A 3.4-meter direct-reading spectrograph is being used with an inductively coupled plasma source for the simultaneous determination of Ag, Bi, Cd, Cu, Nb, Ni, Pb, Sn, and W in water samples. We have attached a small digital computer to the system in order to obtain intensity data on each element once a second. After the intensities during a run on a sample have stabilized, the computer records the intensity data and outputs the average concentration for each element. To approach the published detection limits, a peristaltic pump must be used to force the water sample into the usual cross-flow nebulizer. We have studied several different nebulizer designs with the goal of improving efficiency and hence sensitivity. One design, the fritted-disk nebulizer, has an efficiency over 60 percent, as compared with the 5 percent efficiency of the original nebulizer.

The large amount of field and laboratory data collected by the Hydrogeochemical and Stream Sediment Reconnaissance Program contractors of the National Uranium Resource Evaluation (NURE) Program necessitates the use of computerized data verification procedures. The Oak Ridge National Laboratory data verification procedures consist of computerized checks of the validity of codes for every field of data reported. The verification procedures are part of an overall data evaluation system. Sample locations are checked from computerized plots of locations. Laboratory data ara analyzed statistically, and unusual samples are identified and selectively reanalyzed in the laboratory. The final verification step is the evaluation of the data by geologists to ensure the overall consistency of the reported results. The computerization of these procedures enables a rapid verification process. The following sections present an explanation of each aspect of data collection and a brief description of the data verification procedures used by the Oak Ridge program.

In analyzing the response of loosely stacked hexagonal blocks during a seismic event in the High-Temperature Gas Cooled Reactor (HTGR), a spring-mass-damper model was used to approximate the velocity and the impact configuration of core blocks and a finite element model was used to estimate the dynamic stress, the coefficient of restitution, and the contact time for the impact of two or more blocks. The latter approach is discussed.

In radiation therapy treatment volumes up to several liters have to be irradiated. Today's charged particle programs use ridge filters, scattering foils, occluding rings collimators and boluses to shape the dose distribution. An alternative approach, scanning of a small diameter beam, is analyzed and tentative systems specifications are derived. Critical components are scheduled for fabrication and testing at LBL.

A review is given of electron-correlation satellites in ion and atom emission spectra. The topics developed are the early history using Mn/sup 2 +/ as an example, shake-up satellites and initial-state-configuration interaction (ISCI), direct observation of ISCI by photoemission: the ns/sup 2/ case, and autoionization in Ba and other np/sup 6/ (n + 1)s/sup 2/ cases. (JFP)

Data from two experiments are presented to illustrate the use of laser optical microdiffraction in metallurgical analysis: ordered Mg/sub 3/Cd and spinodal Au--Ni alloys. (DLC)

Switching and power supply problems of neutral atom beam injection systems and superconducting magnets are briefly discussed. Typical power supplies for both systems are described.

The observation is reported of rotationally inelastic scattering in the He + HD system in a crossed molecular beam experiment conducted at a collision energy of 19.3 MeV, low enough that only the J = 0 ..-->.. J = 1 rotational excitation occurs. (GHT)

An integrating sphere technique was used for the measurement of the total and specular reflectance of vacuum-evaporated aluminum films. The appearance of the surface to the naked eye was relatively insensitive to the total reflectance, but was very closely related to the fraction of reflected light that was specularly reflected. Milky or cloudy-appearing aluminum films had a low specular reflectance while mirror-like films had a high specular reflectance. Surface specular reflectance was in turn closely related to film microtopography; roughening features such as hillocks substantially reduced film shininess and hence specular reflectance. Although no extensive study to relate reflectance to deposition parameters was undertaken, specular reflectance was found to be very sensitive to chamber pressure during evaporation. Two alternate techniques for surface appearance measurements were evaluated and correlated with the integrating sphere method; these techniques yielded relative assessments of film shininess that corresponded well with visual appearance and integrating sphere results.

Some findings of a study concerning a computer based control and monitoring system for the proposed ISABELLE Intersecting Storage Accelerator are presented. Requirements for development and implementation of such a system are discussed. An architecture is proposed where the system components are partitioned along functional lines. Implementation of some conceptually significant components is reviewed.

