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VTK-m Users' Guide (Version 0.0)

Moreland, Kenneth D.

VTK-m is written in C++ and makes extensive use of templates. The toolkit is implemented as a header library, meaning that all the code is implemented in header files (with extension .h) and completely included in any code that uses it. This is typically necessary of template libraries, which need to be compiled with template parameters that are not known until they are used. This also provides the convenience of allowing the compiler to inline user code for better performance.

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TYPE Other Report YEAR 2015
DOIOSTI

Radiation Characterization Summary: ACRR Polyethylene-Lead-Graphite (PLG) Bucket Located in the Central Cavity on the 32-Inch Pedestal at the Core Centerline (ACRR-PLG-CC-32-cl)

Parma, Edward J.; Vehar, David W.; Lippert, Lance L.; Griffin, Patrick J.; Naranjo, Gerald E.; Luker, Spencer M.

This document presents the facility-recommended characterization of the neutron, prompt gamma-ray, and delayed gamma-ray radiation fields in the Annular Core Research Reactor (ACRR) for the polyethylene-lead-graphite (PLG) bucket in the central cavity on the 32-inch pedestal at the core centerline. The designation for this environment is ACRR-PLG-CC-32-cl. The neutron, prompt gamma-ray, and delayed gamma-ray energy spectra, uncertainties, and covariance matrices are presented as well as radial and axial neutron and gamma-ray fluence profiles within the experiment area of the bucket. Recommended constants are given to facilitate the conversion of various dosimetry readings into radiation metrics desired by experimenters. Representative pulse operations are presented with conversion examples. Acknowledgements The authors wish to thank the Annular Core Research Reactor staff and the Radiation Metrology Laboratory staff for their support of this work. Also thanks to David Ames for his assistance in running MCNP on the Sandia parallel machines.

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TYPE SAND Report YEAR 2015
DOIOSTI

LEH Transmission and Early Fuel Heating for MagLIF with Z-Beamlet

Geissel, Matthias; Harvey-Thompson, Adam J.; Awe, Thomas J.; Campbell, Edward M.; Gomez, Matthew R.; Harding, Eric H.; Jennings, Christopher A.; Kimmel, Mark; Knapp, P.F.; Lewis, Sean M.; Mcbride, Ryan; Peterson, K.J.; Schollmeier, Marius; Schmit, Paul; Sefkow, Adam B.; Shores, Jonathon; Sinars, Daniel; Slutz, Stephen A.; Smith, Ian C.; Speas, Christopher S.; Stahoviak, J.W.; Vesey, Roger A.; Porter, John L.

Abstract not provided.

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TYPE Conference Poster YEAR 2015
OSTI

25th International Training Course (ITC-25) on the Physical Protection of Nuclear Facilities and Materials Evaluation Report

Overholt, Michelle J.

The goal of this evaluation report is to provide the information necessary to improve the effectiveness of the ITC provided to the International Atomic Energy Agency Member States. This report examines ITC-25 training content, delivery methods, scheduling, and logistics. Ultimately, this report evaluates whether the course provides the knowledge and skills necessary to meet the students’ needs in the protection of nuclear materials and facilities.

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TYPE SAND Report YEAR 2015
DOIOSTI

Public Preferences Related to Radioactive Waste Management Nuclear Energy and Environment: Methodology and Response Reference Report for the 2014 Energy and Environment Survey

Herron, Kerry G.; Jenkins-Smith, Hank C.; Silva, Carol L.; Gupta, Kuhika

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TYPE SAND Report YEAR 2015
DOIOSTI

Software Support for Transiently Powered Computers

Van Der Woude, Joel

With the continued reduction in size and cost of computing, power becomes an increasingly heavy burden on system designers for embedded applications. While energy harvesting techniques are an increasingly desirable solution for many deeply embedded applications where size and lifetime are a priority, previous work has shown that energy harvesting provides insufficient power for long running computation. We present Ratchet, which to the authors knowledge is the first automatic, software-only checkpointing system for energy harvesting platforms. We show that Ratchet provides a means to extend computation across power cycles, consistent with those experienced by energy harvesting devices. We demonstrate the correctness of our system under frequent failures and show that it has an average overhead of 58.9% across a suite of benchmarks representative for embedded applications.

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TYPE Thesis or Dissertation YEAR 2015
OSTI

Cable Braid Electromagnetic Penetration Model

Warne, Larry K.; Langston, William L.; Basilio, Lorena I.; Johnson, William A.

The model for penetration of a wire braid is rigorously formulated. Integral formulas are developed from energy principles and reciprocity for both self and transfer immittances in terms of potentials for the fields. The detailed boundary value problem for the wire braid is also setup in a very efficient manner; the braid wires act as sources for the potentials in the form of a sequence of line multipoles with unknown coefficients that are determined by means of conditions arising from the wire surface boundary conditions. Approximations are introduced to relate the local properties of the braid wires to a simplified infinite periodic planar geometry. This is used in a simplified application of reciprocity to be able to treat nonuniform coaxial geometries including eccentric interior coaxial arrangements and an exterior ground plane.

