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Volume 12
Issue 1
10.3390/psf2025012018
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Proceeding Paper

Determination of Uncertainty Model of a Particle-Reflection-Distribution †

by
Roland Preuss
* and
Udo von Toussaint
Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
*
Author to whom correspondence should be addressed.
†
Presented at the 43rd International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering, Ghent, Belgium, 1–5 July 2024.
Phys. Sci. Forum 2025, 12(1), 18; https://doi.org/10.3390/psf2025012018
Published: 24 November 2025
(This article belongs to the Proceedings of The 43rd International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering)
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Abstract

The modelling of plasma–wall interactions (PWIs) depends on distributions describing the angle and energy distribution of particles scattered at the first wall of fusion devices. Most PWI codes rely on extensive tables based on data from reflection simulations, employing a Monte Carlo method. At first glance, the uncertainty distribution of the data should be assumed Gaussian. However, in order to obtain the resulting particle distribution, the reflected ions are counted within angle sections of the upper hemisphere, which hints to a Poisson uncertainty distribution. In this paper, we let Bayesian model comparison decide which uncertainty model should be taken.
Keywords: model comparison; particle reflection distribution; rough surfaces; ion scattering model comparison; particle reflection distribution; rough surfaces; ion scattering

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MDPI and ACS Style

Preuss, R.; von Toussaint, U. Determination of Uncertainty Model of a Particle-Reflection-Distribution. Phys. Sci. Forum 2025, 12, 18. https://doi.org/10.3390/psf2025012018

AMA Style

Preuss R, von Toussaint U. Determination of Uncertainty Model of a Particle-Reflection-Distribution. Physical Sciences Forum. 2025; 12(1):18. https://doi.org/10.3390/psf2025012018

Chicago/Turabian Style

Preuss, Roland, and Udo von Toussaint. 2025. "Determination of Uncertainty Model of a Particle-Reflection-Distribution" Physical Sciences Forum 12, no. 1: 18. https://doi.org/10.3390/psf2025012018

APA Style

Preuss, R., & von Toussaint, U. (2025). Determination of Uncertainty Model of a Particle-Reflection-Distribution. Physical Sciences Forum, 12(1), 18. https://doi.org/10.3390/psf2025012018

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