Bayesian inference of ion velocity distribution function from laser-induced fluorescence spectra
| Autor: | Shigeru Inagaki, Hiroyuki Arakawa, Makoto Sasaki, Kenichiro Terasaka, Satoru Tokuda, Yuichi Kawachi, Kotaro Yamasaki |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Science
FOS: Physical sciences Bayesian inference Measure (mathematics) Magnetically confined plasmas Article Ion Statistical physics Spectroscopy Condensed Matter - Statistical Mechanics Physics Multidisciplinary Statistical Mechanics (cond-mat.stat-mech) Statistics Plasma Function (mathematics) Physics - Plasma Physics Bayesian statistics Plasma Physics (physics.plasm-ph) Distribution function Physics - Data Analysis Statistics and Probability Medicine Data Analysis Statistics and Probability (physics.data-an) |
| Zdroj: | Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | The velocity distribution function is a statistical description that connects particle kinetics and macroscopic parameters in many-body systems. Laser-induced fluorescence (LIF) spectroscopy is utilized to measure the local velocity distribution function in spatially inhomogeneous plasmas. However, the analytic form of such a function for the system of interest is not always clear under the intricate factors in non-equilibrium states. Here, we propose a novel approach to select the valid form of the velocity distribution function based on Bayesian statistics. We formulate the Bayesian inference of ion velocity distribution function and apply it to LIF spectra locally observed at several positions in a linear magnetized plasma. We demonstrate evaluating the spatial inhomogeneity by verifying each analytic form of the local velocity distribution function. Our approach is widely applicable to experimentally establish the velocity distribution function in plasmas and fluids, including gases and liquids. |
| Databáze: | OpenAIRE |
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