The study of pinch regimes based on radiation-enhanced compression and anomalous resistivity phenomena and their effects on hard x-ray emission in a Mather type dense plasma focus device (SABALAN2)

Piriaei, D.; Mahabadi, T. D.; Javadi, Saman; Ghoranneviss, M.; Saw, S. H.; Lee, S.

doi:10.1063/1.4936801

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…Ł. Marciniak carried out an exhaustive and systematic study in PF-24 in deuterium and argon and in argon-doped deuterium producing experimental results [308,309] to correlate with results from the Lee code, modified for gas mixtures. D Piriaei et al [310] correlated measurements of current and hard X-rays in the 25 kJ SABALAN2 with the 6-phase Lee code in order to obtain information on anomalous resistances and radiation-enhanced compressions in nitrogen and argon. Reviewing experimental data in view of the many gases involved and the required time resolution, it seems that the conclusive validation of the Lee model, in respect to its computations on radiation collapse in various gases, requires further research data which should include imaging with sufficient time resolution.…”

Section: Radiative Cooling and Collapsementioning

confidence: 99%

Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

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This paper is a sequel to the 1998 review paper “Scientific status of the Dense Plasma Focus” with 16 authors belonging to 16 nations, whose initiative led to the establishment of the International Center for Dense Magnetized Plasmas (ICDMP) in the year 2000. Its focus is on understanding the principal defining characteristic features of the plasma focus in the light of the developments that have taken place in the last 20 years, in terms of new facilities, diagnostics, models, and insights. Although it is too soon to proclaim with certainty what the plasma focus phenomenon is, the results available to date conclusively indicate what it is demonstrably not. The review looks at the experimental data, cross-correlated across multiple diagnostics and multiple devices, to delineate the contours of an emerging narrative that is fascinatingly different from the standard narrative, which has guided the consensus in the plasma focus community for several decades, without invalidating it. It raises a question mark over the Fundamental Premise of Controlled Fusion Research, namely, that any fusion reaction having the character of a beam-target process must necessarily be more inefficient than a thermonuclear process with a confined thermal plasma at a suitably high temperature. Open questions that need attention of researchers are highlighted. A future course of action is suggested that individual plasma focus laboratories could adopt in order to positively influence the future growth of research in this field, to the general benefit of not only the controlled fusion research community but also the world at large.

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Section: Radiative Cooling and Collapsementioning

confidence: 99%

Update on the Scientific Status of the Plasma Focus

Auluck

Kubeš

Paduch

et al. 2021

Plasma

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“…The physics of the pinch regimes could be explained by using the two versions of Lee's computational model. The applicability and predictability of Lee's computational model, which predicted each of the scenarios and clarified, have been tested by D. Piriaei [5]. A new 1.5 kJ Mather type dense plasma focus (DPF) was designed and constructed at Sahand University of Technology.…”

Section: Introductionsmentioning

confidence: 99%

Experimental study of the effect of circuit inductance on pinch-time in plasma focus MTPF2.5 KJ .

Nasaji

Nasiri

Esmaeli

et al. 2022

Jonra

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This paper investigates the effect of circuit inductance on the pinch-time of plasma focus. The dense plasma focus is a plasma discharge powered by a capacitor bank. The Mather type Dense Plasma Focus is constructed in cylindrical geometry and is made up of coaxial anodes and cathodes with varying radiuses. An insulator sleeve separates the electrodes, and the cathode rode forms circles around the anode tube. Different parameters, such as geometry and structure of the anode bar and decreasing inductance, are involved in optimizing plasma focus. One way to increase the gain and optimization of pulsed plasma systems is to reduce the circuit's inductance. For this purpose, we investigate the effect of different values of total circuit inductance on pinch formation time. Experimental and simulation results are compared. The proposed system shows a decent functionality that if the inductance reduces, the system's efficiency will increase.

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Experimental and numerical fitting of model parameters versus the gas pressure using six phase radiative Lee model in AECS PF‐1, 2 and INTI PF for nitrogen, argon, and neon gases

Al‐Hawat

Akel

Saw³

et al. 2020

Contributions to Plasma Physics

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Atomic energy commission of syria (AECS) PF‐1, 2 devices were operated in N2 and Ar gases at pressures varied between 0.1–1 mbar and applied voltage of 15 kV on the capacitors bank with capacitance of 25 μF. The voltage, current, and current derivative curves were digitally recorded by Ohmic voltage divider and two Rogowskii coils; one with a big number of turns for current and the other one with a low number of turns for the current derivative. Also, the current curve for the discharge as LCR circuit was recorded to calibrate the current measurement. By integrating the current derivative in time and using the curve of calibrated current, the current curve free of noise has been established. By inserting the geometrical and electrical parameters of two AECS PF‐1, 2 devices, the working gas pressure and the kind of the gas into six phase model which describes the instability in the plasma, and adding the anomalous resistance as a term in the current and voltage equations in the model; the computed curves for voltage and current were found and compared with the obtained experimental curves at the same conditions taking into account the readjustment of model parameters fm, fc, fmr, and fcr until getting a good fitting between the measured and computed currents. This fitting has proved the validity of six phase Lee model and its ability to give a description of plasma focus in the radial phase stage (which consists now of four subradial phases: radial inward shock, radial reflected shock, the pinch phase, and after that the instability phase), which is followed by the expanded phase of plasma focus. In parallel to our work, similar efforts were made on the INTI PF device in Ne; the validity of six phase Lee model was proved by getting a proper fitting between the measured and computed currents under the operational conditions. Moreover, the equivalent resistances and time scales of the anomalous resistance phases were obtained by this method; also, the ratios for PF device classification into two types according to the static inductance of the PF system were determined for N2 and Ar as working gases in AECS‐PF1, 2.

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The study of pinch regimes based on radiation-enhanced compression and anomalous resistivity phenomena and their effects on hard x-ray emission in a Mather type dense plasma focus device (SABALAN2)

Cited by 6 publications

References 25 publications

Update on the Scientific Status of the Plasma Focus

Update on the Scientific Status of the Plasma Focus

Experimental study of the effect of circuit inductance on pinch-time in plasma focus MTPF2.5 KJ .

Experimental and numerical fitting of model parameters versus the gas pressure using six phase radiative Lee model in AECS PF‐1, 2 and INTI PF for nitrogen, argon, and neon gases

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