2006
DOI: 10.1088/0953-4075/39/24/009
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Spectroscopic study of anomalous electric fields in peripheral regions of a current sheet plasma

Abstract: We observed an unusual/anomalous asymmetry of the HeI 667.8 nm spectral line profiles emitted from the peripheral regions of a current sheet plasma, which is characterized by high electron density gradients. This asymmetry can be explained only by assuming that, in the plane perpendicular to the current in the sheet, there is a strong low-frequency oscillatory electric field, which considerably exceeds the ion electric microfield. Our calculations show that this field seems to correspond to either a circularly… Show more

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Cited by 24 publications
(17 citation statements)
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“…This method called the method of the energy matrix diagonalization of an atom in an electric field is free from limitations of perturbation theory and is applicable in a wide range of the electric field parameters. The obtained theoretical results have allowed us to interpret correctly the experimental data obtained in [7] and to reveal a number of general regularities in the behaviour of the energy spectrum and transition probabilities in the helium emission spectrum in alternating electric fields arising in plasma of current sheets in laboratory conditions.…”
Section: Introductionmentioning
confidence: 54%
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“…This method called the method of the energy matrix diagonalization of an atom in an electric field is free from limitations of perturbation theory and is applicable in a wide range of the electric field parameters. The obtained theoretical results have allowed us to interpret correctly the experimental data obtained in [7] and to reveal a number of general regularities in the behaviour of the energy spectrum and transition probabilities in the helium emission spectrum in alternating electric fields arising in plasma of current sheets in laboratory conditions.…”
Section: Introductionmentioning
confidence: 54%
“…To verify the correctness of our approach in the case of calculating atomic emission spectra in plasma of current sheets, we compared results computed for the 3 1 D 2 -2 1 P 1 spectral line in the helium spectrum by the method of the energy matrix diagonalization of an atom in the electric field with experimental data and theoretical estimations of [7]. Excellent agreement of our calculated results for this spectral line reported in [10] with the results of [7] has indicated the efficiency and reliability of our theoretical approach.…”
Section: Resultsmentioning
confidence: 99%
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“…As an example, Fig. 4 shows the experimental spectrum of Al XIII Ly line in shots 82 (4 µm Al foil coated by 0.45 µm CH), which was obtained in a single laser shot with duration of 0.9 ps and the laser intensity at the surface of the target theoretically estimated as 6.7x10 20 . Also shown is a theoretical profile at N e = 2.35x10 22 cm −3 allowing, in particular, for L-dips and for a lowfrequency electrostatic turbulence.…”
Section: Analysis Of the Experimental Spectra And Comparison With Simmentioning
confidence: 99%
“…Different types of discharges were used over these experiments [10][11][12][13][14][15][16][17][18]. The LET was also diagnosed in solar flares by a detailed analysis of the shapes of the observed spectral lines of neutral hydrogen [19], as well as in experiment [20] for laboratory modeling of mechanisms of solar flares.…”
Section: Introductionmentioning
confidence: 99%