The gravity extension for MCNP 6.2

Kyle B. Grammer

doi:10.1016/j.nima.2024.169136

The gravity extension for MCNP 6.2

Kyle B. Grammer

Neutronics Group

Research output: Contribution to journal › Article › peer-review

Abstract

Standard MCNP particle tracking takes place along straight-line trajectories from interaction point to interaction point. There is a feature within MCNP that is planned for deprecation that provides surface boundary conditions for approximating gravity for planetary cases, but this feature is not applicable to a cold neutron beam. A new extension has been developed to track particles along parabolic trajectories with a constant acceleration. MCNP contains 1st and 2nd-order surfaces as well as a special case of 4th-order surfaces for simple tori, and the intersection of parabolic trajectories with these surfaces becomes 2nd, 4th, and 8th-order equations in time, respectively. Solving these equations utilizes a fast algorithm for finding the roots of polynomials. The theory, MCNP input card, and examples of using this new feature will be discussed.

Original language	English
Article number	169136
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	1061
DOIs	https://doi.org/10.1016/j.nima.2024.169136
State	Published - Apr 2024

Funding

This material is based upon work supported by the U.S. Department of Energy , Office of Science , Office of Basic Energy Sciences under contract number DE-AC05-00OR22725 .

Keywords

MCNP
Particle tracking
Radiation shielding

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10.1016/j.nima.2024.169136

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title = "The gravity extension for MCNP 6.2",

abstract = "Standard MCNP particle tracking takes place along straight-line trajectories from interaction point to interaction point. There is a feature within MCNP that is planned for deprecation that provides surface boundary conditions for approximating gravity for planetary cases, but this feature is not applicable to a cold neutron beam. A new extension has been developed to track particles along parabolic trajectories with a constant acceleration. MCNP contains 1st and 2nd-order surfaces as well as a special case of 4th-order surfaces for simple tori, and the intersection of parabolic trajectories with these surfaces becomes 2nd, 4th, and 8th-order equations in time, respectively. Solving these equations utilizes a fast algorithm for finding the roots of polynomials. The theory, MCNP input card, and examples of using this new feature will be discussed.",

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AB - Standard MCNP particle tracking takes place along straight-line trajectories from interaction point to interaction point. There is a feature within MCNP that is planned for deprecation that provides surface boundary conditions for approximating gravity for planetary cases, but this feature is not applicable to a cold neutron beam. A new extension has been developed to track particles along parabolic trajectories with a constant acceleration. MCNP contains 1st and 2nd-order surfaces as well as a special case of 4th-order surfaces for simple tori, and the intersection of parabolic trajectories with these surfaces becomes 2nd, 4th, and 8th-order equations in time, respectively. Solving these equations utilizes a fast algorithm for finding the roots of polynomials. The theory, MCNP input card, and examples of using this new feature will be discussed.

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KW - Radiation shielding

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ER -

The gravity extension for MCNP 6.2

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