Investigations of Exploding Wires and Dielectric Fibres Dynamics

Bartnik, A.; Ivanenkov, G. V.; Karpinski, L.; Mingaleev, A. R.; Пикуз, С. А.; Romanova, V. M.; Stepnewski, W.; Shelkovenko, T. A.; Jach, K.

doi:10.1063/1.2949191

Cited by 3 publications

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“…Significant instabilities have been detected in previous studies in wires explosions excited by high current pulses [26][27][28]. Schlieren images taken with a 694.3 µm Ruby laser and absorption radiographs taken with 2-6 keV X-rays show the early onset of m = 0 instabilities in 15 µm Al wires exploded at a rate of 2.3 kA/ns (150 kA, 65 ns 10%-90% rise time) [27].…”

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Soft X-ray laser diagnostics of exploding aluminum wire plasmas

Hammarsten

Szapiro

Jankowska

et al. 2004

Applied Physics B: Lasers and Optics

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The evolution of current-driven thin single Al wire plasmas was studied with soft X-ray shadowgraphy and interferometry using a very compact capillary discharge-driven λ = 46.9 nm laser probe. Wires of 25 µm diameter excited by current pulses with a 78 A/ns increase rate were observed to expand uniformly at a rate of 3.5 µm/ns. In contrast, an increase in the rate of energy deposited per unit mass was observed to give rise to significant early plasma instabilities. The results illustrate the use of table-top soft X-ray lasers as a new tool for the diagnostics of dense pulse power driven plasmas.PACS 52.70.Kz; 52.59.Qy; 52.25.Vy; 52.50.Nr IntroductionInterferometry with optical lasers has been used for decades to obtain multi-dimensional maps of the electron density in a large variety of plasmas [1]. However, free-free absorption and refraction of the probe beam limit the maximum electron density, plasma size, and plasma density gradient that can be probed [2]. More recently, laboratory-size soft X-ray lasers have been used to extend the limits of plasma interferometry to larger plasma-scale lengths and higher plasma densities. A 15.5 nm Ne-like Y laser pumped by the Nova laser has successfully probed dense laser-created plasmas produced at Lawrence Livermore National Laboratory [2]. Due to limitations in the repetition rate of the X-ray laser, the experiments were limited to a few shots per day [2,3]. Recently, the use of compact saturated soft X-ray lasers [4][5][6] and the development of more robust interferometers [7] have advanced soft X-ray laser diagnostics as a practical tool for the study of high density plasmas [4][5][6][7]. Results of the study of the dynamics of several different laser-created plasmas have been recently reported [5][6][7]. Extremely compact capillary discharge soft-X-ray lasers [8,9], which are portable and have spectral brightness similar to or higher than that of their laboratory-size predecessors, produce laser pulses of about 1 ns duration that are particularly well suited for the diagnostics of dense pulse-power driven plasmas. Herein we report the results of the study of the evolution of current-induced u Fax: +1-970/491-8671, E-mail: rocca@engr.colostate.edu explosions of thin wires using a capillary discharge 46.9 nm laser in combination with a Mach-Zehnder interferometer in which diffraction gratings are used as beam splitters.The dynamics of thin exploding metal wire plasmas is of significant interest for the efficient generation of incoherent X-ray pulses of extremely high energy [10][11][12]. Fast Z-pinch implosions of cylindrical wire arrays have been shown to generate high energy density plasmas that emit very intense bursts of incoherent X-ray radiation capable of driving inertial confinement fusion targets [11]. In those experiments the main implosion phase, driven by multi-mega ampere currents, is preceded by a phase in which the heating, vaporization, and ionization of the wires in the array causes an expansion and merging of the individual plasmas into a co...

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confidence: 96%

Soft X-ray laser diagnostics of exploding aluminum wire plasmas

Hammarsten

Szapiro

Jankowska

et al. 2004

Applied Physics B: Lasers and Optics

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Dynamics of micropinches in exploding wire and vacuum spark plasmas

Robledo‐Martinez

Hernández-Ávila

Espino³

PPPS-2001 Pulsed Power Plasma Science 2001. 28th IEEE International Conference on Plasma Science and 13th IEEE International Pu

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X-pinch. Part I

2015

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Results of experimental studies of the Х-pinch since its invention and implementation in 1982 at the Lebedev Physical Institute are presented. The concept of the Х-pinch arose in the course of innovative experiments on studying the generation of hot dense plasma in nanosecond Z-pinches. The main idea was to localize the region occupied by the plasma and stabilize the moment of its formation. This was achieved by using a load in the form of crossed wires. The resulting plasma object turned out to be so interesting that a new scientific direction appeared in plasma physics. At present, studies in this direction are being performed in many laboratories worldwide. The term Х-pinch became conventional, and sections devoted to its study are always present at plasma conferences. Х-pinch is not only a very interesting scientific object, but also a unique source of X-ray emission with extreme parameters. The use of Х-pinches for point-projection X-ray radiography of high-energy-density objects provided many new experimental results. In some cases, the concepts of the processes occurring in matter upon fast energy deposition changed dramatically. The review consists of two parts. The first part briefly outlines the history of creation and studies of Х-pinches, describes the diagnostic techniques and devices developed during these studies, and presents the main results obtained in studying the physical processes occurring in the Х-pinch. The second part is devoted to the results of detailed studies of the Х-pinch hot spot-the region where the highest plasma parameters are achieved and which is a source of X-ray emission with extreme parameters. Some results of Х-pinch simulations are also presented.

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Investigations of Exploding Wires and Dielectric Fibres Dynamics

Cited by 3 publications

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Soft X-ray laser diagnostics of exploding aluminum wire plasmas

Soft X-ray laser diagnostics of exploding aluminum wire plasmas

Dynamics of micropinches in exploding wire and vacuum spark plasmas

X-pinch. Part I

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