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3 Journal of Technical Physics

3 2009

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Temperatures of Titan and Mars-like plasmas measured by laser interferometry

Menecier S., Legros L., Vacher D., Cerqueira N., Andre P.

Journal of Technical Physics

2009

Vol. 50, no 3

199-212

This paper presents measurements of temperature profiles of Mars and Titan-like plasmas created with an Inductively Coupled Plasma torch, using a Mach-Zehnder interferometer. Acquired interfero-grams were treated using Fast Fourier Transform and Abel inversion to obtain the radial distribution of the plasma index refraction. Temperature profiles were then obtained from the Gladstone-Dale relation, taking in account the plasma composition versus temperature.

Radiation from an ICP plasma torch in the near-UV to near-IR spectral region for a Titan-type N2-CH4 mixture

Vacher D., Dudeck M., Andre P., Lino Da Silva M., Faure G., Dubois M., Hamwi A., Menecier S., Rochette D.

Journal of Technical Physics

2009

Vol. 50, no 3

213-231

An inductively coupled plasma torch, working at atmospheric pressure, is used to create N2-CH4 Titan-like plasma (98% N2 - 2% CH4) appearing around a spacecraft. The operating frequency and power are 64 MHz and 3 kW respectively. This kind of apparatus allows to obtain plasma in chemical and quasi-thermal equilibrium. The spectral measurements covering the [320-840] nm range are performed inside the induction coil. Each interesting spectrum is calibrated and compared to the line-by-line spectral code SPARTAN used for the simulation of the radiative emission of entry-type plasma, and to the synthesized spectra realized at the LAEPT . Finally, the nucleation phenomenon that occurred in the ICP torch with the N2-CH4 plasma commented. Preliminary studies show the synthesis of nanostructured carbon on the quartz tube.

Experimental assessment of local thermodynamic equilibrium in VKI Plasmatron air plasma jet

Lequang D., Babou Y., Andre P.

Journal of Technical Physics

2009

Vol. 50, no 3

151-162

The thermodynamic state of subsonic air plasma jet, produced by VKI Plasmatron operating at 500 kW and 16 g.s-¹, in the pressure range 100-300 mbar, is investigated by means of optical emission spectroscopy diagnostics. The N and O atomic lines were recorded, in the visible spectral range at resolution of 0.066 nm, at 16 cm away from the outlet into the test chamber. The temperatures obtained assuming Local Thermodynamic Equilibrium (LTE) and only thermal equilibrium were found to agree quite well, indicating that the plasma is close to thermal equilibrium at temperature of about 10000 K. However electron densities, determined starting from Hβ line broadening measured on initial air mixture seeded with a small amount of water, were found to be about 1021 m-³, slightly lower than the densities calculated at LTE, similarly to plasma undergoing recombination.