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TYPE SAND Report YEAR 2015
DOIOSTI

ASCR Workshop on Quantum Computing for Science

Aspuru-Guzik, Alan; Van Dam, Wim; Farhi, Edward; Gaitan, Frank; Humble, Travis; Jordan, Stephen; Landahl, Andrew J.; Love, Peter; Lucas, Robert; Preskill, John; Muller, Richard P.; Svore, Krysta; Wiebe, Nathan; Williams, Carl

This report details the findings of the DOE ASCR Workshop on Quantum Computing for Science that was organized to assess the viability of quantum computing technologies to meet the computational requirements of the DOE’s science and energy mission, and to identify the potential impact of quantum technologies. The workshop was held on February 17-18, 2015, in Bethesda, MD, to solicit input from members of the quantum computing community. The workshop considered models of quantum computation and programming environments, physical science applications relevant to DOE's science mission as well as quantum simulation, and applied mathematics topics including potential quantum algorithms for linear algebra, graph theory, and machine learning. This report summarizes these perspectives into an outlook on the opportunities for quantum computing to impact problems relevant to the DOE’s mission as well as the additional research required to bring quantum computing to the point where it can have such impact.

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TYPE Other Report YEAR 2015
DOIOSTI

Investigating the Effects of Adding a Center jet to Argon gas puff implosions at the Z facility

Harvey-Thompson, Adam J.; Jennings, Christopher A.; Jones, Brent M.; Ampleford, David J.; Hansen, Stephanie B.; Lamppa, Derek C.; Cuneo, Michael E.; Reneker, Joseph; Johnson, Drew; Jones, Michael; Moore, Nathan W.; Flanagan, Timothy M.; Mckenney, John; Rochau, G.A.; Waisman, Eduardo M.; Coverdale, Christine A.; Apruzese, John P.; Thornhill, J.W.; Giuliani, J.L.

Abstract not provided.

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TYPE Conference Poster YEAR 2015
OSTI

Delta: Data Reduction for Integrated Application Workflows

Lofstead, Gerald F.; Jean-Baptiste, Gregory; Oldfield, Ron

Integrated Application Workflows (IAWs) run multiple simulation workflow components concurrently on an HPC resource connecting these components using compute area resources and compensating for any performance or data processing rate mismatches. These IAWs require high frequency and high volume data transfers between compute nodes and staging area nodes during the lifetime of a large parallel computation. The available network band-width between the two areas may not be enough to efficiently support the data movement. As the processing power available to compute resources increases, the requirements for this data transfer will become more difficult to satisfy and perhaps will not be satisfiable at all since network capabilities are not expanding at a comparable rate. Furthermore, energy consumption in HPC environments is expected to grow by an order of magnitude as exascale systems become a reality. The energy cost of moving large amounts of data frequently will contribute to this issue. It is necessary to reduce the volume of data without reducing the quality of data when it is being processed and analyzed. Delta resolves the issue by addressing the lifetime data transfer operations. Delta removes subsequent identical copies of already transmitted data during transfers and restores those copies once the data has reached the destination. Delta is able to identify duplicated information and determine the most space efficient way to represent it. Initial tests show about 50% reduction in data movement while maintaining the same data quality and transmission frequency.

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TYPE SAND Report YEAR 2015
DOIOSTI

Trends in Microfabrication Capabilities & Device Architectures

Bauer, Todd M.; Jones, Adam; Lentine, Anthony L.; Mudrick, John P.; Okandan, Murat; Rodrigues, Arun

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TYPE Other Report YEAR 2015
DOIOSTI

Fact Sheet: Radiopharmaceuticals

Godino, Jules

Radiopharmaceuticals are drugs that use radioactive material to treat or diagnose disease. These drugs can also be referred to as medical radioisotopes. Radiopharmaceuticals help to provide doctors with an image of a patient’s internal organs through a noninvasive procedure. Less frequently, radioisotopes are used for treatment of cancer and other diseases, this is known as radiation therapy or radio immunotherapy.

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TYPE Other Report YEAR 2015
DOIOSTI

Report on a Zero-Knowledge Protocol Tabletop Exercise

Marleau, P.; Brubaker, E.; Deland, Sharon M.; Hilton, Nathan R.; Mcdaniel, Michael; Schroeppel, Richard C.; Seager, Kevin D.; Stoddard, Mary C.; Macarthur, Duncan

This report summarizes the discussion and conclusions reached during a table top exercise held at Sandia National Laboratories, Albuquerque on September 3, 2014 regarding a recently described approach for nuclear warhead verification based on the cryptographic concept of a zero-knowledge protocol (ZKP) presented in a recent paper authored by Glaser, Barak, and Goldston. A panel of Sandia National Laboratories researchers, whose expertise includes radiation instrumentation design and development, cryptography, and arms control verification implementation, jointly reviewed the paper and identified specific challenges to implementing the approach as well as some opportunities. It was noted that ZKP as used in cryptography is a useful model for the arms control verification problem, but the direct analogy to arms control breaks down quickly. The ZKP methodology for warhead verification fits within the general class of template-based verification techniques, where a reference measurement is used to confirm that a given object is like another object that has already been accepted as a warhead by some other means. This can be a powerful verification approach, but requires independent means to trust the authenticity of the reference warhead - a standard that may be difficult to achieve, which the ZKP authors do not directly address. Despite some technical challenges, the concept of last-minute selection of the pre-loads and equipment could be a valuable component of a verification regime.

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TYPE SAND Report YEAR 2015
DOIOSTI
Results 47801–48000 of 99,299
Results 47801–48000 of 99,299