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open access

Acquisition and preparation of specimens of rock for large-scale testing

Description: The techniques used for acquisition and preparation of large specimens of rock for laboratory testing depend upon the location of the specimen, the type of rock and the equipment available at the sampling site. Examples are presented to illustrate sampling and preparation techniques used for two large cylindrical samples of granitic material, one pervasively fractured and one containing a single fracture.
Date: February 1, 1981
Creator: Watkins, D.J.
open access

AN APPLICATION OF FUZZY SET THEORY TO DATA DISPLAY

Description: Categorization supports decision making, letting an analyst look at data from different perspectives and different levels of detail. An approach to data analysis is described in which membership in subjectively defined categories is modeled by the fuzzy nature of color categories and presented via computer graphics for visual inspection by the analyst.
Date: February 1, 1981
Creator: Benson, William H.
open access

Assessment of effectiveness of geologic isolation systems: the AEGIS geologic simulation model

Description: Assessment of the post-closure performance of a nuclear waste repository has two basic components: the identification and analysis of potentially disruptive sequences and the pattern of geologic events and processes causing each sequence, and the identification and analysis of the environmental consequences of radionuclide transport and interactions subsequent to disruption of a repository. The AEGIS Scenario Analysis Task is charged with identifying and analyzing potenially disruptive sequence… more
Date: February 1, 1981
Creator: Foley, M. G. & Petrie, G. M.
open access

Beam energy measurements at the Bevalac

Description: In the Bevalac there are several problems that make it very difficult to determine a more precise value for magnetic field. The radial field shape enclosed within the B dot integrating loop on the poletips changes as a function of field strength. The effective magnetic quadrant length also changes as a function of field strength. This causes a major perturbation in the radial position of the equilibrium orbit as well as some uncertainty in the value of the magnetic field. In addition to the mag… more
Date: February 1, 1981
Creator: Crebbin, K. C.
open access

Chemical modeling of irreversible reactions in nuclear waste-water-rock systems

Description: Chemical models of aqueous geochemical systems are usually built on the concept of thermodynamic equilibrium. Though many elementary reactions in a geochemical system may be close to equilibrium, others may not be. Chemical models of aqueous fluids should take into account that many aqueous redox reactions are among the latter. The behavior of redox reactions may critically affect migration of certain radionuclides, especially the actinides. In addition, the progress of reaction in geochemical … more
Date: February 1, 1981
Creator: Wolery, T.J.
open access

Computer simulation of longitudinal single-bunch effects in electron-positron storage rings

Description: The computer code TRACK simulates longitudinal single-bunch effects in an electron-positron storage ring. The program tracks the turn-by-turn energy and phase deviations of N superparticles, where N is 100-1000. In addition to the usual RF and lattice parameters, an input to the program is the wake potential function for the ring vacuum chamber. The program has been applied to compute bunch lengthening in SPEAR as a function of charge per bunch. Although the computed results are in qualitative … more
Date: February 1, 1981
Creator: Wilson, P.B.; Bane, K.L.F. & Satoh, K.
open access

Conceptual design strategy for liquid-metal-wall inertial-fusion reactors

Description: The liquid-metal-wall chamber has emerged as an attractive reactor concept for inertial fusion energy conversion. The principal feature of this concept is a thick, free-flowing blanket of liquid metal used to protect the structure of the reactor. The development and design of liquid-metal-wall chambers over the past decade provides a basis for formulating a conceptual design strategy for such chambers. Both the attractive and unattractive features of a LMW chamber are enumerated, and a design s… more
Date: February 1, 1981
Creator: Monsler, M. J. & Meier, W. R.
open access

Damage analysis and fundamental studies

Description: As a planning activity, the objectives of the workshop were to list, prioritize and milestone the activities necessary to understand, interpret and control the mechanical behavior of candidate fusion reactor alloys. Emphasis was placed on flow and fracture processes which are unique to the fusion environment since the national fusion materials program must evaluate these effects without assistance from other reactor programs. The working group on flow processes and properties was concerned with… more
Date: February 1, 1981
open access

DOE's energy data base (EDB) versus other energy-related data bases: a comparative analysis

