The SCEPTRE Radiation Transport Code Project
Abstract not provided.
Publications
Least Squares Finite Elements Algorithms in the SCEPTRE Radiation Transport Code
Abstract not provided.
Radiation transport code projects : SCEPTRE and ITS version 6
Abstract not provided.
Least squares finite elements algorithms in the sceptre radiation transport code
Abstract not provided.
Parallel Discrete Ordinates Methods in the SCEPTRE Project
Abstract not provided.
Recent Enhancements in Cable SGEMP Modeling and Simulation
Abstract not provided.
Update on cable SGEMP analysis
Abstract not provided.
The radlib code architecture for the SCEPTRE project
Abstract not provided.
Uncertainty analysis for electrical cables in radiation environments
Abstract not provided.
Parallel Discrete Ordinates Methods in the CEPTRE Project
Abstract not provided.
An analysis of the extended-transport correction with application to electron-beam transport
Proposed for publication in Nuclear Science and Engineering.
Abstract not provided.
Radiation predictions and shielding calculations for RITS-6
The mission of Radiographic Integrated Test Stand-6 (RITS-6) facility is to provide the underlying science and technology for pulsed-power-driven flash radiographic X-ray sources for the National Nuclear Security Administration (NNSA). Flash X-ray radiography is a penetrating diagnostic to discern the internal structure in dynamic experiments. Short (~50 nanosecond (ns) duration) bursts of very high intensity Xrays from mm-scale source sizes are required at a variety of voltages to address this mission. RITS-6 was designed and is used to both develop the accelerator technology needed for these experiments and serves as the principal test stand to develop the high intensity electron beam diodes that generate the required X-ray sources. RITS is currently in operation with three induction cavities (RITS-3) with a maximum voltage output of 5.5 MV and is classified as a low hazard non-nuclear facility in accordance with CPR 400.1.1, Chapter 13, Hazards Identification/Analysis and Risk Management. The facility will be expanded from three to six cavities (RITS-6) effectively doubling the operating voltage. The increase in the operating voltage to above 10 MV has resulted in RITS-6 being classified as an accelerator facility. RITS-6 will come under DOE Order 420.2B, Safety of Accelerator Facilities. The hazards of RITS are detailed in the "Safety Assessment Document for the Radiographic Integrated Test Stand Facility." The principal non-industrial hazard is prompt x-ray radiation. As the operating voltage is increased, both the penetration power and the total amount (dose) of x-rays are increased, thereby increasing the risk to local personnel. Fixed site shielding (predominantly concrete walls and a steel/lead skyshine shield) is used to attenuate these x-rays and mitigate this risk. This SAND Report details the anticipated x-ray doses, the shielding design, and the anticipated x-ray doses external to this shielding structure both in areas where administrative access control restricts occupation and in adjacent uncontrolled areas.
Delta-function down scatter and extended first collision source for electron beam transport
Abstract not provided.
Coupled Electron-Photon Transport with the Ceptre Code
Abstract not provided.
Application of the Ceptre Code to Cable SGEMP Problems
Abstract not provided.
Application of the CEPTRE Code to Cable SGEMP Problems
Abstract not provided.
Overview of CEPTRE and applications to cable SGEMP simulations (U)
Abstract not provided.
Overview of CEPTRE and applications to cable SGEMP simulations
Abstract not provided.
ITS version 5.0 : the integrated TIGER series of coupled electron/photon Monte Carlo transport codes
ITS is a powerful and user-friendly software package permitting state of the art Monte Carlo solution of linear time-independent couple electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Our goal has been to simultaneously maximize operational simplicity and physical accuracy. Through a set of preprocessor directives, the user selects one of the many ITS codes. The ease with which the makefile system is applied combines with an input scheme based on order-independent descriptive keywords that makes maximum use of defaults and internal error checking to provide experimentalists and theorists alike with a method for the routine but rigorous solution of sophisticated radiation transport problems. Physical rigor is provided by employing accurate cross sections, sampling distributions, and physical models for describing the production and transport of the electron/photon cascade from 1.0 GeV down to 1.0 keV. The availability of source code permits the more sophisticated user to tailor the codes to specific applications and to extend the capabilities of the codes to more complex applications. Version 5.0, the latest version of ITS, contains (1) improvements to the ITS 3.0 continuous-energy codes, (2)multigroup codes with adjoint transport capabilities, and (3) parallel implementations of all ITS codes. Moreover the general user friendliness of the software has been enhanced through increased internal error checking and improved code portability.
Discrete Ordinates Approximations to the First- and Second-Order Radiation Transport Equations
The conventional discrete ordinates approximation to the Boltzmann transport equation can be described in a matrix form. Specifically, the within-group scattering integral can be represented by three components: a moment-to-discrete matrix, a scattering cross-section matrix and a discrete-to-moment matrix. Using and extending these entities, we derive and summarize the matrix representations of the second-order transport equations.
Experience with Unstructured-Mesh Electron Transport with Massively Parallel Computing
Abstract not provided.
Results 26–46 of 46