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An improved neutron transport algorithm for hzetrn
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Walker, Steven A. Clowdsley, Martha S. Slaba, Tony C. Blattnig, Steve R. Badavi, Francis F. |
| Copyright Year | 2010 |
| Description | Long term human presence in space requires the inclusion of radiation constraints in mission planning and the design of shielding materials, structures, and vehicles. In this paper, the numerical error associated with energy discretization in HZETRN is addressed. An inadequate numerical integration scheme in the transport algorithm is shown to produce large errors in the low energy portion of the neutron and light ion fluence spectra. It is further shown that the errors result from the narrow energy domain of the neutron elastic cross section spectral distributions, and that an extremely fine energy grid is required to resolve the problem under the current formulation. Two numerical methods are developed to provide adequate resolution in the energy domain and more accurately resolve the neutron elastic interactions. Convergence testing is completed by running the code for various environments and shielding materials with various energy grids to ensure stability of the newly implemented method. |
| File Size | 1533855 |
| Page Count | 34 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20100009533 |
| Archival Resource Key | ark:/13960/t91888w86 |
| Language | English |
| Publisher Date | 2010-02-01 |
| Access Restriction | Open |
| Subject Keyword | Space Radiation Measure and Integration Numerical Analysis Light Ions Numerical Integration Fluence Neutrons Mission Planning Shielding Neutron Cross Sections 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 |
