The Stark-crossing method for the simultaneous determination of the electron temperature and density in plasmas

Torres, Jimena; Carabaño, O; Fernandez, Marie Claude; Rubio, Soledad; Álvarez, Rafael; Rodero, A.; Lao, Congcong; Quintero, M.C.; Gamero, A; Sola, A

doi:10.1088/1742-6596/44/1/008

Cited by 9 publications

(10 citation statements)

References 14 publications

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“…As mentioned in Section 3, the calculations were made imposing the plasma conditions (values and profiles for the electron density and temperature), which are given in the appendix. These conditions agree with our experimental observations and are also supported by other works [9,11,21]. The plasma impedance changes with n e and ν (see Equation (2)) [22], thus affecting the wave-plasma power coupling.…”

Section: Electromagnetic Modulesupporting

confidence: 92%

“…The electron temperature could not be measured due to the experimental lack of precision. We estimate T e ~ 17,000 -25,000 K, according to the work of Torres et al [21] and Jonkers et al [10].…”

Section: Optical Diagnosticsmentioning

confidence: 99%

“…R p and L p are respectively the radius and the length of the plasma. [9,21]. The studied gas is helium at atmospheric pressure.…”

Section: A1 Plasma Descriptionmentioning

confidence: 99%

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Study of Gas Heating by a Microwave Plasma Torch

Gadonna¹,

Leroy²,

Leprince³

et al. 2012

JMP

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Among the different types of microwave plasma torches, the axial injection torch (TIA) has been used for several years to create chemically active species, in applications such as gas analysis, surface processing and gaseous waste treatments. The TIA allows the coupling of microwave energy (2.45 GHz) to a gas injected axially at the nozzle's exit. The TIA produces non-local thermodynamic equilibrium plasmas with a high luminosity and a maximum density of charged particles at the nozzle's exit. The present work is dedicated to study the plasma created by a TIA running at atmospheric pressure. The study involves both experiment and modeling of this torch, in order to maximize the coupling between the microwave power and the plasma and to define the optimum plasma and flow operating conditions for plasma-to-gas heat transfer.

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Section: Electromagnetic Modulesupporting

confidence: 92%

Section: Optical Diagnosticsmentioning

confidence: 99%

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Study of Gas Heating by a Microwave Plasma Torch

Gadonna¹,

Leroy²,

Leprince³

et al. 2012

JMP

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show abstract

“…Moreover, other techniques for the electron density determination should be used to validate the obtained results, for instance, determination of the electron density from continuum radiation, or, for instance, technique proposed in [27].…”

mentioning

confidence: 99%

Detailed Investigation of the Electric Discharge Plasma between Copper Electrodes Immersed into Water

Venger

Tmenova

Valensi

et al. 2017

Atoms

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Abstract:A phenomenological picture of pulsed electrical discharge in water is produced by combining electrical, spectroscopic, and imaging methods. The discharge is generated by applying 350 µs long 100 to 220 V pulses (values of current from 400 to 1000 A, respectively) between the point-to-point copper electrodes submerged into the non-purified tap water. Plasma channel and gas bubble occur between the tips of the electrodes, which are initially in contact with each other. The study includes detailed experimental investigation of plasma parameters of such discharge using the correlation between time-resolved high-speed imaging, electrical characteristics, and optical emission spectroscopic data. Radial distributions of the electron density of plasma is estimated from the analysis of profiles and widths of registered H α and H β hydrogen lines, and Cu I 515.3 nm line, exposed to the Stark mechanism of spectral lines' broadening. Estimations of the electrodes' erosion rate and bubbles' size depending on the electrical input parameters of the circuit are presented. Experimental results of this work may be valuable for the advancement of modeling and the theoretical understanding of the pulse electric discharges in water.

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“…[3][4][5][6] We use the microfield model method, a computational simulation theory due to Gigosos et al 7 applied to the three first Balmer series lines ͑H ␣ , H ␤ , and H ␥ ͒ in a nonequilibrium ͑two-temperature͒ plasma. The broadening of different spectral lines depends differently on n e and T e .…”

Section: )mentioning

confidence: 99%

Multiple diagnostics in a high-pressure hydrogen microwave plasma torch

Torres¹,

Mullen²,

Gamero³

et al. 2010

Applied Physics Letters

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We present an experimental study of a hydrogen plasma produced by a microwave axial injection torch, launching the plasma in a helium-filled chamber. Three different diagnostic methods have been used to obtain the electron density and temperature as follows: The Stark intersection method of Balmer spectral lines (already tested in argon and helium plasmas); the modified Boltzmann-plot showing that the plasma is far from the local thermodynamic equilibrium but ruled by the excitation-saturation balance; and a study by the disturbed bilateral relations theory. All of these diagnostic techniques show a good agreement.

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The Stark-crossing method for the simultaneous determination of the electron temperature and density in plasmas

Cited by 9 publications

References 14 publications

Study of Gas Heating by a Microwave Plasma Torch

Study of Gas Heating by a Microwave Plasma Torch

Detailed Investigation of the Electric Discharge Plasma between Copper Electrodes Immersed into Water

Multiple diagnostics in a high-pressure hydrogen microwave plasma torch

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