16-19 October 2016
Copenhagen University
Europe/Copenhagen timezone

Simulating ideal mosaic and/or deformed single-crystal in arbitrary geometry in Geant4

17 Oct 2016, 17:00
1h 30m
Marble Hall (Copenhagen University)

Marble Hall

Copenhagen University

Thorvaldsensvej 40
Board: 27
Poster Posters


Dr. Xiao Xiao Cai (ESS/DTU)


NCrystal is a Monte Carlo software package that we developed for slow neutron interactions with single- and poly-crystals. Together with the inelastic scattering models in NCrystal, the Bragg diffraction model provides detailed microscopic description of the neutron transport in crystals. We only show the single-crystal capabilities in our newly developed NCrystal Geant4 extension in this presentation. Bragg diffraction in crystals directly demonstrates the wave property of neutron. The physics of such processes in single-crystal can be described by the Darwin equations. So far, the exact solution of equations is only known in the case for a slab-like geometry. Taking advance of the powerful geometrical navigation capabilities of the open-source simulation toolkit Geant4, our detailed Bragg diffraction model can simulate neutron transport accurately in almost any geometry. We will compare our simulated results in a few cases with well established analytical models.

Primary author

Dr. Xiao Xiao Cai (ESS/DTU)


Dr. Thomas Kittelmann (European Spallation Source ERIC)

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