Abstract
One of the difficulties encountered in the study of dusty plasmas is related to the knowledge of the size of the dust particles present. A variety of sources, physical and chemical mechanisms of formation, causes a wide variety of sizes and morphologies of dust. The diameter of a dust will not be unique but spread over several orders of magnitude. Its distribution in number, surface, mass or volume is called distribution. It is important to know this distribution in particle size because it strongly impacts the physical and radiative processes. To have a dust distribution in situ is very difficult; the reverse method can identify the particle populations from light extinction measures. In this study, we present an inversion procedure with a Tikhonov regularization dedicated to the determination of volume size distribution (V-PSD) from extinction measurements corresponding to the different wavelengths obtained by the Extinction Spectrometry technique.
Highlights
Dusty plasmas are the objects of intense research since the beginning of the years 1980
We present an inversion procedure with a Tikhonov regularization dedicated to the determination of volume size distribution (V-particle size distributions (PSD)) from extinction measurements corresponding to the different wavelengths obtained by the Extinction Spectrometry technique
To perform Light Extinction Spectroscopy (LES) measurements, the following experimental protocol has been used: 1) ∆t = 0 s, the LES lamp is ignited during ∆t = 120 s to stabilize its intensity, 2) ∆t = 120 s, a plasma made of pure argon is ignited during ∆t = 120 s, 3) ∆t = 240 s, acetylene is introduced during (a) ∆t = 1200 s to perform a study of the spatial reparation of dust within the plasma reactor or during (b) ∆t = 3600 s to study the role of several plasma parameters on the formation of dusts, 4) ∆t = 1440 s, acetylene injection is stopped, but the plasma of argon is still ignited, 5) ∆t = 1470 s, the plasma of argon is off
Summary
Dusty plasmas are the objects of intense research since the beginning of the years 1980. The researches undertaken in the context of the thermonuclear fusion controlled by magnetic containments reveal that important quantities of dust are produced within the plasma reactors. The formation of these dust results from the erosion of the plasma reactor walls by physical sputtering [4], by chemical erosion or by melting/sublimation consecutive to an abnormal event. These dusts can pollute the confined plasma and play a critical role in the effectiveness of the plasma discharge by causing significant losses by radiation. These dusts can be a health problem especially when they contain tritium [5] [6] [7]
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