Spatial distribution of ion emission in gas-puff z-pinches and dense plasma foci

Klír, D.; Shishlov, A. V.; Jackson, S. L.; Kokshenev, V. A.; Kubeš, P.; Řezáč, K.; Beresnyak, Andrey; Cherdizov, R. K.; Cikhardt, J.; Cikhardtová, B.; Дудкин, Г. Н.; Engelbrecht, Joseph; Fursov, F. I.; Kaufman, Jan; Krása, J.; Kravárik, J.; Kurmaev, N. E.; Munzar, V.; Ratakhin, N. A.; Turek, K.; Варлачев, В. А.

doi:10.1088/1361-6587/ab6902

Cited by 9 publications

(3 citation statements)

References 45 publications

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“…As shown in Fig. 8, the experiments have a fairly complicated setup, including a hollow anode, cathode with rods, local plasma injection with plasma guns and neutral gas injection with a gas puff [32][33][34] . The plasma guns are used to inject plasma into the space between the coaxial electrodes.…”

Section: Comparison With Hawk Dpf Experimentsmentioning

confidence: 99%

Simulating a pulsed power-driven plasma with ideal MHD

Beresnyak,

Velikovich,

Giuliani

et al. 2022

Preprint

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We describe a simple practical numerical method for simulating plasma driven within a vacuum chamber by a pulsed power generator. Typically, in this type of simulation, the vacuum region adjacent to the plasma is approximated as a highly resistive, light fluid; this involves computationally expensive solvers describing the diffusion of the magnetic field through this fluid. Instead, we provide a recipe for coupling pulsed power generators to the MHD domain by approximating the perfectly insulating vacuum as a light, perfectly conducting, inviscid MHD fluid and discuss the applicability of this counter-intuitive technique. This, much more affordable ideal MHD representation, is particularly useful in situations where a plasma exhibits interesting three-dimensional phenomena, either due to the design of the experiment or due to developing instabilities. We verified that this coupling recipe works by modeling an exactly solvable flux compression generator as well as a self-similar Noh-like solution and demonstrated convergence to the theoretical solution. We also showed examples of simulating complex three-dimensional pulsed power devices with this technique. We release our code implementation to the public 1 .

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Section: Comparison With Hawk Dpf Experimentsmentioning

confidence: 99%

Simulating a pulsed power-driven plasma with ideal MHD

Beresnyak,

Velikovich,

Giuliani

et al. 2022

Preprint

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“…In these experiments, a rapid current disruption of the plasma neck in the z-pinch generated strong transient electric fields that accelerated hydrogen ion beams up to energies of tens of MeV [10]. Although the ion source was proved to be not point-like [11], the ion deflectometry measurements were made possible by modifying the classical experimental setup and using the distant on-axis pinhole camera where the ion beams were projected through a nearly point-like aperture. In other words, the nonpoint-like ion emission of the ion source was circumvented by the point-like projection of the pinhole camera.…”

Section: Introductionmentioning

confidence: 99%

Self-driven ion deflectometry measurements using MeV fusion-driven protons and accelerated deuterons in the deuterated hybrid x-pinch on the MAIZE LTD generator

Munzar,

Dowhan,

Klir

et al. 2024

Plasma Phys. Control. Fusion

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We report on the results of point-projection ion deflectometry measurements from a mid-size university zpinch experiment. A 1-MA 8-kJ LTD generator at the University of Michigan (called MAIZE) drove a hybrid x-pinch (HXP) with a deuterated polyethylene fiber load to produce a point-like source of MeV ions for backlighting. In these experiments, 2.7-MeV protons were generated by DD beam-target fusion reactions. Due to the kinematics of beam-target fusion, the proton energies were down-shifted from the more standard 3.02-MeV proton energy that is released from the center-of-mass rest frame of a DD reaction. In addition to the 2.7-MeV protons, strongly anisotropic beams of 3-MeV accelerated deuterons were detected by ion diagnostics placed at a radial distance of 90 mm from the x-pinch. Numerical reconstruction of experimental data generated by deflected hydrogen ion trajectories evaluated the total current in the vacuum load region. Numerical ion-tracking simulations show that accelerated deuteron beams exited the ion source region at large angles with respect to the pinch current direction.

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“…The short-lived pinched plasma is inevitable due to plasma instabilities; including Rayleigh-Taylor, Sausage and Kink instabilities [10][11][12]. The transient phenomenon leading to the disruption of the pinch have been correlated to the plasma emission such as soft and hard x-ray, energetic ions, electrons and neutrons [13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of ion beam emission in a low pressure plasma focus device

Lim¹,

Yap²,

Nee³

et al. 2021

Plasma Phys. Control. Fusion

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The plasma that accelerates and compresses in the formation of the pinch in dense plasma focus devices has been found to be an abundant source of multiple radiations like ion beams and x-rays. In this work, the ion beam and x-ray emissions from a 2.7 kJ (13.5 kV, 30 µF) plasma focus device operated at pressure below 1 mbar were investigated. The time profile of the ion beam emission was analysed from the simultaneously measured ion beam, soft and hard x-ray signals using biased ion collectors, BPX 65 silicon PIN diode and a scintillator-photomultiplier tube assembly. Time resolved analysis of the emissions revealed that the emission of the ion beam corresponded to several different pinching instances. Two components of the ion beam were identified. An ion beam of lower energy but higher intensity was emitted followed by an ion beam of higher energy but lower intensity in the first plasma pinch. The ion beam emitted from the first plasma pinch also has higher energy than subsequent plasma pinches. The emission was found to be associated with the amplitude of voltage spike. The results from ion beam and electron beams suggest that they were emitted by the same localized electric field induced in the pinched plasma. The strongest plasma focus discharge indicated by sharp voltage spike of high amplitude and highest ion beam energy were both observed at 0.2 mbar. The average energy of the ion beam obtained is (53 ± 13) keV. At this optimum condition, the ions beam with the highest energy also led to the highest hard x-ray emission.

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Spatial distribution of ion emission in gas-puff z-pinches and dense plasma foci

Cited by 9 publications

References 45 publications

Simulating a pulsed power-driven plasma with ideal MHD

Simulating a pulsed power-driven plasma with ideal MHD

Self-driven ion deflectometry measurements using MeV fusion-driven protons and accelerated deuterons in the deuterated hybrid x-pinch on the MAIZE LTD generator

Dynamics of ion beam emission in a low pressure plasma focus device

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