Experimental Research of Dynamics and Macrostructure of Light Erosion Radiative Plasmodynamic Discharges

Pavlov, A. V.; Protasov, Yu. S.; Telekh, V. D.; Tshepanuk, T.

doi:10.1088/1742-6596/830/1/012062

Cited by 7 publications

(4 citation statements)

References 6 publications

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“…Practically, the PTFE installed below has always been used as a reference target, in order to exclude contamination of the studied samples by the products of its ablation. As a radiation source, a plasmodynamic radiating discharge (PDD) in a gas (Ne, Ar, Air, Neon with the 5 % addition of Air; PAr = 200 Torr, PNe = 400 Torr) was used, formed in a pulsed electromagnetic plasma accelerator of erosion type with electrodes of a coaxially end geometry (diameter 6 and 34 mm) and an ablating PTFE plasma-forming sleeve that is described in [16,20].…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…Radiation properties of the gas discharge in the energy range of photons to 20 eV are described in [16]. The radiation flux density generated by the MPC luminous surface discharge on a target calculated as in [21].…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…A photoerosion gas-plasma flow expanding into the external environment -as a diagnostic object, is rather complex and differs in a wide range of parameters -medium-mass velocities ṽ~ 10 4 -10 6 cm/с, densities n ~ 10 15 -10 19 cm -3 , temperatures T ~ 0,5 -50 kK, complex macrostructure, chemical and ionization composition. In this case, it is possible to realize high pressure and temperature gradients [3,7] and solid-gas-plasma phase transitions in intense light fields I0 ~ 10 5 -10 9 W / cm 2 and shock-wave loads (Mi ~ 0,3-3, p1 > 10 6 Pa) [16]. In addition, the study of the dynamics and macrostructure of light erosion gas-plasma flows is complicated by the need to visualize large optical fields.…”

Section: Introductionmentioning

confidence: 99%

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Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Pavlov¹,

Protasov²,

Telekh³

et al. 2019

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The dynamics and macrostructure of near-surface vapor-plasma fluxes arising from condensed substances evaporation in the field of broadband radiation of the UV-VUV spectrum range are studied using double-exposure laser holographic interferometry and schlieren photography (the Toepler scheme in the light field mode). The experimental setup was created on the basis of the unique scientific facility "Beam-M". Broadband UV and VUV radiation was generated by a plasma-dynamic emitting discharge of an end geometry coaxial erosion-type magnetoplasma compressor with an ablating fluoroplastic plasma-forming insulating sleeve in a gas. To control the emission spectrum of the discharge, gas filters were used (Ar, Ne, air, Ne mixture with 5% air). The emitter operated in the following mode: U = 20 kV, the stored energy W = 3.6 kJ, the energy input to the discharge was up to 3.2 kJ, with 30% in the first half-cycle of current, the maximum current is 160 kA, the half-cycle of discharge is 6 μs; the total radiation energy from the discharge was 1.0-1.2 kJ; the fraction of radiation in the VUV range of the spectrum was about 50% in Ne (hν ≤ 20 eV) and about 45% in Ar (hν ≤ 16 eV). It was shown that the implemented scheme of electromagnetic compatibility and protection ensures reliable synchronization of the electric discharge circuit and optical diagnostics components in the whole range of discharge characteristics. Optical diagnostics of near-surface gas-plasma flows was implemented on the basis of a second harmonic (532 nm) of a solid-state Nd:YAG laser (Solar LQ-115), its versatility was shown for studying various pulsed plasma processes with characteristic changes in gas concentrations of about 10 17-10 18 cm-3 and gradients of 10 19-10 20 cm-3. On the schlieren-pictures and interferograms, the zones characteristic of the studied type of radiation effects on materials were recorded: the gas-dynamic evaporation mode was realized (plasma piston mode), there was a shock wave in the gas, the contact boundary between the shock-compressed gas and the vapor plasma. The analysis of interferograms indicates that the regime of developed evaporation was preceded by a regime of diffusion evaporation. The use of extended samples allowed us to observe successive stages in the development of gas-dynamic perturbations during evaporation (due to the different distances between the target areas and the discharge). On the interferograms above the target, at different distances from the source of irradiation, 3 types of gas-dynamic perturbations were observed: acoustic wave, simple wave (Riemann wave), and shock wave. The effect of the energy characteristics of the discharge and the spectral composition of the radiation on the evaporation pattern was experimentally shown.

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Section: Experimental Conditionsmentioning

confidence: 99%

Section: Experimental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Pavlov¹,

Protasov²,

Telekh³

et al. 2019

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“…The magnetoplasma compressor (MPC) discharge plasma [1][2][3][4][5] acquires a quasi-stationary structure characteristic of the plasma dynamic mode. The main structural regions of the discharge light-erosion plasma are: i) cumulative jet with increased densities and temperatures, bounded by discontinuities (I); ii) region (II) of the main electromagnetic acceleration of the dielectric light-emitting plasma, bounded by the system of discontinuities of the and the surface of the face of the MPC;…”

Section: Introductionmentioning

confidence: 99%

Modeling of plasma dynamics parameters of magnetoplasma compressor

Batrak¹,

Kopaleishvili²

2022

8th International Congress on Energy Fluxes and Radiation Effects

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The prospect of magnetoplasma compressor (MPC) due to their technical and geometrical characteristics are discussed, the formulation of ways to improve their parameters is obtained. Thermal modeling of radiation-magneto plasma dynamic processes of powerful electric discharge sources is presented. The developed mathematical model is based on a nonstationary axisymmetric two dimensional system of equations for viscous one-temperature radiation plasma dynamics. This paper presents results of the numerical calculation.

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Experimental investigation of powerful wide band radiation interaction with the condensed matters

Nosov

Pavlov

Protasov

et al. 2018

J. Phys.: Conf. Ser.

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Experimental Research of Dynamics and Macrostructure of Light Erosion Radiative Plasmodynamic Discharges

Cited by 7 publications

References 6 publications

Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Laser holographic interferometry of short ultraviolet radiation with high power density interaction with condensed metters

Modeling of plasma dynamics parameters of magnetoplasma compressor

Experimental investigation of powerful wide band radiation interaction with the condensed matters

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