Experimental Detection of the Signs of a Coulomb Explosion in Micropinch Plasma

Dolgov, A. N.; Klyachin, N. A.; Prokhorovich, D. E.

doi:10.1134/s106378501903026x

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…Using expressions ( 6) and ( 27) in view of expression (24), which determines the temperature at which AT instabilities start developing, we may rewrite inequality (29) to obtain the following condition for the micropinch current:…”

Section: Comparison Of the Parameters Characterizing The Development ...mentioning

confidence: 99%

“…Although hot spots are observed in all varieties of Z pinches [20][21][22][23][24][25], such as plasma liners [1,2,26], vacuum sparks [27][28][29][30], X pinches [31][32][33][34], point Z pinches [35][36][37], and the like, their formation in X pinches turned out to be most convenient to study. An X pinch load is two or more wires intercrossed to form the letter X. X pinches, plasma focuses, were proposed to generate hot spots with prescribed parameters [31].…”

Section: Introductionmentioning

confidence: 99%

“…This explosion is possibly caused by the escape of fast electrons from the hot spot region. As a result, a positive space charge occurs, leading to a Coulomb explosion of the pinch plasma [29,30,38].…”

Section: Introductionmentioning

confidence: 99%

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Thermal instabilities in micropinches under turbulent heating conditions

Oreshkin¹,

Artyomov²,

Oreshkin³

2022

Plasma Phys. Control. Fusion

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Anomalous thermal instabilities occurring in micropinches are analyzed based on the theory of small perturbations. Instabilities of this type develop in a high-temperature plasma under turbulent heating conditions in the presence of an anomalous resistance resulting from the scattering of electrons by lower hybrid drift oscillations. When turbulent heating occurs in the plasma of a micropinch, its resistivity increases with decreasing density; this may lead to the formation of plasma layers normal to the current flow (stratification). For the anomalous thermal instability, a dispersion relation taking into account the effect of the plasma self-radiation has been derived, and the characteristic instability growth rates and wavelengths have been determined. A comparison of the development pattern has been performed between anomalous thermal and sausage-type magnetohydrodynamic instabilities. It has been shown that for any pinch material, there is a threshold current below which anomalous thermal instabilities prevail over magnetohydrodynamic instabilities. For the metals considered (aluminum, titanium, copper, molybdenum, and tungsten), the threshold currents are hundreds of kiloamperes. The threshold current increases with atomic number: for tungsten, it is approximately 3.5 times higher than for aluminum. The conclusions drawn from the analysis based on the linear small perturbation theory are compared with the results of experiments in which the parameters of "hot spots" formed in X pinches were determined.

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Section: Comparison Of the Parameters Characterizing The Development ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal instabilities in micropinches under turbulent heating conditions

Oreshkin¹,

Artyomov²,

Oreshkin³

2022

Plasma Phys. Control. Fusion

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“…The conventional version of the mechanism for the formation of a fast electron flow in a micropinch discharge assumes their acceleration in an electric field, which is generated due to the development of an abnormal plasma resistance upon a microstretch break as a result of the radiative compression [18][19][20]. Consequently, the authors' version about the possibility of a Coulomb explosion in a micropinch at the stage of the transition from the first to second compression, i.e., before the radiative compression [21], is confirmed.…”

mentioning

confidence: 99%

A Method for Investigating Nanosecond Processes in Micropinch Discharge Plasma

2022

Self Cite

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The technique is described and the results of studies of the spatial structure and dynamics of X-ray sources in the plasma of a micropinch discharge are presented. The applied technique made it possible to temporarily link the process of electron acceleration in a quasi-static electric field of a resistive nature to the process of forming a microstretch in a Z-pinch in a medium of heavy elements with a nanosecond time resolution.

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A method for calculating the radiation characteristics of nonequilibrium laboratory plasmas

Oreshkin,

Shmelev

2023

Physics of Plasmas

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One of the fundamentally important issues in the characterization of a dense high-temperature plasma is the description of its self-radiation aimed at determining the radiation losses and their spectral composition. In this paper, a new method is proposed for calculating the radiation characteristics of a high-temperature nonequilibrium plasma. The method is based on a collisional radiative model, which makes it possible to calculate the charge-state distribution in the plasma and the excited-state distribution of the plasma ions. The transfer equations are solved separately for the radiation with a continuous spectrum, combining the bremsstrahlung and recombination radiation spectra, and for the spectral line radiation. A feature of the method is that, when calculating the mean line absorption coefficients, dimensionless weighting coefficients are used, which make it possible to take into account the contribution of the strongest lines. The use of weighting coefficients has the result that even a one-group approximation yields good agreement with the numerical solution of the complete spectral problem.

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Experimental Detection of the Signs of a Coulomb Explosion in Micropinch Plasma

Cited by 3 publications

References 14 publications

Thermal instabilities in micropinches under turbulent heating conditions

Thermal instabilities in micropinches under turbulent heating conditions

A Method for Investigating Nanosecond Processes in Micropinch Discharge Plasma

A method for calculating the radiation characteristics of nonequilibrium laboratory plasmas

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