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Title: The DIORAMA Neutron Emitter

Abstract

Emission of neutrons in a given event is modeled by the DioramaEmitterNeutron object, a subclass of the abstract DioramaEmitterModule object. The GenerateEmission method of this object is the entry point for generation of a neutron population for a given event. Shown in table 1, this method requires a number of parameters to be defined in the event definition.

Authors:
 [1]
  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.:
USDOE
OSTI Identifier:
1253506
Report Number(s):
LA-UR-16-23157
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE

Citation Formats

Terry, James Russell. The DIORAMA Neutron Emitter. United States: N. p., 2016. Web. doi:10.2172/1253506.
Terry, James Russell. The DIORAMA Neutron Emitter. United States. doi:10.2172/1253506.
Terry, James Russell. 2016. "The DIORAMA Neutron Emitter". United States. doi:10.2172/1253506. https://www.osti.gov/servlets/purl/1253506.
@article{osti_1253506,
title = {The DIORAMA Neutron Emitter},
author = {Terry, James Russell},
abstractNote = {Emission of neutrons in a given event is modeled by the DioramaEmitterNeutron object, a subclass of the abstract DioramaEmitterModule object. The GenerateEmission method of this object is the entry point for generation of a neutron population for a given event. Shown in table 1, this method requires a number of parameters to be defined in the event definition.},
doi = {10.2172/1253506},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2016,
month = 5
}

Technical Report:

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  • The Distributed Infrastructure Offering Real-Time Access to Modeling and Analysis (DIORAMA) software provides performance modeling capabilities of the United States Nuclear Detonation Detection System (USNDS) with a focus on the characterization of Space-Based Nuclear Detonation Detection (SNDD) instrument performance [1]. A case study was done to add the neutron propagation capabilities of DIORAMA to low earth orbit (LEO), and compare the back-calculated incident energy from the time-of- ight (TOF) spectrum with the scored incident energy spectrum. As the scoring altitude lowers, the time increase due to scattering takes up much more of the fraction of total TOF; whereas at geosynchronousmore » earth orbit (GEO), the time increase due to scattering is a negligible fraction of the total TOF [2]. The scattering smears out the TOF enough to make the back-calculation of the initial energy spectrum from the TOF spectrum very convoluted.« less
  • When simulating near-surface nuclear detonations, the terrain of the Earth can have an effect on the observed outputs. The critical parameter is called the “height of burst”. In order to model the effect of terrain on the simulations we have incorporated data from multiple sources to give 9 km resolution data with global coverage.
  • The DIORAMA code requires the solar position relative to earth in order to compute GPS satellite orientation. The present document describes two functions that compute the unit vector from either the center of the Earth to the Sun or from any observer’s position to the Sun at some specified time. Another function determines if a satellite lies within the Earth’s shadow umbra. Similarly, functions determine the position of the moon and whether a satellite lies within the Moon’s shadow umbra.
  • This document will describe the process for building the Distributed Infrastructure Offering Real- Time Access to Modeling and Analysis (DIORAMA) software from source. There are many packages included in DIORAMA depending on phenomenology and sensor suite. Each developed package depends on several other packages. The dependency graph in figure 1 shows the complicated dependencies of each package. Because of these dependencies the packages must be built in the order outlined in this guide.