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Title: Gamma ray spectroscopy for fusion and basic science research

  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

McEvoy, Aaron Matthew. Gamma ray spectroscopy for fusion and basic science research. United States: N. p., 2015. Web. doi:10.2172/1215807.
McEvoy, Aaron Matthew. Gamma ray spectroscopy for fusion and basic science research. United States. doi:10.2172/1215807.
McEvoy, Aaron Matthew. Wed . "Gamma ray spectroscopy for fusion and basic science research". United States. doi:10.2172/1215807.
title = {Gamma ray spectroscopy for fusion and basic science research},
author = {McEvoy, Aaron Matthew},
abstractNote = {},
doi = {10.2172/1215807},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Sep 16 00:00:00 EDT 2015},
month = {Wed Sep 16 00:00:00 EDT 2015}

Technical Report:

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  • The mission of the U.S. Department of Energy Office of Science (DOE SC) is the delivery of scientific discoveries and major scientific tools to transform our understanding of nature and to advance the energy, economic, and national security missions of the United States. To achieve these goals in today’s world requires investments in not only the traditional scientific endeavors of theory and experiment, but also in computational science and the facilities that support large-scale simulation and data analysis. The Advanced Scientific Computing Research (ASCR) program addresses these challenges in the Office of Science. ASCR’s mission is to discover, develop, andmore » deploy computational and networking capabilities to analyze, model, simulate, and predict complex phenomena important to DOE. ASCR supports research in computational science, three high-performance computing (HPC) facilities — the National Energy Research Scientific Computing Center (NERSC) at Lawrence Berkeley National Laboratory and Leadership Computing Facilities at Argonne (ALCF) and Oak Ridge (OLCF) National Laboratories — and the Energy Sciences Network (ESnet) at Berkeley Lab. ASCR is guided by science needs as it develops research programs, computers, and networks at the leading edge of technologies. As we approach the era of exascale computing, technology changes are creating challenges for science programs in SC for those who need to use high performance computing and data systems effectively. Numerous significant modifications to today’s tools and techniques will be needed to realize the full potential of emerging computing systems and other novel computing architectures. To assess these needs and challenges, ASCR held a series of Exascale Requirements Reviews in 2015–2017, one with each of the six SC program offices,1 and a subsequent Crosscut Review that sought to integrate the findings from each. Participants at the reviews were drawn from the communities of leading domain scientists, experts in computer science and applied mathematics, ASCR facility staff, and DOE program managers in ASCR and the respective program offices. The purpose of these reviews was to identify mission-critical scientific problems within the DOE Office of Science (including experimental facilities) and determine the requirements for the exascale ecosystem that would be needed to address those challenges. The exascale ecosystem includes exascale computing systems, high-end data capabilities, efficient software at scale, libraries, tools, and other capabilities. This effort will contribute to the development of a strategic roadmap for ASCR compute and data facility investments and will help the ASCR Facility Division establish partnerships with Office of Science stakeholders. It will also inform the Office of Science research needs and agenda. The results of the six reviews have been published in reports available on the web at This report presents a summary of the individual reports and of common and crosscutting findings, and it identifies opportunities for productive collaborations among the DOE SC program offices.« less
  • Contents include: electron-capture decay of cosmic-rays; cosmic ray heavy ions at and above 40,000 feet; neutron-generated single-event upsets in the atmosphere; nuclear cross sections, cosmic-ray propagation, and source composition; radiation transport of cosmic-ray nuclei in lunar material and radiation doses; nongeometric behavior of nucleus-nucleus total inelastic cross sections; environmental models for single-event upset estimation; uncertainties in cosmic ray source composition; late stage in acceleration of cosmic rays; ultraheavy cosmic rays and electron capture; propagation of heavy cosmic-ray nuclei; on the abundances of ultraheavy cosmic rays; LET distributions and doses of HZe radiation components at near earth orbits; and radiation dosesmore » and LET (linear energy transfer) distributions of cosmic rays.« less
  • The objects of this study were: (1) Conduct a comprehensive literature search to determine the state-of-the-art knowledge of the effect of atmospheric radiation components on semiconductor materials from sea level to the top atmospheric layers. Emphasis shall be placed on particle propagation, radiation effects on semiconductor materials, and methods of calculating nuclear reaction cross sections. A comprehensive survey shall be made on the interactions between atmospheric components and cosmic rays and the secondary emissions and energy spectra produced. (2) Generate propagation algorithms to describe the penetration of primary cosmic rays into the atmosphere and the production of secondary emissions. (3)more » Calculate the energy loss rates in semiconductor materials for various cosmic ray components as a function of altitude, geomagnetic location, and zenith and azimuthal angles.« less
  • Fusion research has led to significant contributions in many different areas of industry, defense, and basic science. This diversity is represented visually in the introductory figure which shows both a radio galaxy, and a microchip produced by plasma etching. Some of these spin-off technologies are discussed.