Space-resolved studies of X-ray spectra within Plasma-Focus system

Jakubowski, L.; Sadowski, M.; Baronova, E. O.

doi:10.1007/bf03165876

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…To perform an accurate spectral analysis of the X-ray lines, which are easily observable when a high-Z gas (e. g. argon) is added, the use was made of two identical crystal spectrometers oriented in the radial directions, but with mutually perpendicular dispersion planes. It was proved that the recorded X-ray spectral lines can be assigned to individual hot spots [12]. On the basis of those spectral lines it was estimated that the local electron concentration amounts to 10 20 ÷ 10 21 cm −3 and the local electron temperature exceeds 1 keV.…”

Section: Role Of the Current Filamentsmentioning

confidence: 99%

Formation and role of filaments in high-current discharges of the pinch type

Sadowski

Malinowska

2006

Czech J Phys

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The paper concerns distinct current filaments which appear inside plasma layers and columns produced by high-current pulse discharges of the Z-pinch and Plasma-Focus (PF) type. Results obtained previously, e. g. pictures taken with high-speed cameras, soft X-ray pinhole images, measurements of angular distributions of fast deuterons, images of so-called hot-spots inside the pinch column etc., have been reviewed and explained on the basis of the filamentary model. For the first time results of the measurements of fusion-produced protons, which were performed at different azimuthal angles (around the pinch column), have been presented. These results constitute a new experimental evidence of the appearance and role of the current filaments in pinch-type discharges.

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Section: Role Of the Current Filamentsmentioning

confidence: 99%

Formation and role of filaments in high-current discharges of the pinch type

Sadowski

Malinowska

2006

Czech J Phys

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“…This is connected with different values of the electron concentration and temperature in individual hot-spots. Some estimates were performed in the previous experiments [12]. For the considered case it was estimated that the electron concentration in the first hot-spots was 1.5 × 10 21 cm −3 , while that in second hot-spot was 3.2 × 10 20 cm −3 .…”

Section: Study Of Correlation Of Highly-ionized Argon Lines With Appementioning

confidence: 99%

Temporal characteristics of electron beams from plasma-focus and their correlation with highly-ionized Ar-lines

2004

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The paper reports on studies of pulsed electron beams measured along and perpendicularly to the z-axis, as well as other characteristics of plasma-focus discharges. Studies of highly-ionized argon-lines, as measured with temporal-resolution, are also presented. It has been found that the emission of highly ionized argon lines is well correlated with the electron beams and the appearance of successive hot-spots.

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“…Experimental observations of the polarization of the He-like x-ray lines have been carried out for solar flares [10], laser-produced plasma [11], vacuum spark plasma [12] and PF discharges [13]. The results of such investigations can hardly be interpreted with this knowledge, because there are serious theoretical difficulties.…”

Section: Introductionmentioning

confidence: 99%

X-ray polarization studies of plasma focus experiments with a single hot spots

2004

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In high current pulse discharges of the plasma focus (PF) type, inside the collapsing pinch column, there are formed local micro-regions of high-density and high-temperature plasma, so-called hot spots. Individual hot spots are separated in space and time. Each hot spot is characterized by its specific electron concentration and temperature, as well as by the emission of x-ray lines with different polarization. When numerous hot spots are produced it is impossible to determine local plasma parameters and to interpret the polarization effects. To eliminate this problem this study was devoted to the realization of PF-type discharges with single hot spot only. It has been achieved by a choice of the electrode configuration, which facilitated the formation of a single hot spot emitting intense x-ray lines. At the chosen experimental conditions it was possible to determine local plasma parameters and to demonstrate evident differences in the polarization of the observed x-ray lines.

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Space-resolved studies of X-ray spectra within Plasma-Focus system

Cited by 8 publications

References 3 publications

Formation and role of filaments in high-current discharges of the pinch type

Formation and role of filaments in high-current discharges of the pinch type

Temporal characteristics of electron beams from plasma-focus and their correlation with highly-ionized Ar-lines

X-ray polarization studies of plasma focus experiments with a single hot spots

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