NDLI: Coupled neutron transport for hzetrn

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Coupled neutron transport for hzetrn

Content Provider	NASA Technical Reports Server (NTRS)
Author	Slaba, Tony C. Blattnig, Steve R.
Copyright Year	2009
Description	Exposure estimates inside space vehicles, surface habitats, and high altitude aircrafts exposed to space radiation are highly influenced by secondary neutron production. The deterministic transport code HZETRN has been identified as a reliable and efficient tool for such studies, but improvements to the underlying transport models and numerical methods are still necessary. In this paper, the forward-backward (FB) and directionally coupled forward-backward (DC) neutron transport models are derived, numerical methods for the FB model are reviewed, and a computationally efficient numerical solution is presented for the DC model. Both models are compared to the Monte Carlo codes HETC-HEDS, FLUKA, and MCNPX, and the DC model is shown to agree closely with the Monte Carlo results. Finally, it is found in the development of either model that the decoupling of low energy neutrons from the light particle transport procedure adversely affects low energy light ion fluence spectra and exposure quantities. A first order correction is presented to resolve the problem, and it is shown to be both accurate and efficient.
File Size	321229
Page Count	31
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090037432
Archival Resource Key	ark:/13960/t6838sf5r
Language	English
Publisher Date	2009-10-01
Access Restriction	Open
Subject Keyword	Space Radiation Numerical Analysis Light Ions Decoupling Energy Spectra Neutrons Exposure Extraterrestrial Radiation Energy Transfer Monte Carlo Method Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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