The strong influence of the fine-scale microstructural features on mechanical properties has become increasingly evident during the past decade. This is particularly true for fracture toughness of quenched and tempered alloy steels. Large differences in microstructure can be produced by isothermal, rather than athermal, treatments in the bainite and upper martensite temperature ranges. The kinetics of transformation as well as the kinds and volume fractions of transformation products can be varied over wide ranges by relatively small changes in chemical composition. The effects of the common alloying elements on transformation kinetics, both separately and in various combinations were determined experimentally. The synergistic effects of individual elements added as pairs of elements were not predictable from a knowledge of the effects of the individual elements. Isothermal treatments, coupled with variations in the kinds and amounts of alloying elements, produced different morphologies, compositions, and volume fractions of the transformation products. The effects of such microstructural differences on tensile properties, fracture toughness, and fatigue characteristics were evaluated. Beneficial effects were found, such as substantial increases in fracture toughness, with small changes in alloy content or with heat treatments that differed from those conventionally used.

This talk deals with {Lambda}, K{sub s}{sup 0} and {bar {Lambda}} production with 14.5 GeV/c Silicon beams. Why study {Lambda}{sup 0} production Because the study of strangeness is an important part of the search for Quark Gluon Plasma (QGP). Many models predict an enhancement of strangeness in a QGP as compared to the amount of strangeness produced in a superposition of nucleon-nucleon interactions. The amount of enhancement varies from model to model. Even if no QGP is detected at AGS energies using Si beams, it is important to understand the production mechanisms in quantitative detail so that standard nucleon-nucleon production mechanism can be distinguished from QGP formation. The advantage of measuring strangeness production by measuring V{sup 0} production is that V{sup 0}'s can be identified by kinematics without the use of any special particle ID detectors. The disadvantage is that usually large aperture detectors are required. Experiment 810 has the needed large aperture. This talk describes the technique and results of V{sup 0} production from {approximately}9000 interactions of Si in a 1 mil (25 micron) Au target recorded in June 1989. 13 figs., 1 tab.

The presentation of US research programs at the last IWG-RRPC meeting emphasized several aspects of the work sponsored by the Nuclear Regulatory Commission (NRC). The remarks given this year will focus on work that relates to pressurized water reactor primary pressure vessels. While most of the comments are relative to NRC work, some are included relative to the Electric Power Research Institute (EPRI) and the Department of Energy. Additionally, a forthcoming CSNI workshop on fracture methodology validation will be described. 36 figs.

A system simulator has been implemented to aid the development of the RHIC position monitor system. Based on the LabVIEW software package by National Instruments, this simulator allows engineers and technicians to interactively explore the parameter space of a system during the design phase. Adjustable parameters are divided into three categories: beam, pickup, and electronics. The simulator uses these parameters in simple formulas to produce results in both time-domain and frequencydomain. During the prototyping phase, these simulated results can be compared to test data acquired with the same software package. The RHIC position monitor system is presented as an example, but the software is applicable to several other systems as well.

Several contemporary proton-recoil detectors are described and compared. These detectors have been used for neutron-spectrum measurements over various portions of the 10-keV-to-20-MeV energy range. Several factors which limit the accuracy of the results are compared quantitatively. General suggestions are given for setting and using standard cross sections and for future developments using the n,p scattering reaction.

The article reviews the new theoretical developments for the CP-parameter {epsilon}{prime}/{epsilon} and its intimate connection with the mass of a heavy top quark. 22 refs., 8 figs., 1 tab.

