A New Numerical Method for Asymmetrical Abel Inversion

Yasutomo, Yuichi; Miyata, K.; Himeno, Shun-ichi; Enoto, Takeaki; Ozawa, Yasutomo

doi:10.1109/tps.1981.4317374

Cited by 81 publications

(24 citation statements)

References 4 publications

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“…But the presence of the anode disc downstream of the nozzle brings about a distortion of the symmetry. This situation can be treated using the procedure developed by Yasutomo et al [17]. It is assumed that the plasma keeps a cylindrical shape and an asymmetry exists only perpendicular to the direction of observation.…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%

Spectroscopic Characterization of a Steam Arc Cutting Torch

Sember

Mašláni

Křenek

et al. 2011

Plasma Chem Plasma Process

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Optical emission spectroscopy has been used to investigate the characteristics of a plasma jet produced by a steam arc cutting torch operated in air at atmospheric pressure. A procedure has been developed for simultaneous determination of temperature and pressure in the plasma jet as well as an effective nonequilibrium factor. It is based on comparison of a few experimental and simulated spectral quantities. The experimental data were obtained from the spectrum of H b and OII lines centred at 480 nm. The existence of the shock wave structure characteristic of an underexpanded jet can clearly be deduced from the measured properties. In the first expansion region, the centreline pressure drops from about 1.4 atm at the nozzle exit to about 0.7 atm a few tenths of millimeter downstream. On the contrary, the centreline temperature remains almost unchanged within this region and reaches the value of about 23,000 K.

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Section: Spectroscopic Measurementsmentioning

confidence: 99%

Spectroscopic Characterization of a Steam Arc Cutting Torch

Sember

Mašláni

Křenek

et al. 2011

Plasma Chem Plasma Process

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“…But, we developed dedicated inversion taking into account some deviation from axial symmetry according to recent papers. 26,27 Even so, one can therefore see local spikes and artifacts from the calculation that are not related to any real feature. The This article is copyrighted as indicated in the article.…”

Section: B Influence Of Ambient Medium Pressure On the Jet Structurementioning

confidence: 99%

Formation and propagation of laser-driven plasma jets in an ambient medium studied with X-ray radiography and optical diagnostics

et al. 2015

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In this paper, we present experimental results obtained on the LULI2000 laser facility regarding structure and dynamics of astrophysical jets propagating in interstellar medium. The jets, generated by using a cone-shaped target, propagate in a nitrogen gas that mimics the interstellar medium. X-ray radiography as well as optical diagnostics were used to probe both high and low density regions. In this paper, we show how collimation of the jets evolves with the gas density.

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“…(2), the n e and n 0 profiles are deduced by acquiring the emission profiles. Because the emissions measured by the high-speed camera and the monochromators are projections, the asymmetric Abel inversion [6] and algebraic reconstruction technique (ART) [7] was performed to reconstruct the local profiles.…”

Section: Theorymentioning

confidence: 99%

Optical Measurements of High-Density Helicon Plasma by Using a High-Speed Camera and Monochromators

Waseda

Fujitsuka

Shinohara

et al. 2014

Plasma and Fusion Research

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Electric propulsion is an established high-efficiency method in deep space explorers. However, most of the applied methods feature electrodes in direct contact with the plasma, thus its lifetime is limited by the electrodes' erosion. We developed electrodeless electric propulsion systems in order to overcome this problem, and performed optical measurements to estimate the high-density helicon plasma performance of the systems. The electron and neutral particle density profiles were measured by a high-speed camera, and the velocity of the singly-charged Ar ions was determined by a high-resolution monochromator. Additionally, a preliminary experiment of a spectroscopic method using an intensity ratio based on a collisional radiative model with a CCD monochromator was performed. The plasma parameters were in good agreement with the results obtained by an electrostatic probe, and the non-invasive optical measurements presented here can constitute an effective tool for evaluating an electric propulsion system.

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A New Numerical Method for Asymmetrical Abel Inversion

Cited by 81 publications

References 4 publications

Spectroscopic Characterization of a Steam Arc Cutting Torch

Spectroscopic Characterization of a Steam Arc Cutting Torch

Formation and propagation of laser-driven plasma jets in an ambient medium studied with X-ray radiography and optical diagnostics

Optical Measurements of High-Density Helicon Plasma by Using a High-Speed Camera and Monochromators

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