Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

Lim, L. K.; Yap, S. L.; Bradley, D.A.

doi:10.1371/journal.pone.0188009

Cited by 9 publications

(7 citation statements)

References 45 publications

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“…The calculations of the electron temperature and ion density for two types of plasma-forming gases are shown in table 1. These results were compared with other works [15,26] and are in good agreement.…”

Section: Resultssupporting

confidence: 81%

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Tazhen¹,

Dosbolayev²,

Рамазанов³

2022

Plasma Sci. Technol.

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Due to the growing interest in studying the compression and disruption of the plasma filament in magnetic fusion devices and Z-pinches, this work may be important for new developments in the field of controlled thermonuclear fusion. Recently, on a coaxial plasma accelerator (CPA), we managed to obtain the relatively long-lived (~300 µs) plasma filaments with its self-magnetic field. This was achieved after modification of the experimental setup by using high-capacitive and low-inductive energy storage capacitor banks, as well as electrical cables with low reactive impedance. Furthermore, we were able to avoid the reverse reflection of the plasma flux from the end of the plasma accelerator by installing a special plasma-absorbing target. Thus, these constructive changes of the experimental setup allowed us to investigate the physical properties of the plasma filament by using the comprehensive diagnostics including Rogowski coil, magnetic probes, and Faraday cup (FC). As a result, such important plasma parameters as density of ions and temperature of electrons in plasma flux, time dependent plasma filament's azimuthal magnetic field were measured in discharge gap and at a distance of 23.5 cm from the tip of the cathode. In addition, the current oscillograms and I-V characteristics of the plasma accelerator were obtained. In the experiments, we also observed the charge separation during the acceleration of plasma flow via oscillograms of electron and ion beam currents.

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Section: Resultssupporting

confidence: 81%

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Tazhen¹,

Dosbolayev²,

Рамазанов³

2022

Plasma Sci. Technol.

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“…Further studies show:-Longer electrodes and lower pressures of deuterium producd more energetic ions[456]. -Faraday cups were used to determine deuteron-beam energy and deuteron-beam fluence per shot while CR-39 solid-state nuclear track detectors were employed in studying the angular distribution of deuteron emission[457]. In the most optimum deuterium filling of 0.2 mbar, the ion beam measured was 52 ± 7 keV, with fluence of 10 1 ⁵ ions/m 2 .…”

mentioning

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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“…While interaction of the thermal deuterons under maximum compression produces thermal neutrons (thermonuclear neutron production), beam-target neutrons are produced through fusion reactions with the accelerated ion beams that interact with thermal deuterons under diode voltage. Neutron yield and energy of neutrons are anisotropic which leads to the dominant beam-target neutron production compared to thermonuclear neutron production in plasma focus devices, which is also the case in this study with spherical plasma focus device [6][7][8].…”

Section: Introductionmentioning

confidence: 73%

Neutron yield and ion production with respect to cathode radius in spherical plasma focus

2020

Journal of Energy Systems

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The effect of the cathode radius variation (from 11.5 cm to 17 cm) on neutron yield, discharge current, plasma temperature, and ion properties (velocity, energy, and density) are investigated in this study using the developed spherical plasma focus model and the results are reported in this paper. Peak discharge current and peak beam-ion properties decrease with increasing the cathode radius. Maximum plasma temperature (22.34 eV) and maximum beam-target neutron yield (1.18×10 13 ) are achieved using the cathode with 15 cm radius. The longest pinch duration for all calculations is also achieved using 15 cm cathode radius. It is found that the optimum cathode radius is 15 cm in terms of the neutron yield, plasma temperature and beam-ion properties in spherical plasma focus device. Cite this paper as:Ay, Y., Neutron yield and ion production with respect to cathode radius in spherical plasma focus.

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Time-resolved characteristics of deuteron-beam generated by plasma focus discharge

Cited by 9 publications

References 45 publications

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Investigation of self-generated magnetic field and dynamics of a pulsed plasma flow

Update on the Scientific Status of the Plasma Focus

Neutron yield and ion production with respect to cathode radius in spherical plasma focus

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