Description: The release of the DOE Energy Data Base to commercial services in 1980 raised an immediate question in the minds of some searchers: how does this new data base fit into the spectrum of already-available data bases. Because the authors have been closely associated with the Department of Energy's RECON system and its data bases for several years, as trainers and as editor of the DOE/RECON Newsletter, the question was of great interest and we decided to investigate it.
Date: February 1, 1981
Creator: Robinson, J. & Hu, M.
open access

Effect of couple-stress on the pure bending of a prismatic bar

Description: An evaluation of the applicability of the couple-stress theory to the stress analysis of graphite structures is performed by solving a pure bending problem. The differences between solutions from the couple-stress theory and from the classical theory of elasticity are compared. It is found that the differences are sufficient to account for the inconsistencies which have often been observed between the classical elasticity theory and actual behavior of graphite under bend and tensile loadings. A… more
Date: February 1, 1981
Creator: Tzung, F.; Kao, B.; Ho, F. & Tang, P.
open access

Effects of Anomalous Transport on Lower Hybrid Electron Heating

Description: The transport of electron energy out of tokamaks is known to be far greater than that calculated using classical and neoclassical theory. However, low levels of non-axisymmetric magnetic field turbulence can couple the fast transport of electrons parallel to the magnetic field lines to radial transport, thus providing a plausible explanation for observed energy confinement. These models further predict that the electron loss rate is proportional to v/sub parallel bars/. This has subsequently be… more
Date: February 1, 1981
Creator: McCoy, M. G. & Harvey, R. W.
open access

Electrofibrous prefilters for use in nuclear ventilation systems

Description: We have established a comprehensive program for the US Department of Energy to develop electrofibrous prefilters to extend the life of High Efficiency Particulate Air (HEPA) filters that are used in the nuclear industry. We have selected the electrofibrous filter because, compared to the mechanical fibrous filter, it has a higher efficiency and longer lifetime. Two different electrofibrous filters have been developed for use in nuclear ventilation systems. One prototype is a stationary prefilte… more
Date: February 19, 1981
Creator: Bergman, W.; Kuhl, W. D.; Russell, W. L.; Taylor, R. D.; Hebard, H. D.; Biermann, A. H. et al.
open access

Electroforming copper targets for RTNS-II

Description: Copper targets used in RTNS II, which is the world's most intense 14-MeV neutron source, contain water cooling channels for temperature control. There are two methods for fabricating these targets: (1) diffusion bonding a copper panel containing photoetched channels to another copper panel, and (2) an electroforming technique which involves filling the photoetched channels with wax, plating thick copper to seal over the channels and then removing the wax. Development of this latter process and … more
Date: February 6, 1981
Creator: Kelley, W. K.; Dini, J. W. & Logan, C. M.
open access

An Electron Microprobe Determination of Microscopic Elemental Homogeneity of Hot-Cross-Rolled and High-Energy-Rate Forged 21Cr-6Ni-9Mn Steel

Description: Electron microprobe analysis shows that iron, manganese, and nickel are inhomogeneously distributed in hot-cross-rolled plate and high-energy-rate forgings of 21Cr-6Ni-9Mn steel but that chromium is homogeneously distributed. Increases in iron content correlate with decreases in manganese and nickel. Rolling and forging flow lines occur in regions with high iron and low manganese and nickel. High-energy-rate forging increases inhomogeneity. Inhomogeneities are suspected to exist in the original… more
Date: February 17, 1981
Creator: Mosley, W. C.
open access

Environmental decontamination

Description: The record of the proceedings of the workshop on environmental decontamination contains twenty-seven presentations. Emphasis is placed upon soil and surface decontamination, the decommissioning of nuclear facilities, and assessments of instrumentation and equipment used in decontamination. (DLS)
Date: February 1, 1981
Creator: Cristy, George A. & Jernigan, Helen C.
open access

Estimate of coherent tune shifts for PEP

Description: Transverse and longitudinal instabilities for a bunched PEP beam with a Gaussian distribution are treated using the standard technique in which instability problems are solved by looking for eigenvalues of the linearized Vlasov equation. The eigen solutions are conveniently expanded in terms of the Laquerre polynomials, and the eigenvalues are given by a symmetric matrix whose elements can be expressed in infinite series. The well-known formalism is used to obtain the matrix formula, and then a… more
Date: February 1, 1981
Creator: Yao, C.Y. & Chao, A.W.
open access

