Single-shot analysis of micropinches in a vacuum spark discharge

Schulz, A.; Burhenn, R.; Rosmej, F. B.; Kunze, H.

doi:10.1088/0022-3727/22/5/013

Cited by 11 publications

(5 citation statements)

References 18 publications

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“…The electron temperature T, (H) for iron turns out to be T,(H) -4.5 keV (Kononov 19779, much larger than the value TJ H) I! However, when comparing different single shots it turns out that In/lue varies much more from discharge to discharge than other intensity ratios used for diagnostics (Schultz 1989). The relative intensities of the resonance transitions for H-and He-like ions, In/l,, also gives an ionization temperature for the ioniza-tion equilibrium between these two ionization states, T,(He/H).…”

Section: B Plasma Point Temperaturementioning

confidence: 99%

“…However, plasma points do not develop Single-shot spectra must be studied with a highly sensitive spectrometer (e.g., -Schultz 1989;Aglitskii 1984).~ The measurement technique (Antsiferov 1989) uses a curved quartz crystal spectrograph with different crystals (2d = 2.26, 4.91, and 6.68 A> and radii of curvature .:-. However, plasma points do not develop Single-shot spectra must be studied with a highly sensitive spectrometer (e.g., -Schultz 1989;Aglitskii 1984).~ The measurement technique (Antsiferov 1989) uses a curved quartz crystal spectrograph with different crystals (2d = 2.26, 4.91, and 6.68 A> and radii of curvature .:-.…”

Section: Two Regimes Of Micropinchingmentioning

confidence: 99%

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Plasma points and radiative collapse in vacuum sparks

Koshelev

Pereira²

1991

Journal of Applied Physics

142

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This review discusses the intense x-ray emitting regions, called plasma points, that appear in low-inductance vacuum sparks and other high-current discharges. Accurate x-ray spectroscopy indicates the existence of two types of plasma points with different plasma parameters. One type is extremely small ( -microns), dense ( -1023/cm3), and hot ( 2 1 keV), while the second type is an order of magnitude less extreme. A dynamic model (Vikhrev 1982a) based on radiation cooling with axial outflow of plasma predicts a radiative collapse that is consistent with many features of the plasma points. R21

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Section: B Plasma Point Temperaturementioning

confidence: 99%

Section: Two Regimes Of Micropinchingmentioning

confidence: 99%

Plasma points and radiative collapse in vacuum sparks

Koshelev

Pereira²

1991

Journal of Applied Physics

142

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“…First of all, such discharge facilities can be used to produce a hot dense plasma for the problems of inertial thermonuclear fusion [1,2]. In addition, a local high-temperature plasma area ('a hot point') produced in discharge plasmas due to pinching is an efficient broadband x-ray source [3][4][5]. Such discharges seem quite promising as soft x-ray (SXR) sources in the wavelength range above 20 Å for solving a variety of scientific and technological problems, in particular, in x-ray radiography and thermonuclear fusion investigations [6], for studying the internal structure of biological objects, astrophysical applications, etc [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

Romanov

Tsygvintsev

Kologrivov

et al. 2019

Plasma Phys. Control. Fusion

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The spectral parameters of x-ray radiation in the wavelength range from 25 to 450 Å emitted by plasma of a vacuum discharge with a storage energy 45 J, induced on the Fe cathode by radiation from a neodymium laser with a power density up to 5•10 12 W cm −2 , are studied. On the basis of the collisional-radiative equilibrium model, a method was developed to produce a sufficiently accurate approximation of the experimental spectrum by a linear combination of the calculated spectra of plasma components with a given electron temperature and density. It was shown that the main part (>80%) of the radiation energy in the experimental spectra is provided by relatively cold peripheral plasma with a temperature of no more than 10 eV and a density of 5•10 17 cm −3 . It was established experimentally that a decrease in the laser power density due to the defocusing of the laser beam leads to an increase in the intensity of plasma radiation in the entire spectral range and a change in the spectral structure in the shortwave range. According to simulations, these changes are caused by an increase in the temperature and density of the micropinch formed in the discharge plasma up to 160 eV and 3•10 21 cm −3 , respectively.

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“…A number of papers are devoted to the study of the emission spectra of micropinches in the hard x-ray range at a wavelength λ<2 Å, i.e. with an energy greater than 6 keV (see, for instance, [1][2][3]).…”

Section: Introductionmentioning

confidence: 99%

X-ray spectra of plasma radiation from laser induced low-power vacuum discharge

Romanov

Kologrivov

Paperny

et al. 2017

Plasma Phys. Control. Fusion

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The x-ray spectra of plasma radiation in the wavelength range 30-300 Å are studied. The radiation is emitted from plasma of a vacuum discharge with storage energy less than 30 J that is initiated on an Al or Fe cathode by beam from neodymium laser with a power density up to 10 12 W cm −2 . It is shown that both the spectral composition and intensity of radiation of hot micropinch plasma that is formed in the cathodic jet are determined by the set of the discharge and the laser pulse characteristics. By optimizing these characteristics, a mode of the discharge operation is attainable, in which a significant portion of the radiation energy is located in the long-wave band of the quasi-continuum (230-270 Å and 160-200 Å for Al and Fe cathodes, respectively). That makes it possible to treat such a discharge as an intense source of narrowband soft x-ray radiation.

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Single-shot analysis of micropinches in a vacuum spark discharge

Cited by 11 publications

References 18 publications

Plasma points and radiative collapse in vacuum sparks

Plasma points and radiative collapse in vacuum sparks

Study of the possibility for increasing the emission of soft x-rays from the plasma of a low-energy vacuum discharge triggered by a laser

X-ray spectra of plasma radiation from laser induced low-power vacuum discharge

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