An area in south Texas of 33,000 km/sup 2/ was sampled in order to test and demonstrate the applicability of the two-phase regional geochemical survey techniques developed for the National Uranium Resource Evaluation Project. In the first phase stream sediment and stream water samples are collected from basins of approximately 260 km/sup 2/, whereas in the second phase the samples are collected from basins of approximately 26 km/sup 2/. Well samples are taken at 10 mile spacings in phase I and 3.2 mile spacings in phase II. Geochemical trends were defined by contouring, weighted sums, and cluster analysis. The results obtained are reported and discussed in detail. They indicate that phase I samples accurately define the area in which phase II sampling should be conducted. Well water was the most useful parameter for identifying potential uranium mineralization, but multiple sample types proved useful. Multielement data clearly aided interpretation of uranium trends. (JSR)

The Na/K ratio in geothermal well waters provides a better estimate of the relative stability of low albite and potash feldspar than do predictions from calorimetry and high temperature phase equilibria. The calculated saturation indices from field data for low albite, potash feldspar suggest that [Delta]G[sub f,298][sup o] for the latter should be revised to [minus]3748.6[plus minus]3.7 kJ.mol[sup [minus]1].

We have examined the effects of irradiation with 200-keV helium ions on the adhesion and optical transmission properties of 220 nm thick antireflective, optical coatings that consisted of layers of spherical, 20 nm diameter silica particles. In the as-deposited state these sol-gel coatings have very low adhesion to the fused silica subtrates. Results for adhesion and optical transmission have been obtained for doses of 10/sup 13/-10/sup 17/ Hecm/sup 2/. Significant improvement in adhesion was found for doses exceeding about 2 /times/ 10/sup 14/ Hecm/sup 2/. Optical transmission measurements for wavelengths of 200-1200 nm showed increasing absorption with dose. We have evidence that the helium ions decompose various contaminants in the coating into two types of degradation products. One is volatile and the other remains in the coating as optically absorbing species. UVoxidative-gas treatment effectively removes the absorbing species.

Optical model elastic and DWBA transfer angular distributions are studied by isolating their positive and negative deflection angle components. The local angular momentum of these amplitudes allows isolation of the regions of angular momentum space that are contributing to the different angular regions of the cross sections. This information can be employed to isolate features of the cross sections arising from orbiting, reflection, Coulomb rainbows, nuclear rainbows, Regge poles, etc. Specifically it is shown that the inner contribution to typical heavy-ion forward-angle elastic scattering is in the shadow of the nuclear rainbow and further that transfer angular distributions contain separate inner and outer contributions. Before discussing results, the idea of a ''local momentum'' is introduced and the decomposition of angular distributions into their positive and negative deflection angle components is briefly described. Results are shown for the reaction /sup 60/Ni(/sup 13/C,/sup 12/C)/sup 61/Ni at E = 60.8 MeV and for the elastic scattering of /sup 13/C on /sup 60/Ni at the same incident energy. (SDF)

The elements of a Nd: Glass laser chain as it is constructed for fusion experiments are described. A brief overview of the ARGUS and SHIVA systems employing Nd lasers is given. (MOW)

The Minibeam Facility is a biomedical heavy-ion beam area at the Bevalac designed to satisfy the following requirements: (1) provide a beam incident in a vertical plane for experiments where a horizontal apparatus significantly increases the convenience of performing an experiment or even determines its feasibility; (2) provide an area that is well shielded with respect to electronic interference so that microvolt signals can be detected with acceptable signal-to-noise ratios; (3) provide a beam of small diameter, typically a few millimeters or less, for various studies of cellular function; and (4) provide a facility for experiments that require long setup and preparation times and apparatus that must be left relatively undisturbed between experiments and that need short periods of beam time. The design of such a facility and its main components is described. In addition to the above criteria, the design was constrained by the desire to have inexpensive, simple devices that work reliably and can be easily upgraded for interfacing to the Biomedical PDP 11/45 computer.

This report discusses the antiproton source beamline elements and the energy deposition and radiation shielding for a antiproton source. (LSP).

Space charge as it affects ion beam transport is reviewed. The approach here will be to derive beam-current criteria for divergence from space charge, review recent theoretical models for fractional space-charge neutralization, discuss space-charge-related observations on ion-beam transport in a specific experimental system, and briefly note several applications using space charge. Experimental measurements of effective space charge are discussed for a dc ion-source test stand using a 90/sup 0/ double-focusing magnet for species separation and for a solenoidal lens magnet for trim focus of the ion beam preparatory to entrance into a 400-kV accelerator column.