Adjoint transport methods for radiation-effects testing
- Sandia National Laboratories, Albuquerque, NM (USA)
Adjoint transport has been exploited for some time for neutral particle calculations. For charged particles, however, production adjoint capability was not available until Morel developed the ability to solve coupled-photon-electron transport problems with production discrete ordinates codes. This represents a significant advance for many problems of interest, such as predicting bremsstrahlung yield from flash X-ray machines, internal electromagnetic pulse (IEMP) for photons incident on printed circuit boards, shielding requirements for electron dosimetry, and dose enhancement from photon irradiation of printed circuit boards. The authors demonstrate here that adjoint photon-electron transport is at least an order of magnitude more efficient than forward transport for optimizing bremsstrahlung yield from flash X-ray machine converters. This problem is particularly interesting since adjoint transport provides a good approximation for a variable geometry in addition to a variable source, due to the highly forward-peaked nature of the electron scattering. Normally, neither forward nor adjoint transport is efficient for studying a variable-geometry problem.
- OSTI ID:
- 5365600
- Report Number(s):
- CONF-891103--
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Journal Name: Transactions of the American Nuclear Society; (United States) Vol. 60; ISSN TANSA; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ADJOINT DIFFERENCE METHOD
BREMSSTRAHLUNG
CALCULATION METHODS
CHARGED-PARTICLE TRANSPORT
DOSIMETRY
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELECTRON DOSIMETRY
ELECTRONIC CIRCUITS
ELECTRONS
ELEMENTARY PARTICLES
FERMIONS
IRRADIATION
LEPTONS
NEUTRAL-PARTICLE TRANSPORT
PHOTON TRANSPORT
PHYSICAL RADIATION EFFECTS
PRINTED CIRCUITS
RADIATION EFFECTS
RADIATION TRANSPORT
RADIATIONS