X-ray backlighting of the periphery of an imploding multiwire array in the Angara-5-1 facility

Grabovskiĭ, E. V.; Mitrofanov, K. N.; Oleĭnik, G. M.; Porofeev, I. Yu.

doi:10.1134/1.1648936

Cited by 49 publications

(22 citation statements)

References 8 publications

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“…Such a radiation source is ideal for the method of point projection X ray imaging, which is an efficient diagnostic means yielding both qualitative and quantitative data on the object under study [19]. Very often, this diagnostics is the only method applicable for investigating rapidly varying plasma objects [5,6,[19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Hybrid X-pinches

et al. 2012

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Results from experimental studies of a hybrid X pinch with an initial configuration in the form of a high current diode with conical tungsten electrodes spaced by 1-2 mm and connected to one another with 20 to 100 μm diameter wires are presented. The experiments were carried out at four facilities with a current amplitude from 200 to 1000 kA and front duration from 45 to 200 ns. It is shown that, in spite of their simpler configuration, hybrid X pinches with a short rise time of the current pulse (50-100 ns) are highly competitive with standard X pinches in the generated soft X ray power and the formation of a single hot spot in them is much more stable, while hard X ray emission is almost absent. The possibility of using hybrid X pinches as soft X ray sources for point projection X ray imaging of plasma objects is considered.

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Section: Introductionmentioning

confidence: 99%

Hybrid X-pinches

et al. 2012

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“…It was observed in many experiments, including those carried out at the Angara 5 1 facility [42,51], that, in the stage of plasma production, the material of each wire propagates toward the array axis in the form of plasma jets arranged along the wires with a charac teristic spatial period λ f . In [9,52], the quantity λ f was called the fundamental wavelength of axial modula tion.…”

Section: Tungsten Wire Arraysmentioning

confidence: 98%

“…The effects associated with the development of instabilities are traditionally studied by the methods of optical and X ray frame recording of plasma self radi ation [9,[39][40][41] and X ray plasma radiography [13,14,42,43].…”

Section: Introductionmentioning

confidence: 99%

Study of the termination phase of plasma production and the formation of magnetic flux breakthroughs during wire array implosion

et al. 2014

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The phenomenon of magnetic flux breakthrough into a wire array during its implosion was studied experimentally at the Angara 5 1 facility. It is shown that breakthroughs develop in the final stage of plasma production from the wire material and occur near the initial wire position. The spatial distributions of the azi muthal magnetic field within tungsten, molybdenum, copper, and aluminum wire arrays were studied using magnetic probes. The distributions of the azimuthal magnetic field B ϕ (z, t) along the array height in different stages of implosion were measured, and the characteristic dimensions of regions with a nonuniform magnetic field that appear during magnetic flux breakthroughs at the outer boundary of the wire array plasma were determined. The dimensions of these regions are compared with those of the regions with depressed plasma radiation observed in frame and time integrated X ray images. The dynamics of the distribution B ϕ (z, t) in regions with a nonuniform magnetic field during breakthroughs of the azimuthal magnetic flux is compared with that of the spatial distribution of pinch radiation in the frame X ray images in different stages of implo sion. The experimental data on the characteristics of spatially nonuniform breakthroughs of the magnetic flux into the wire array are analyzed using the plasma rainstorm model proposed by V.V. Aleksandrov et al. (JETP 97, 745 (2003)). The plasma density in the region of magnetic flux breakthrough is estimated.

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“…So, Fig. 12 demonstrates an obtained in [33] profile of the areal plasma density ρl near an outer radius of a single array. The X-axis in Fig.…”

Section: Spatial Non-uniformity Of Breakdown and Heterogeneity Of Coresmentioning

confidence: 98%

Heterogeneous Plasma‐Producing Structures at Current Implosion of a Wire Array

Grabovsky

Mitrofanov

Nedoseev

et al. 2005

Contrib. Plasma Phys.

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Characteristic properties of the plasma production process have been considered for the case of megampere currents flowing through hollow cylindrical wire arrays of the Angara-5-1 facility. In 3-4 nanoseconds after voltage applying to the wire surfaces there appear a plasma layer. The system becomes heterogeneous, i.e. consisting of a kernel of metal wires and a plasma layer. In several nanoseconds the current flow goes from metal to plasma, which results in reducing the electric field strength along the wire.The Joule heat energy delivered to the metal before the moment of complete current trapping by plasma is insufficient for the whole mass transition to a hot plasma state. The X-ray radiography techniques made it possible to detect and study dense clusters of substance of ∼1g/cm 3 at a developed discharge stage. The radial expansion velocity of ∼10 4 cm/s measured at the 70-th nanosecond after the current start allows treating the dense core at a late stage in the form of a submicron heterogeneous structure from its liquid and slightly ionized gas phase.

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X-ray backlighting of the periphery of an imploding multiwire array in the Angara-5-1 facility

Cited by 49 publications

References 8 publications

Hybrid X-pinches

Hybrid X-pinches

Study of the termination phase of plasma production and the formation of magnetic flux breakthroughs during wire array implosion

Heterogeneous Plasma‐Producing Structures at Current Implosion of a Wire Array

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