Modelling an Ar-Hg fluorescent lamp plasma using a 3 electron-temperature approximation

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Section: Axial Trends: Correlation With the Ionization Degree Along Tmentioning

confidence: 99%

Experimental investigation of the electron energy distribution function (EEDF) by Thomson scattering and optical emission spectroscopy

Carbone¹,

Hübner²,

Jimenez-Diaz³

et al. 2012

“…This may result in a depletion of the high energy part (tail) of the EEDF. As discussed in [31,32], the EEDF can be divided into two parts: a bulk and a tail. The boundary between the parts is equal to the first inelastic excitation threshold, i.e.…”

Section: Ali Measurementsmentioning

confidence: 99%

Polydiagnostic calibration performed on a low pressure surface wave sustained argon plasma

Vries¹,

Palomares²,

Iordanova³

et al. 2008

The electron density and electron temperature of a low pressure surface wave sustained argon plasma have been determined using passive and active (laser) spectroscopic methods simultaneously. In this way the validity of the various techniques is established while the plasma properties are determined more precisely. The electron density, ne, is determined with Thomson scattering (TS), absolute continuum measurements, Stark broadening and an extrapolation of the atomic state distribution function (ASDF). The electron temperature, Te, is obtained using TS and absolute line intensity (ALI) measurements combined with a collisional–radiative (CR) model for argon. At an argon pressure of 15 mbar, the ne values obtained with TS and Stark broadening agree with each other within the error bars and are equal to (4 ± 0.5) × 1019 m−3, whereas the ne value (2 ± 0.5) × 1019 m−3 obtained from the continuum is about 30% lower. This suggests that the used formula and cross-section values for the continuum method have to be reconsidered. The electron density determined by means of extrapolation of the ASDF to the continuum is too high (∼1020 m−3). This is most probably related to the fact that the plasma is strongly ionizing so that the extrapolation method is not justified. At 15 mbar, the Te values obtained with TS are equal to 13 400 ± 1100 K while the ALI/CR-model yields an electron temperature that is about 10% lower. It can be concluded that the passive results are in good or fair agreement with the active results. Therefore, the calibrated passive methods can be applied to other plasmas in a similar regime for which active diagnostic techniques cannot be used.

“…In the last years, the modelling of argon plasmas has attracted renewed interest, probably due to the large number of applications involving these systems (see, e.g. Hartgers and van der Mullen (2001), Tao et al (2002), or Giugliani et al (2003)). Unfortunately, the reappearance of this research topic has not always been accompanied by an update of the various physical quantities associated with this kind of study.…”

Section: Introductionmentioning

confidence: 99%

An update of argon inelastic cross sections for plasma discharges

Yanguas‐Gil

Cotrino

Alves³

2005

138

This paper proposes a coherent set of electron impact inelastic cross sections for argon, based on recent experimental measurements. The updated set is validated by comparing calculated swarm parameters and rate coefficients (obtained by solving the two-term approximation electron Boltzmann equation) with available experimental data. This validation procedure is usually adopted when the cross section set is to be later used in plasma discharge modelling. Simulation results for the electron drift velocity and characteristic energy are in very good agreement with experimental values of these quantities. Calculations, using cross section sets proposed by different authors, of the total (direct + cascade) excitation coefficients to the 4s and 4p states, and of the Townsend ionization coefficient, show that the present set ensures the best overall agreement with measured values. The agreement is particularly good for the excitation coefficient to metastable 4s′[1/2]0 and the Townsend ionization coefficient, which are probably the most relevant electron macroscopic coefficients in the modelling of discharge plasmas.