On limitations of laser-induced fluorescence diagnostics for xenon ion velocity distribution function measurements in Hall thrusters

2018 ◽  
Vol 25 (3) ◽  
pp. 033501 ◽  
Author(s):  
I. Romadanov ◽  
Y. Raitses ◽  
A. Diallo ◽  
K. Hara ◽  
I. D. Kaganovich ◽  
...  
Keyword(s):  
Distribution Function ◽  
Velocity Distribution ◽  
Velocity Distribution Function ◽  
Laser Induced Fluorescence ◽  
Hall Thrusters ◽  
Fluorescence Diagnostics ◽  
Ion Velocity ◽  
Ion Velocity Distribution Function

scholarly journals Bayesian inference of ion velocity distribution function from laser-induced fluorescence spectra

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Tokuda ◽  
Y. Kawachi ◽  
M. Sasaki ◽  
H. Arakawa ◽  
K. Yamasaki ◽  
...  
Keyword(s):  
Distribution Function ◽  
Bayesian Inference ◽  
Velocity Distribution ◽  
Velocity Distribution Function ◽  
Analytic Form ◽  
Laser Induced Fluorescence ◽  
Magnetized Plasma ◽  
Local Velocity ◽  
Ion Velocity ◽  
Ion Velocity Distribution Function

AbstractThe 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.

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