UNT Libraries Government Documents Department

Development of Diffusion-Type Bonding Techniques for Berylco-25 Alloy

Description: Bond tensile strengths in excess of 90,000 psi in joining precipitation- hardened beryllium -copper have been obtained by diffusion techniques. Ordinary brazing techniques for beryllium--copper have resulted in an average of 40,000- psi tensile strength in the bond. Bonds with tensile strengths averaging 108,400 psi have been developed using high-vacuum, diffusion-type bonding techniques. Hardnesses averaging 38 Rockwell C'' can be obtained by air-blast cooling of the beryllium-copper after solution heat treatment (followed by precipitation hardening). (R.J.S.)
Date: September 1, 1961
Creator: Baxter, G.R.; Hoffman, J.A.; Bertossa, R.C. & Cottrell, B.R.
Partner: UNT Libraries Government Documents Department

ELECTRON-POPULATION ANALYSIS AND THE DIPOLE MOMENT OF THE LiH$sup 1$$Sigma$$sup +$ EXCITED STATE

Description: Detailed consideration is given to some properties of the first excited electronic state. Following the analysis proposed by Mulliken, SCF LCAO-MO coefficients are used to obtain qualitative information about the electron distribution. Comparison is made with earlier work with respect to the description of the excited state in terms of the interacting configurations. In addition to the excited-state dipole moment, the effective electric moment between the ground and excited states is also calculated. From this, the oscillator strength for the first allowed transition is computed as a function of the internuclear distance. (auth)
Date: July 1, 1959
Creator: Karo, A.M.
Partner: UNT Libraries Government Documents Department

Emission Characteristics of Tantalum, Tungsten, Rhenium, and Iridium in Plasma Diodes

Description: Experimental determinations of the ionic and electronic emission characteristics of tantalum, tungsten, rhenium, and iridium cathodes in vapor thermionic converters are compared. It is shown that tantalum provides superior thermal ionization qualities at high pressure compared with tungsten, rhenium, and iridium. High electronic current densities may be obtained from cesium on rhenium and cesium on iridium at much lower cesium vapor pressures than for tantalum or tungsten. (auth)
Date: April 1, 1962
Creator: Gust, W. H.
Partner: UNT Libraries Government Documents Department

Equation of State of Classical Systems of Charged Particles

Description: Recent developments in the classical theory of fully ionized gases and strong electrolyte solutions are reviewed, and are used to discuss the equation of state at high temperatures and low densities. The pressure is calculated using the ring-integral approximation, and quantitative estimates of higher correction terms are given. The effect of short range repulsive forces is shown by comparing the results with two kinds of potential functions hard spheres of diameter a, and soft'' spheres for which the short range potential cancels the Coulomb potential at the origin, and decreases exponentially with distance. It is found that the use of either type of potential extends the range of validity of the ring-integral approximation to considerably higher densities and lower temperatures. Since there is little difference in the results for the hard spheres and the soft spheres in this range, the latter system is investigated more extensively since it is more, easily handled by analytical methods. The expressions derived for the free energy of a system of charged particles can also be used in ionization equilibrium calculations, and the effect of electrostatic interactions on the equilibrium concentrations of various kinds of ions is indicated. 60 references. (auth)
Date: August 21, 1962
Creator: Brush, S.G.; DeWitt, H.E. & Trulio, J.G.
Partner: UNT Libraries Government Documents Department

The Formation of Protons From Water by Electron Impact

Description: The relative cross section for the production of protons from water by electron bombardment was measured by a modulated crossed beam technique over an energy range from threshold to 500 ev. The appearance potential for protons was measured by comparison with the ionization potential of hydrogen and found to be 19.4 ev. This result is in agreement with earlier results. The overall curve is smooth with the exception of a slight shoulder at about 45 ev. This shoulder may indicate the presence of more than one process for the formation of protons. (auth)
Date: July 26, 1962
Creator: Baker, F. S. & Brink, G. O.
Partner: UNT Libraries Government Documents Department

GAMMA RAYS FROM THE INTERACTION OF 14-Mev NEUTRONS WITH BERYLLIUM

Description: The cross section for the Be/sup 9/(n,t')Li/sup 7*/ -- Li/sup 7/ + gamma (0.477 Mev) reaction was measured in the vicixity of 14 Mev by detecting the gamma rays at scattering angles from 30 to 150 degrees. A time-of-flight technique was used to distinguish the gamma rays from the high neutron background. The cross section drops from 20 mb at 13.6 Mev to 10 mb at 14.1 Mev and then rises to 30 mb at 14.7 Mev. (auth)
Date: June 1, 1959
Creator: Benveniste, J.; Mitchell, A. C.; Schrader, C. D. & Zenger, J. H.
Partner: UNT Libraries Government Documents Department

