Influence of the radiation of the plasma-focus current sheath on the implosion dynamics of condensed targets

Krauz, V. I.; Levashova, M.G.; Karakin, M. A.; Крохин, О. Н.; Lisitsa, V. S.; Mokeev, A. N.; Myalton, V. V.; Nikulin, V. Ya.; Огинов, А. В.; Smirnov, V. P.; Фортов, В. Е.

doi:10.1134/s1063780x08010054

Cited by 13 publications

(6 citation statements)

References 4 publications

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“…In the final stage of implosion inside the region of radius r = 2 cm, this can be less than 1 cm. (4) The thickness of the current carrying layer in the near-axis region is numerically equal to the width of the radial distribution of the plasma electron density obtained by laser interferometry in the final stage of implosion (Figure 110) [420,421]. (5) The measurements lead to two important conclusions: a.…”

Section: Pf-3mentioning

confidence: 99%

“…Later, similar experiments were also carried out with other types of loads. A thin-walled foam liner with a diameter of 10-20 mm [421,440], tungsten wire arrays [440][441][442][443], fine aluminium wires and deuterated polyethylene fibers [441,444], fine-dispersed submicron alumina dust powder [421,440,441,445], and other loads were employed. The possibility of load compression after the current is switched over from a non-cylindrical PCS to different types of loads was demonstrated in experiments carried out at the PF-3 facility.…”

Section: Plasma Focus As Driver For Condensed Targetsmentioning

confidence: 99%

“…At sufficiently high radiation intensities, this can lead to a substantial preheating of the target located at the axis and a faster transition of the condensed target material into a plasma state. Radiative losses from the current sheath of a plasma focus in neon, argon, and hydrogen with a 2% admixture of Xe are calculated with allowance for the line, bremsstrahlung, and recombination radiation [421]. It is shown that the temperature of the neon plasma (10-15 eV) is quite sufficient to evaporate Al 2 O 3 grains of radii 10-20 µm.…”

Section: Plasma Focus As Driver For Condensed Targetsmentioning

confidence: 99%

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Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

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This paper is a sequel to the 1998 review paper “Scientific status of the Dense Plasma Focus” with 16 authors belonging to 16 nations, whose initiative led to the establishment of the International Center for Dense Magnetized Plasmas (ICDMP) in the year 2000. Its focus is on understanding the principal defining characteristic features of the plasma focus in the light of the developments that have taken place in the last 20 years, in terms of new facilities, diagnostics, models, and insights. Although it is too soon to proclaim with certainty what the plasma focus phenomenon is, the results available to date conclusively indicate what it is demonstrably not. The review looks at the experimental data, cross-correlated across multiple diagnostics and multiple devices, to delineate the contours of an emerging narrative that is fascinatingly different from the standard narrative, which has guided the consensus in the plasma focus community for several decades, without invalidating it. It raises a question mark over the Fundamental Premise of Controlled Fusion Research, namely, that any fusion reaction having the character of a beam-target process must necessarily be more inefficient than a thermonuclear process with a confined thermal plasma at a suitably high temperature. Open questions that need attention of researchers are highlighted. A future course of action is suggested that individual plasma focus laboratories could adopt in order to positively influence the future growth of research in this field, to the general benefit of not only the controlled fusion research community but also the world at large.

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Section: Pf-3mentioning

confidence: 99%

Section: Plasma Focus As Driver For Condensed Targetsmentioning

confidence: 99%

Section: Plasma Focus As Driver For Condensed Targetsmentioning

confidence: 99%

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Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

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“…According to our estimates (Krauz et al. 2008) the intensity of neon plasma radiation is more than an order of magnitude higher than the intensity of hydrogen plasma radiation at a temperature of 5 eV owing to the presence of intense lines of Ne I and Ne II.…”

Section: Discussion Of Results and Conclusionmentioning

confidence: 62%

“…In the case of gas puff, a plasmoid containing elements with a large Z, and therefore characterized by higher emissivities, always propagates in a chamber filled with deuterium. According to our estimates (Krauz et al 2008) the intensity of neon plasma radiation is more than an order of magnitude higher than the intensity of hydrogen plasma radiation at a temperature of 5 eV owing to the presence of intense lines of Ne I and Ne II.…”

Section: Discussion Of Results and Conclusionmentioning

confidence: 69%

Properties of toroidal magnetic fields in axial plasma flow on the PF-1000U plasma focus facility

et al. 2020

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This paper presents the results of studies of plasma flow parameters on the PF-1000U facility. A distinctive feature of this facility is the ability to create profiled initial gas distributions using gas puffs. In the experiments described, a combined system for filling the vacuum chamber with a working gas was used, in which an additional injection of various gases (deuterium, helium, neon and their mixtures) into the axial region of the chamber prefilled with deuterium was performed using a pulse valve. Thus, both the pinching processes and, accordingly, the generation of axial plasma flows and the conditions of their propagation in the background gas of the facility chamber were affected. Regimes with the generation of compact stable plasma formations propagating over long distances were found. The results obtained can be used in laboratory modelling of astrophysical jets from young stellar objects.

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