Radiographic Investigation of Metal-Puff Plasma Jets Generated by Vacuum Arcs

Rousskikh, A. G.; Artyomov, A. P.; Zhigalin, A. S.; Fedyunin, A. V.; Oreshkin, V. I.

doi:10.1109/tps.2018.2849205

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…The time t impl , according to the simulations presented in [17] and in section 5 of this paper, is largely determined by the time of compression of the low-density part of the pinch. In [45], using x-ray photography, it was shown that the high-density part of a metal puff Z-pinch is a plasma jet with a directed axial velocity of ∼1.2 cm µs −1 . At the same time, some of the metal ions, due to several factors such as the thermal pressure and the reflection from the cathode grid, fly in the radial direction at approximately the same velocity: (0.8-1.3) cm µs −1 [15][16][17], forming a low-density halo.…”

Section: Resultsmentioning

confidence: 99%

Studies on the implosion of pinches with tailored density profiles

Oreshkin

Baksht

Cherdizov

et al. 2021

Plasma Phys. Control. Fusion

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This paper presents the results of experimental and theoretical studies of imploding metal-puff Z-pinches. The experiments were carried out on the MIG high-current pulse generator at a current level of about 2 MA and a current rise time of about 100 ns. A plasma gun was used to produce a plasma column with a tailored density profile through which the main electromagnetic pulse of the MIG generator was passed. The experiments have shown that pinches of this type, being compressed, are resistant to dynamic magneto-Rayleigh–Taylor (MRT) instabilities. The experimental results were analyzed using one-dimensional radiation magnetohydrodynamic simulations. It has been shown that in a pinch with a tailored density profile, the formation of a high-temperature plasma at the pinch axis and the generation of x-rays occur at the stagnation stage, i.e. under conditions close to Bennett equilibrium. At this stage, flute-like MRT instabilities develop, causing the pinch to decay.

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Section: Resultsmentioning

confidence: 99%

Studies on the implosion of pinches with tailored density profiles

Oreshkin

Baksht

Cherdizov

et al. 2021

Plasma Phys. Control. Fusion

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“…The radiation source was an X-pinch, which generated x-ray flashes of duration 3-5 ns. A detailed description of the X-pinch radiographic measurement technique can be found in [29][30][31]. The time-dependent jet mass determined by radiographic measurements was fitted by the polynomial function m jet (t) = −1.42t 3 + 61.8t 2 -688t + 15 with m jet measured in micrograms and t in microseconds.…”

Section: Z-pinch Loadsmentioning

confidence: 99%

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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“…Recently, the Institute of High-Current Electronics has been using plasma sources in the configuration schematically shown in Fig. 1 [1,2] to pump plasma liners for subsequent z-pinch implosion. Formally, the discharge burning in a plasma source of this type is a vacuum arc.…”

Section: Introductionmentioning

confidence: 99%

“…The average cathode current density here is the total current divided by the surface area of the cathode. In various experiments, a current from tens of kiloamperes to several megaamperes was passed through similar plasma sources [2][3][4]. Considering that the diameter of the cathode rod in the plasma gun was several millimeters, the average cathode current density reached 10 5 -10 6 A/cm 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Under such conditions, the specific cathodic erosion in interrupters remains close to the canonical cathodic specific erosion measured in low-current arcs (of the order of 15-170 µg/C for various metals [5]). By measuring the masses of plasma liners by various methods, it was concluded in [1][2][3][4] that the specific erosion of plasma sources (Fig. 1.)…”

Section: Introductionmentioning

confidence: 99%

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Numerical model of high current plasma source

Shmelev¹,

Chaikovsky²,

Uimanov³

et al. 2022

8th International Congress on Energy Fluxes and Radiation Effects

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In this paper, we numerically analyze a “capillary” type plasma source used to create plasma liners in gas puff z-pinch experiments. It is shown that erosion from a plasma source of this type, observed in the experiment, is provided by evaporation of the electrodes. Moreover, the main contribution comes from evaporation from the anode. The calculation results are in qualitative agreement with the experimental data.

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Radiographic Investigation of Metal-Puff Plasma Jets Generated by Vacuum Arcs

Cited by 12 publications

References 19 publications

Studies on the implosion of pinches with tailored density profiles

Studies on the implosion of pinches with tailored density profiles

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

Numerical model of high current plasma source

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