Spectral Line Broadening by Plasmas

Griem, Hans R.; Barr, W.L.

doi:10.1109/tps.1975.4316912

Cited by 146 publications

(309 citation statements)

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“…The latter is significantly less sensitive to the Stark effect than the H b line. 9,10 The results of this analysis (see Fig. 11) show no difference in the temperatures of plasma particles, T H % T CII ¼ 4 6 1 eV, for both B ¼ 0 and B % 860 G. The same temperature values were obtained for other distances (up to 5 mm) from the cathode.…”

Section: B Spectroscopic Studies Of the Cathode Plasmasupporting

confidence: 59%

“…In these calculations, the effects of electron impact and ion dynamics were neglected, which can be considered reasonable assumptions for plasma whose density and temperature are <10 15 cm À3 and T < 5 eV, respectively. 9 Using the analysis method presented in Ref. 10, the plasma electron density was determined at s d % 350 ns, i.e., in the middle of the accelerating pulse, when the intensity of the H b spectral line was maximal, resulting in a small error in the fitting process.…”

Section: B Spectroscopic Studies Of the Cathode Plasmamentioning

confidence: 99%

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High-current long-duration uniform electron beam generation in a diode with multicapillary carbon-epoxy cathode

Queller

Gleizer

Krasik

2013

Journal of Applied Physics

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The results of reproducibly generating an electron beam with a current density of up to 5 kA/cm 2 , without the cathode-anode gap being shorted by the plasma formed inside the cathode carbon-epoxy capillaries, in a $350 kV, $600 ns diode, with and without an external guiding magnetic field, are presented. The cathode sustained hundreds of pulses without degradation of its emission properties. Time-and space-resolved emissions of the plasma and spectroscopy analyses were used to determine the cathode plasma's density, temperature, and expansion velocity. V

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Section: B Spectroscopic Studies Of the Cathode Plasmasupporting

confidence: 59%

Section: B Spectroscopic Studies Of the Cathode Plasmamentioning

confidence: 99%

High-current long-duration uniform electron beam generation in a diode with multicapillary carbon-epoxy cathode

Queller

Gleizer

Krasik

2013

Journal of Applied Physics

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“…where E Ar + = 15.755 eV and E Ar ++ = 27.76 eV are the ionization energies of Ar + and Ar ++ , respectively. The lowering E ion of these energies can be calculated from the model of Coulomb interaction developed by Griem [39]:…”

Section: Dalton's Law P K B Tmentioning

confidence: 99%

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Chéron

Yan

et al. 2007

Plasma Sources Sci. Technol.

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An atmospheric argon plasma jet generated by an original dc double anode plasma torch has been investigated through its electrical and spectroscopic diagnostics. The arc instabilities and dynamic behavior of the argon plasma are analyzed using classical tools such as the statistical method, fast Fourier transform (FFT) and correlation function. The takeover mode is identified as the fluctuation characteristic of the double arc argon plasma jet in our experiment. The FFT and correlation analysis of electrical signals exhibit the only characteristic frequency of 150 Hz, which originates from the torch power and is independent of any change in the operating parameters. No high frequency fluctuations (1-15 kHz) are observed. This indicates that the nature of fluctuations in an argon plasma jet is induced mainly by the undulation of the tri-phase rectified power supply. It is found that each arc root attachment is diffused rather than located at a fixed position on the anode wall. Moreover, the emission spectroscopic technique is performed to determine the electron temperature and number density of the plasma jet inside and outside the arc chamber. Along the torch axis, the measured electron temperature and number density of the double arc argon plasma drop from 12 300 K and 7.6 × 10 22 m −3 at the divergent part of the first anode nozzle, to 10 500 K and 3.1 × 10 22 m −3 at the torch exit. In addition, the validity criteria of the local thermodynamic equilibrium (LTE) state in the plasma arc are examined. The results show that the measured electron densities are in good agreement with those calculated from the LTE model, which indicates that the double arc argon plasma at atmospheric pressure is close to the LTE state under our experimental conditions.

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“…The OES based technique is suitable for measurement of electron density and electron temperature. To measure electron temperature line intensity ratio method is used, in which the intensity ratio of emission lines is related to electron temperature and electron density [7,8,9 ].…”

Section: Introductionmentioning

confidence: 99%

Estimation of electron temperature in atmospheric pressure dielectric barrier discharge using line intensity ratio method

Shrestha

Tyata²,

Subedi

2013

Kathmandu University J of Sci, Engineering & Technol

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Dielectric Barrier Discharge was produced by applying high voltage AC source of frequency (10-30 KHz) and potential difference of (0-20) kV across two parallel plate electrodes with glass as dielectric barrier. Optical emission spectroscopy was used for the characterization of the discharge produced at atmospheric pressure. The emission spectra in the range of 200 nm to 850 nm have been analyzed to estimate the electron temperature by line intensity ratio method. The results showed that the electron temperature is about 0.9 eV. Kathmandu University Journal of Science, Engineering and Technology Vol. 8, No. II, December, 2012, 37-42 DOI: http://dx.doi.org/10.3126/kuset.v8i2.7323

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Spectral Line Broadening by Plasmas

Cited by 146 publications

References 0 publications

High-current long-duration uniform electron beam generation in a diode with multicapillary carbon-epoxy cathode

High-current long-duration uniform electron beam generation in a diode with multicapillary carbon-epoxy cathode

Electrical and spectroscopic diagnostic of an atmospheric double arc argon plasma jet

Estimation of electron temperature in atmospheric pressure dielectric barrier discharge using line intensity ratio method

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