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Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
Zap Energy hits 37-million-degree electron temperatures in compact fusion device
Zap Energy announced April 23 that it has reached 1-3 keV plasma electron temperatures—roughly the equivalent of 11 to 37 million degrees Celsius—using its sheared-flow-stabilized Z-pinch approach to fusion. Reaching temperatures above that of the sun’s core (which is 10 million degrees Celsius temperature) is just one hurdle required before any fusion confinement concept can realistically pursue net gain and fusion energy.
B. R. Wienke, R. E. Hiromoto
Nuclear Science and Engineering | Volume 90 | Number 1 | May 1985 | Pages 116-123
Technical Note | doi.org/10.13182/NSE85-1
Articles are hosted by Taylor and Francis Online.
The iterative, multigroup, discrete ordinates Sn representation for the linear transport equation enjoys widespread computational use and popularity. Serial iteration schemes and numerical algorithms developed over the years provide a timely framework for parallel extension. On the Denelcor heterogeneous element processor, three parallel iteration schemes (two chaotic, one ordered) are investigated for solving the one-dimensional Sn transport equation. Concurrent inner sweeps, coupled acceleration techniques, synchronized inner-outer loops, and chaotic iteration are described and results of computations are contrasted. The multigroup representation and serial iteration methods are also reviewed. The basic iterative Sn approach lends itself to parallel tasking, portably affording an effective medium for performing transport calculations on future architectures. This analysis represents a first attempt to extend serial Sn algorithms to parallel environments and provides good baseline estimates on ease of parallel implementation, relative algorithm efficiency, comparative speedup, and some future directions. An ordered and chaotic strategy is examined, with and without concurrent rebalance and diffusion acceleration, which efficiently support high degrees of parallelization and appear to be robust and viable parallel iteration techniques. The standard inner-outer technique, presently employed in a majority of production Sn codes, is a weaker parallel iteration strategy. Modifications, extensions, and recoding effort to parallelize existing serial algorithms are also simple. Chaotic iteration, heretofore difficult to simulate on serial machines, holds promise and appears to converge faster than ordered schemes. Actual parallel speedup and efficiency are high and payoff appears substantial.