Evaluation of the seismic integrity of a plutonium-handling facility

Description: Many studies have been made by and for the Lawrence Livermore National Laboratory (LLNL) to ensure the seismic safety of its Plutonium Facility (Building 332). These studies have included seismological and geologic field investigations to define the actual seismic hazard existing at the Laboratory site as well as structural studies of the Facility itself. Because the basic seismic design criteria has undergone changes over the years, numerous structural studies and upgrades have been completed.… more
Date: February 4, 1981
Creator: Coats, D.W.
open access

FERMI: a code for modeling field-reversed magnetic-mirror fusion devices

Description: We present the design and implementation for the array processor of FERMI, a code for modeling the physics of field-reversed magnetic-mirror fusion machines. The physical model is described briefly, along with a discussion of important physical effects that this code can model. We show that the code results are in agreement with theoretical predictions.
Date: February 1, 1981
Creator: Brengle, T.A. & Cohen, B.I.
open access

Fluid and structural dynamic design considerations of the HYLIFE nozzle plate

Description: The basic concept of the High Yield Lithium Injection Fusion Energy (HYLIFE) reaction chamber involves a falling liquid-metal (lithium) jet array that absorbs 90% of the energy released from inertial confinement fusion reactions. The key element of the chamber that produces the jet array is the nozzle plate. This paper describes the design and analysis of a nozzle plate which can withstand the structural loads and permit the fluid jet array to be reestablished for a 1-Hz fusion reaction frequen… more
Date: February 1, 1981
Creator: Pitts, J.H. & Ojalvo, I.U.
open access

HIGH CURRENT D- PRODUCTION BY CHARGE EXCHANGE IN SODIUM

Description: A beam of D{sup -} ions has been produced at 7-13 keV, with currents up to 2.2 {angstrom}, using charge exchange in sodium vapor. The beam profile is bi-Gaussian with angular divergence 0.7{sup o} x 2.8{sup o} and peak current density 15 mA/cm{sup 2}. The characteristics of the beam are in excellent agreement with predictions based on atomic cross sections. The sodium vapor target is formed by a jet directed across the beam. The sodium density drops rapidly in the beamline downstream from the c… more
Date: February 1, 1981
Creator: Hooper, E.B.; Poulsen, P. & Pincosy, P.A.
open access

High-current, short-pulse, RF-synchronized electron gun for the Stanford Linear Accelerator

Description: For the generation of intense single and multiple bunches of electrons (> 8 nc per bunch) for accelerator studies at SLAC, a high peak current photoemission electron gun has been developed. A gallium arsenide photocathode is illuminated by the optical beam from a frequency doubled, actively mode-locked and Q-switched Nd:YAG laser. The mode-locked optical pulses are of variable, sub-nanosecond width and occur with a spacing of 8.4 nsec, synchronized with the 2856 MHz accelerator rf. The gun is d… more
Date: February 1, 1981
Creator: Sinclair, Charles K. & Miller, Roger H.
open access

High Resolution Scanning Auger Microscopic Investigation of Intergranular Fracture in as-Quenched Fe-12Mn

Description: Previous research in this laboratory led to the conclusion that the low temperature intergranular fracture mode in Fe-Mn alloys is microstructurally determined, and does not require metalloid segregation or other chemical contamination. That conclusion was tested in the present investigation, which used high resolution scanning Auger microscopy to study the intergranular fracture surfaces. The fracture mode at liquid nitrogen temperature was found to be intergranular fracture whenever the alloy… more
Date: February 1, 1981
Creator: Lee, H. J. & Morris, J. W., Jr.
open access

Hydrogen and deuterium trapping in iron

Description: The research described is directed at present almost exclusively to hydrogen transport, including both chemical and physical trapping, in iron and iron-base alloys. Some attention is directed to isotope effects. Efforts are made to clarify and understand hydrogen-related phenomena which are believed to be of direct importance to practical performance.
Date: February 1, 1981
Creator: Johnson, Herbert H. & Lin, R. W.
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