The authors compare CALE simulations with recent experimental results of a laser-induced shock traversing a spherical under-dense region (''void''). In this report the experimental results are described, as well as several numerical attempts at explaining the observed radiographs. The conclusion is that the numerical simulations at this time cannot satisfactorily explain the experiment. The simulations also indicate that the introduction of air gaps between the under-dense sphere and the surrounding foam can greatly change the behavior of the shocked sphere. Thus fabrication details may play an important role in the detailed evolution of this experiment. Regardless of the simulations, analysis of the observed time sequence indicates that reproducibility of this experiment may be a factor. To settle this issue, further experiments of this kind will be required.

This report documents results from tests conducted to evaluate the impacts of elevated levels of oxalate on operations within the SRS High-Level Waste System. These operations include sludge washing, evaporation, mixing of supernates and wash waters and pretreatment of supernates to remove strontium and actinides by monosodium titanate.

Under the Low Curie Salt Program, interstitial liquid is being drained from saltcake in Tank 41 to remove most of the Cs-137 activity. The program is contingent upon reducing residual liquid content, and thru residual Cs-137 content, to a sufficiently low level.

The Soils and Groundwater Closure Projects Reactor Team requested support from the Environmental Sciences and Technology Department of the Savannah River Technology Center to conduct a source term determination for the P Area Reactor Groundwater Operable Unit. The identified documents reviewed and pertinent findings are recorded in this report.

This review was compiled to summarize the technologies currently being investigated to remove arsenic from drinking waters, with a special focus on developing and third-world countries where the problem is exacerbated by flooding and depressed economic conditions. The reason for compiling this report is to provide background material and a description of competing technologies currently described in the literature for arsenic removal. Based on the sophistication and applicability of current technologies, Argonne National Laboratory may develop an improved method based on magnetic particle technology. Magnetic particle sorbents may afford improved reaction rates, facilitate particle-water separation, and offer reusability. Developing countries like Vietnam and Bangladesh cannot afford expensive, large-scale treatments to remove arsenic from drinking waters to acceptable limits (from 50 ppb to 10 ppb, depending on the country). Low-cost, effective technologies that can be readily available at the household or community level are needed to solve the present crisis. Appropriate technologies should meet certain criteria, including the following: The treatment must be applicable over a wide range of arsenic concentrations; It should be easy to use without running water or electricity; and The materials for the treatment should be cheap and readily available, and/or suitable for reuse. Our review of …

Based on experimental studies with simulated and actual wastes, we recommend adopting the use of 0.1-micron pore-size, sintered stainless-steel filter elements within the design of the Salt Waste Processing Facility. Furthermore, adopting the smaller pore size elements for the Actinide Removal Process would result in a significant risk to the start-up schedule due to delays for buying, installing, and testing new equipment. The existing 0.5-micron pore-size filters will provide nearly equivalent service with no additional capital investment. Unless the planned filter test at Building 512-S fails to meet specifications, the project should proceed with the existing equipment, including spares. When the existing equipment reaches the end of the service life, management can consider replacement with the smaller pore-size elements. The laboratory studies indicate that use of the smaller pore size equipment will result in greater protection against particulate fines passing to downstream facilities while giving equivalent or superior processing rates than provided by the 0.5-micron elements.

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Various options for sequential, shared memory and distributed memory implementations for the CLJP algorithm, a parallel coarsening scheme within algebraic multigrid, are discussed. The use of different data structures as well as different approaches of implementing the actual algorithm are investigated, and experimental results illustrating the results are presented.

Since fall 2001, Livermore Computing at Lawrence Livermore National Laboratory has deployed 11 Intel IA-32-based Linux clusters ranging in size up to 1154 nodes. All provide a common programming model and implement a similar cluster architecture. Hardware components are carefully selected for performance, usability, manageability, and reliability and are then integrated and supported using a strategy that evolved from practical experience. Livermore Computing Linux clusters run a common software environment that is developed and maintained in-house while drawing components and additional support from the open source community and industrial partnerships. The environment is based on Red Hat Linux and adds kernel modifications, cluster system management, monitoring and failure detection, resource management, authentication and access control, development environment, and parallel file system. The overall strategy has been successful and demonstrates that world-class high-performance computing resources can be built and maintained using commodity off-the-shelf hardware and open source software.

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The Rare Isotope Accelerator project involves generating heavy element ion beams for use in a fragmentation target line to produce selected ion beams for physics research experiments. The main beam and fission fragments, after passing through the target, are collected and passed along by a series of collecting magnets and a dipole magnet. In the first dipole magnet, the main beam impacts onto a beam dump located on each side of the magnet vacuum chamber. A dump design that involves rotating cylinders and internal water cooling passages has been designed to absorb the glancing impact of the main beam. The beam power designed for is 100 kW and water cooling is by turbulent sub-cooled forced convection.

We describe simulations of the beam dynamics in the storage ring (Boomerang), a 3-GeV third-generation light source being designed for the Australian Synchrotron Project[1]. The simulations were performed with the code Goemon[2]. They form the basis for design specifications for storage ring components (apertures, alignment tolerances, magnet quality, etc.), and for determining performance characteristics such as coupling and beam lifetime.

Multi-modality imaging studies are becoming more widely utilized in the analysis of medical data. Anatomical data from CT and MRI are useful for analyzing or further processing functional data from techniques such as PET and SPECT. When data are not acquired simultaneously, even when these data are acquired on a dual-imaging device using the same bed, motion can occur that requires registration between the reconstructed image volumes. As the human torso can allow non-rigid motion, this type of motion should be estimated and corrected. We report a deformation registration technique that utilizes rigid registration for bony structures, while allowing elastic transformation of soft tissue to more accurately register the entire image volume. The technique is applied to the registration of CT and MR images of the lumbar spine. First a global rigid registration is performed to approximately align features. Bony structures are then segmented from the CT data using semi-automated process, and bounding boxes for each vertebra are established. Each CT subvolume is then individually registered to the MRI data using a piece-wise rigid registration algorithm and a mutual information image similarity measure. The resulting set of rigid transformations allows for accurate registration of the parts of the CT and …