Energy balance in a Z pinch with suppressed Rayleigh–Taylor instability

Baksht, R. B.; Oreshkin, V. I.; Rousskikh, A. G.; Zhigalin, A. S.

doi:10.1088/1361-6587/aaa79b

Cited by 17 publications

(26 citation statements)

References 30 publications

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“…In general, the implosion pattern is quite consistent with the mechanism proposed in [20]: the radiator mass preheated by the shock wave 'is heated quasiadiabatically as long as the implosion continues'. Similar conclusions were obtained in [35,[42][43][44][45]. Unfortunately, the radiator mass cannot be determined within the framework of the snowplow model used by us, and we plan to carry out this work in the near future by using other diagnostics.…”

Section: Features Of the Compression Of A Pinch Imploding In The Tdp ...supporting

confidence: 69%

Effect of tailored density profiles on the stability of imploding Z-pinches at microsecond rise time megaampere currents

Cherdizov¹,

Baksht²,

Kokshenev³

et al. 2021

Plasma Phys. Control. Fusion

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To study the effect of the radial density profile of the material of a metal-plasma Z-pinch load on the development of magneto-Rayleigh-Taylor (MRT) instabilities, experiments have been performed at the Institute of High Current Electronics with the GIT-12 generator produced microsecond rise time megaampere currents. The load was an aluminum plasma jet with an outer plasma shell. This configuration provides the formation of a uniform current sheath in a Z-pinch load upon application of a high voltage pulse. It was successfully used in experiments with hybrid deuterium gas-puffs [Klir et al. 2020 New J. Phys. 22 103036]. The initial density profiles of the Z-pinch loads were estimated from the pinch current and voltage waveforms using the zero-dimensional "snowplow" model, and they were verified by simulating the expansion of the plasma jet formed by a vacuum arc using a two-dimensional quasi-neutral hybrid model [Shmelev et al. 2020 Phys. Plasmas 27 092708]. Two Z-pinch load configurations were used in the experiments. The first configuration provided tailored load density profiles, which could be described as ρ(r) ≈ 1/r^s for s > 2. In this case, MRT instabilities were suppressed and thus a K-shell radiation yield of 11 kJ/cm and a peak power of 0.67 TW/cm could be attained at a current of about 3 MA. For the second configuration, the radial density profiles were intentionally changed using a reflector. This led to the appearance of a notch in the density profiles at radii of 1–3 cm from the pinch axis and to magnetohydrodynamic instabilities at the final implosion stage. As a result, the K-shell radiation yield more than halved and the power decreased to 0.15 TW/cm at a current of about 3.5 MA.

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Section: Features Of the Compression Of A Pinch Imploding In The Tdp ...supporting

confidence: 69%

Effect of tailored density profiles on the stability of imploding Z-pinches at microsecond rise time megaampere currents

Cherdizov¹,

Baksht²,

Kokshenev³

et al. 2021

Plasma Phys. Control. Fusion

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“…On the contrary, when the resistivity decreases with increasing temperature, as is the case of a plasma, the growth of thermal instabilities should lead to the formation of individual current channels. This is exactly what is observed in experiments with imploding plasma liners [25][26][27][28][29][30][31][32], and filaments are also detected in the plasma affected by the axial magnetic field [25,26,31].…”

Section: Introductionsupporting

confidence: 86%

“…However, the presence of an axial magnetic field does not prevent the growth of other types of instabilities, particularly filamentation instabilities. Instabilities of this type, manifesting themselves as individual current channels, are often observed in plasma focus [21][22][23][24] and Z-pinch experiments [25][26][27][28][29][30][31][32]. To study the mechanism of growth of filamentation instabilities is relevant for the implementation of the MagLIF concept for the following reason.…”

Section: Introductionmentioning

confidence: 99%

Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Oreshkin¹,

Oreshkin²

2021

Plasma Phys. Control. Fusion

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The development of thermal filamentation (TF) instabilities in a current-carrying plasma shell under the action of the plasma self-radiation was analyzed in terms of a small perturbation theory. A stationary collisional radiative model was used to calculate the parameters of the bremsstrahlung, recombination radiation, and spectral line radiation. It has been shown that radiative losses can either enhance or weaken the growth of TF instabilities. The pattern of the effect is governed by the dependence of the energy lost by the plasma due to radiation, Q Rad, on the plasma temperature T. If Q Rad increases slower than ∼T, the radiative losses enhance TF instabilities. In the opposite case, that is when Q Rad increases faster than ∼T, the radiative losses lead to suppression of TF instabilities. When the energy lost due to radiation is greater than the Joule energy input, TF instabilities can be completely stabilized due to radiation. The plasma parameter ranges for which stabilization of TF instabilities may occur due to radiation have been found for aluminum and argon.

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“…Baksht et al considered the energy balance in the radiating metallic gas-puff Z pinch to study the energy balance in imploding Mg-shell-on-Bi-jet pinches and Mg-shell-on-Mg-jet. The power-law density distribution is observed in this type of Z pinch for promoting suppression of RTI that occurs during compression in the pinch plasma [47]. Mishra et al analyze the observations of an eruption in the intermediate corona consisting of magnetic Rayleigh-Taylor unstable plasma segment using the data collected from Solar Terrestrial relations Observatory [48].…”

Section: Review Of the Current Statusmentioning

confidence: 99%

Plasma Waves and Rayleigh–Taylor Instability: Theory and Application

Singh¹,

Vidhani²,

Yogi³

et al. 2023

Plasma Science - Recent Advances, New Perspectives and Applications

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The presence of plasma density gradient is one of the main sources of Rayleigh–Taylor instability (RTI). The Rayleigh–Taylor instability has application in meteorology to explain cloud formations and in astrophysics to explain finger formation. It has wide applications in the inertial confinement fusion to determine the yield of the reaction. The aim of the chapter is to discuss the current status of the research related to RTI. The current research related to RTI has been reviewed, and general dispersion relation has been derived under the thermal motion of electron. The perturbed densities of ions and electrons are determined using two fluid approach under the small amplitude of oscillations. The dispersion equation is derived with the help of Poisson’s equation and solved numerically to investigate the effect of various parameters on the growth rate and real frequency. It has been shown that the real frequency increases with plasma density gradient, electron temperature and the wavenumber, but magnetic field has opposite effect on it. On the other hand, the growth rate of instability increases with magnetic field and density gradient, but it decreases with electron temperature and wave number.

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Energy balance in a Z pinch with suppressed Rayleigh–Taylor instability

Cited by 17 publications

References 30 publications

Effect of tailored density profiles on the stability of imploding Z-pinches at microsecond rise time megaampere currents

Effect of tailored density profiles on the stability of imploding Z-pinches at microsecond rise time megaampere currents

Effect of the plasma self-radiation on the growth of thermal filamentation instabilities in imploding Z pinches

Plasma Waves and Rayleigh–Taylor Instability: Theory and Application

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