Reconstruction of the parameters of a soft X-radiation spectrum from signals of vacuum X-ray diodes

Branitskii, A. V.; Oleinik, G. M.

doi:10.1007/bf02758950

Cited by 19 publications

(4 citation statements)

References 4 publications

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“…The emitted power is measured in the X-ray energy range of 0.1 to 2 kV [6]. The spectral range and sensitivity for each channel of the recording system depend on the spectral sensitivity of the XRD photocathode and the spectral transmission of the filters-absorbers selected.…”

Section: Methods Of Plasma Diagnostics Of Current Driven Wire Arrmentioning

confidence: 99%

Diagnostics of plasma on installation Angara-5-1

Oleinik

Volkov

Grabovskiĭ

et al. 2007

2007 16th IEEE International Pulsed Power Conference

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The set of diagnostic techniques used at the Angara-5-1 facility that make it possible to study the processes which accompany the ultrafast current driven implosion of liners is described. This set includes electric methods and methods for the detection of various radiations. Current and voltage measurement allow to evaluate a load inductance and R-t diagram of implosion. Micro-B-dot probes make it possible to measure current distribution inside liner. The liner-plasma shapes are visualized by detecting the intrinsic liner radiation in various wavelength ranges and actively probing liners in the visible and X-ray regions. Examples of the results of studying the current driven implosion of cylindrical arrays of tungsten wires at the Angara-5-1 facility are presented.

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Section: Methods Of Plasma Diagnostics Of Current Driven Wire Arrmentioning

confidence: 99%

Diagnostics of plasma on installation Angara-5-1

Oleinik

Volkov

Grabovskiĭ

et al. 2007

2007 16th IEEE International Pulsed Power Conference

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“…Magnetic probe measurements [38] have shown that the motion of Al and Bi plasmas toward the array axis is delayed by 5-10 ns as compared to that of the plasma produced from tungsten wires. This makes it possible to reduce the influence of the zipper effect on the compression of the material of a quasi spheri cal array with an inhomogeneous distribution of the linear mass by appropriately choosing the material deposited on the fibers.…”

Section: Implosion Of Quasi Spherical Wire Arraysmentioning

confidence: 98%

“…The X ray power was measured using four vacuum X ray diodes (XRDs) based on open vacuum photo diodes equipped with sets of X ray filters of different hardness [38]. The spectral sensitivities of the s1e and s4e type XRDs, used to measure the X ray yield in two photon energy ranges, are given in Fig.…”

Section: Arrangement Of Experiments Technolofy Of Fabricating Quasi mentioning

confidence: 99%

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Study of the implosion characteristics of quasi-spherical wire arrays on the Angara-5-1 facility at currents of up to 4 MA

et al. 2012

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Results are presented from experimental studies of the spatial distribution of the density of matter in the central part of the discharge gap and the formation of the temporal profile of the X ray power in the course of implosion of quasi spherical wire arrays at discharge currents of up to 4 MA. The spatial distribution of the X ray intensity in the central part of the discharge gap and the temporal profile of the X ray power are used as implosion characteristics of quasi spherical wire arrays. The quasi spherical arrays were formed by the radial stretching of unstrained wires of initially cylindrical and conical wire arrays under the action of the electrostatic field. The temporal profile of the output X ray pulse in the photon energy range of 0.1-1 keV is shown to depend on both the geometrical parameters of the quasi spherical array and the longitudinal distri bution of its mass. It is found that a 40% increase in the wire mass due to deposition of an additional mass in the equatorial region of a quasi spherical array leads to a 15% increase in the average current radius of the pinch and a 30% decrease in the X ray yield. Experiments with quasi spherical arrays made of kapron fibers with deposited Al and Bi conducting layers were also carried out. It is demonstrated that application of such arrays makes it possible to control the profile and duration of the generated X ray pulse by varying the mass, material, and location of the deposited layer. It is found that deposition of an additional mass in the form of a thin Bi stripe on tungsten wires near the cathode end of the array allows one to mitigate the influence of the cathode zipper effect on the pinch compression and formation of the X ray pulse in tungsten arrays.

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Investigation of Al plasmas from thin foils irradiated by high-intensity extreme ultraviolet

Grabovski

Sasorov

Shevelko

et al. 2017

Matter and Radiation at Extremes

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Dynamics and spectral transmission of Al plasma produced by extreme ultraviolet (EUV) irradiation of 0.75-μm thick Al foil is investigated. The EUV radiation with the peak power density in the range of 0.19–0.54 TW/cm2 is provided by Z-pinch formed by W multiwire array implosion in the Angara-5-1 facility. Geometry of the experiment ensures that there are no plasma fluxes from the pinch toward the Al foil and plasma. The same EUV source is used as a back illuminator for obtaining the absorption spectrum of Al plasma in the wavelength range of 5–24 nm. It comprises absorption lines of ions Al4+, Al5+, Al6+, Al7+. Analysis of relative intensities of the lines shows that those ions are formed in dense Al plasma with a temperature of ∼20 eV. Dynamics of Al plasma has been investigated with transverse laser probing. We have also performed radiation-gas-dynamics simulations of plasma dynamics affected by external radiation, which includes self-consistent radiation transport in a plasma shell. The simulations show good agreement with an experimental absorption spectrum and with experimental data concerning plasma dynamics, as well as with the analysis of line absorption spectrum. This confirms the correctness of the physical model underlying these simulations.

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Reconstruction of the parameters of a soft X-radiation spectrum from signals of vacuum X-ray diodes

Cited by 19 publications

References 4 publications

Diagnostics of plasma on installation Angara-5-1

Diagnostics of plasma on installation Angara-5-1

Study of the implosion characteristics of quasi-spherical wire arrays on the Angara-5-1 facility at currents of up to 4 MA

Investigation of Al plasmas from thin foils irradiated by high-intensity extreme ultraviolet

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