The Hard-Core Pinch. Part I

Description: It is well known that a pinch column with internal H/sub Z/ and external conducting shell can be made grossly stable, but that small-scale instabilities persist; especiaily in the tubular region of maximum current density. To investigate further these small-scale instabilities of the stabilized pinch,'' we are using 12-in.-i.d. linear pinch tube with a 3-in.-o.d. insulated center rod. By controlling a current along this rod, as well as a current along external conducting straps, and a third current in an external H/sub z/ coil, it is possible to create many grossly stable pinch configurations. The small-scale stability of the tubular region of maximum current density can thus be studied for a wide range of internal and external magnetic field vectors. The magnetic field distribution in each discharge is obtained by a string of 10 magnetic pick- up loops. The distribution of plasma density is determined by modulating the inner or outer wall current and measuring the radial velocity of the resultant compressional Alfven waves. In one experiment, an initial H/sub z/ is entrapped in plasma by preionization, and then pushed radially outward from the rod by a rising H/sub theta /. The resultant field distribution, in which H/sub theta / everywhere falls more rapidly than 1/r, should have absolute hydromagnetic stability. The persistence of small-scale instabilities, as observed by the magnetic probes, in this inverse stabilized pinch'' suggests that the basic trouble is nonhydromagnetic. It is also found that, when the magnetic field approximates a vacuum field distribution, perfectly smooth and reproducible probe signals can be obtained. The absolute plasma current densities at which nearvacuum field distributions have been found stable are larger than current densities at which the 'stabilized pinch'' and inverse stabilized pinch'' distributions have been found unstable. (auth)
Date: July 31, 1959
Creator: Birdsall, D.H.; Colgate, S.A. & Furth, H.P.
Partner: UNT Libraries Government Documents Department

Heat-Shielded Magnetically Channeled Plasma Heat Converter

Description: A design for a thermionic converter is described which utilizes a permeable heat shield and a homogeneous magnetic field normal to the cathode and anode surfaces to minimize the radiant power loss without appreciably decreasing the electrical power output. The permeable heat shield consists of thin, close- spaced foils perpendicular to the cathode and anode surfaces. Radiant power transfer is expressed as a function of the spectral emissivities of the cathode and anode surfaces and the interfoil and interelectrode spacings. The heat shield is biased positive with respect to the cathode and anode surfaces to prevent positive ion loss, and, in conjunction with the normal homogeneous magnetic field, channels the electrons and ions to the anode. The required heat- shield positive bias is deduced and given as a function of the parameters of the converter. The energy conversion efficiencies attainable with this converter appear to be close to the Carnot efficiency. (auth)
Date: August 1, 1961
Creator: Fox, R.
Partner: UNT Libraries Government Documents Department

TORY II-A--A NUCLEAR RAMJET TEST REACTOR

Description: The design of Tory II-A is essentially complete and construction of the reactor and of its test facility is in progress. Test operation of the reactor is scheduled at a total power of 160 megawatts, with 800 pounds of air per second passing through the core and emerging at 2000 deg F. The core, 3 ft in dia and 41/ 2 ft long, will be composed of bundled ceramic tubes whose central holes will provide continuous air passages from end to end of a homogeneous mixture of UO/ sub 2/ fuel and BeO moderator, compacted and sintered to achieve high strength and density. Surrounding the core will be a thick graphite reflector containing moveable B-loaded nuclear control elements. The entire reactor, together with control actuators, a duct to bring coolant air up to and away from the core, and other auxiliaries, will be mounted on a railroad flatcar for convenient transportation between assembly-disassembly shops and the test point. A group of steel tanks will store 100,000 pounds of air, enough to cool the reactor at full power for at least a minute, with sufficient reserve for startup and shutdown phases. In addition, blowers will furnish a continuous supply of air at a much lower rate for lowpower operation and for protracted cooling after a fullpower run. Operatton of the reactor will be controlled from a building about 2 miles distant from the test point. In addition to information on Inlet air conditions and on neutron fiux level which will be necessary for reactor control, very extensive data on air and structure temperatures throughout the reactor, on air pressure distribution, and on strain and vibration in the reactor will be transmitted to the control building for display and recording. A heavily shielded disassembly building, fitted with remote-handling equipment, will provide for ...
Date: November 1, 1959
Creator: Hadley, J.W. ed.
Partner: UNT Libraries Government Documents Department

