Hybrid MHD/PIC simulation of a deuterium gas puff z pinch

Shmelev, D. L.; Oreshkin, V. I.; Chaikovsky, S. A.

doi:10.1088/1742-6596/830/1/012018

Cited by 5 publications

(3 citation statements)

References 15 publications

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“…where v is the fluid velocity, n is the electron density and where the pressure gradient and inertia terms are neglected. Large electric fields in z-pinches are often ascribed to the v×B term during global [46][47][48][49] or local [2,9,13,[50][51][52][53] implosions. (Note: mechanisms based on explosions [54,55] should produce electric fields towards the anode.)…”

Section: Acceleration Mechanisms Based On the Generation Of Axial Elementioning

confidence: 99%

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

et al. 2018

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Acceleration of high energy ions was observed in z-pinches and dense plasma foci as early as the 1950s. Even though many theories have been suggested, the ion acceleration mechanism remains a source of controversy. Recently, the experiments on the GIT-12 generator demonstrated acceleration of ions up to 30 MeV from a deuterium gas-puff z-pinch. High deuteron energies enable us to obtain unique information about spatial, spectral and temporal properties of accelerated ions. In particular, the offaxis ion emission from concentric circles of a ∼1 cm diameter and the radial lines in an ion beam profile are germane for the discussion of acceleration mechanisms. The acceleration of 30 MeV deuterons can be explained by the fast increase of an impedance with a sub-nanosecond e-folding time. The high (>10 Ω) impedance is attributed to a space-charge limited flow after the effective ejection of plasmas from m=0 constrictions. Detailed knowledge of the ion acceleration mechanism is used with a neutron-producing catcher to increase neutron yields above 10 13 at a currentof2.7 MA.

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Section: Acceleration Mechanisms Based On the Generation Of Axial Elementioning

confidence: 99%

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

et al. 2018

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“…The applicability of this code for the Z-pinch compression related problems was tested in. 25,26 Here we will give only brief description of the main equation system.…”

Section: Model Descriptionmentioning

confidence: 99%

Formation of double shell during implosion of plasma metal puff Z-pinches

et al. 2020

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This work presents the results of experimental and theoretical research of impact of tailored density profile and application of external axial magnetic field on initial spatial distribution of the plasma density in the plasma metal puff Z-pinch and on its implosion dynamics. It has been discovered that upon implosion of the plasma metal puff Z-pinch some stripes interpreted as the system of two coaxial shells appear on the optical images. With the help of numerical simulation, the formation of the plasma liner consisting of a mixture of carbon and bismuth ions and formed by the expansion of the plasma jet of the arc burning on the bismuth electrode has been considered in this work. It has been shown that the lightweight carbon ions facilitate formation of the density distribution smoothly decreasing with the increase in radius, that, in turn, leads to suppression of the Rayleigh-Taylor instability in the current sheath upon further implosion. It has also been demonstrated that availability of the two types of ions in plasma considerably different in mass leads to formation (in the compression phase) of a double shell with externally located heavy ions. It has also been revealed that the application of the external axial magnetic field leads to reduction in the plasma metal puff Z-pinch initial diameter.

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“…The two-dimensional hybrid model of quasi-neutral plasma in the context of 2D axisymmetric geometry developed earlier [6,7] has been modified into a 2.5-dimensional model. The new modification takes into account the all three components of ion and electron velocities, current and magnetic field, but all the components depend only on the two variables -r and z.…”

Section: Model Descriptionmentioning

confidence: 99%

Hybrid MHD/PIC Simulation of a Metallic Gas-Puff Z-Pinch Implosion

Shmelev

Oreshkin

Chaikovsky

2018

2018 28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

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We present the hybrid MHD/PIC simulations of the time evolution of a bismuth metallic gas-puff z pinch in external axial magnetic field (AMF). Recent experiments with IMRI-5 generator (450 kA, 450 ns) [1] show the certain effect of an axial magnetic field on radiation energy produced during z pinch implosion. In order to perform the numerical simulation of gas puff z pinch a hybrid model was developed. The hybrid model treats the electrons as a massless fluid and ions as macroparticles. The macroparticle dynamic is calculated with the use of PIC method. Ion-ion Coulomb collision is considered with the use of MC method. The radiation transfer of bismuth plasma was accounted in the framework of P1 method. The interelectrode gap pumping by plasma of 8 µs 80 kA bismuth arc with the following plasma implosion by 450 kA/ 450 ns current pulse in different external AMF was modelled. The obtained results are in a reasonable agreement with the experimental results.

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Hybrid MHD/PIC simulation of a deuterium gas puff z pinch

Cited by 5 publications

References 15 publications

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Ion acceleration mechanism in mega-ampere gas-puff z-pinches

Formation of double shell during implosion of plasma metal puff Z-pinches

Hybrid MHD/PIC Simulation of a Metallic Gas-Puff Z-Pinch Implosion

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