Underground Nuclear Detonations

Description: Since 1952 eight nuclear explosions have been fired underground at the Atomic Energy Commission's Nevada Test Site. The explosions have varied in energy release from 55 tons to 19,000 tons of TNT equivalent and were carried out at depths varying from shallow burial to produce cratering to those depths at which no visible effects appeared on the surface. The major experimental data from these explosions, as well as the phenomenology of the deeper shots, are summarized hero. (auth)
Date: July 1, 1959
Creator: Johnson, G.W.; Higgins, G.H. & Violet, C.E.
Partner: UNT Libraries Government Documents Department

Energy Transfer Between Charged Particles by Coulomb Collisions

Description: The theory of energy transfer between charged particles in a fully ionized gas is reviewed, and calculations are made of the rate at which energy is transferred from electrons at a temperature T to cooler ions. The interaction between ion and electron is assumed to be of the Debye form (Ze/r) exp (-r/ lambda ), where lambda is the Debye shielding length. It is suggested that future improvements of the theory of Coulomb interaclions in ionized gases are likely to be made in two ways: through employing an effective potential derived on the basis of quantum statistics for the electrons and through improvements in the two-body approximation to the many-body problem. (auth)
Date: May 12, 1958
Creator: Kidder, R. E.
Partner: UNT Libraries Government Documents Department

The Slowing-Down Distribution of Energetic Nuclei in a Fully Ionized Gas

Description: The steady-state energy distribution is obtained for a group of initially monoenergetic charged particles slowing down in a filly ionized gas. The distribution function is obtained analytically by solving the FokkerPlanck equation in energy space. With reference to thermonuclear reactions, the results obtained suggest that in some situations the contribution of the slowingdown distribution to the reaction rate may be significant. (auth)
Date: May 1, 1958
Creator: Kidder, R. E.
Partner: UNT Libraries Government Documents Department

On the Operator Approach to the Problem of Stability of Difference Schemes and the Convergence of Certain Iteration Procedures

Description: A number of considerations related to the stability of certain difference analogs of the differential equation of heat conduction and with the convergence of iteration procedures derived from implicit difference equations are presented. The operator approach is used in a manner which dispenses with the knowledge of eigenvalues. (J.R.D.)
Date: March 1, 1957
Creator: Lowan, A. N.
Partner: UNT Libraries Government Documents Department

Stability of the Interface Between Two Immiscible Liquids of Unequal Viscosity in a Porous Solid

Description: The stability of the interface between two immiscible fluids moving at a uniform rate through a porous medium is investigated. The conditions for stability are derived, and the rate of growing of instabilities of specified wavelength is obtained. The expression for the rate of growth of instability is similar in form to that obtained by Taylor for the case of uniformly accelerated incompressible liquids, but the growth rate is fouud to be inversely proportional to the wavelength rather than inversely proportional to the square root of the wavelength. (auth)
Date: May 1, 1958
Creator: Kidder, R. E.
Partner: UNT Libraries Government Documents Department

Tables of Two U$sup 235$ Fission Spectra

Description: The U/sup 235/ fission spectrum is tabulated as a function of energy for two analytic representations. The table contains the distribution functions, their first derivatives, and their first integrals up to 10 Mev. (auth)
Date: October 1, 1957
Creator: Howerton, R. J.; Bengston, J. & French, S. J.
Partner: UNT Libraries Government Documents Department

Application of a Modified Debye-Huckel Theory to Fully Ionized Gases

Description: The equations of the Debye-Huckel theory, modified to include quantum statistics, are discussed. It is found that the nonlinear equations used by Cowan and Kirkwcod are not unique and that the nonlinear theory can be formulated in different ways to give different answers. The linearized equations of these alternative formulations are discussed, and the correct form of the linearized theory is established. From the linear theory, the Helmholtz free energy of a slightly degenerate plasma is derived, and from this result, useful formulas in the near-classical limit are obtained for the pressure and internal energy. (auth)
Date: August 14, 1959
Creator: Kidder, R. E. & DeWitt, H. E.
Partner: UNT Libraries Government Documents Department