Angular Distribution of Argon Ions and X-Ray Emissions in the Apf Plasma Focus Device

Etaati, G. R.; Amrollahi, R.; Habibi, M.; Baghdadi, Reza

doi:10.1007/s10894-010-9360-5

Cited by 21 publications

(14 citation statements)

References 26 publications

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“…Typical plasma lengths of 0.6-1 cm have been measured from visible light emission using an ICCD camera in this device [7]. The data also agree with the scaling law to within a factor of two.…”

Section: Resultssupporting

confidence: 68%

“…Multiple papers [2,3,7] reported that the optimum gas fill pressure for high energy beam production was lower than the optimum fill pressure for maximum neutron production. The DPF scaling law published by Lee and Saw [8] finds that the average ion energy from a DPF is between 25-292 keV and is independent of the device energy, but the beam current scales with the peak current of the device and the beam ion number (ions/kJ) scales with the energy of the device.…”

Section: Introductionmentioning

confidence: 99%

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Ion beam and neutron output from a sub-kilojoule dense plasma focus

Ellsworth¹,

Falabella²,

Schmidt³

et al. 2014

AIP Conference Proceedings

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Abstract. We are seeking to gain a better fundamental understanding of the ion beam acceleration and neutron production dense plasma focus (DPF) device. Experiments were performed on a kilojoule level, fast rise time DPF located at LLNL. Ion beam spectra and neutron yield were measured for deuterium pinches. Visible light images of the pinch are used to determine the pinch length. In addition, an RF probe was placed just outside the cathode to measure fluctuations in Ez up to 6 GHz, which is within the range of the lower hybrid frequencies. We find these oscillations arise at a characteristic frequency near 4 GHz during the pinch. Comparisons of the neutron yield and ion beam characteristics are presented. The neutron yield is also compared to scaling laws.

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Ion beam and neutron output from a sub-kilojoule dense plasma focus

Ellsworth¹,

Falabella²,

Schmidt³

et al. 2014

AIP Conference Proceedings

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“…As a result, for all plasma-material interaction studies by means of different scale PFDs from PF-1000141819 to miniature PFDs20, the specimens are usually placed along the z-axis of the PFD chamber to be exposed to ions by applying several pinch shots21. Many exclusive studies have been performed on ion emission angular distribution profiles on X or Y axes of PFDs; some studies have reported maxima22232425 and some have shown minima262728293031, on the profiles, on or around the z-axis. Some theoretical models have also been developed to justify ion angular distribution profiles around the z axis222324293032333435.…”

mentioning

confidence: 99%

Breakthrough in 4π ion emission mechanism understanding in plasma focus devices

Sohrabi

Zarinshad

Habibi

2016

Sci Rep

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Ion emission angular distribution mechanisms in plasma focus devices (PFD) have not yet been well developed and understood being due to the lack of an efficient wide-angle ion distribution image detection system to characterize a PFD space in detail. Present belief is that the acceleration of ions points from “anode top” upwards in forward direction within a small solid angle. A breakthrough is reported in this study, by mega-size position-sensitive polycarbonate ion image detection systems invented, on discovery of 4π ion emission from the “anode top” in a PFD space after plasma pinch instability and radial run-away of ions from the “anode cathodes array” during axial acceleration of plasma sheaths before the radial phase. These two ion emission source mechanisms behave respectively as a “Point Ion Source” and a “Line Ion Source” forming “Ion Cathode Shadows” on mega-size detectors. We believe that the inventions and discoveries made here will open new horizons for advanced ion emission studies towards better mechanisms understanding and in particular will promote efficient applications of PFDs in medicine, science and technology.

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“…They observed that the flux of hydrogen ions is maximum at the device axis, whereas the carbon flux peaks around 15 respect to the device axis. Etaati et al 16 measured the angular distribution of argon ions in different pressures using an array of Faraday cups and resulted an anisotropic behavior with the maximum ion emission confined within 0 -11 . In addition to many works which have been done for characterizing the ions in Mather type PF devices, a few works have studied the ion emission in Filippov type machines.…”

Section: Introductionmentioning

confidence: 99%

Angular distribution of energetic argon ions emitted by a 90 kJ Filippov-type plasma focus

Pestehe

Mohammadnejad

2015

Physics of Plasmas

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Characteristics of the energetic argon ions emitted by a 90 kJ Filippov-type plasma focus are studied by employing an array of Faraday cups. The Faraday cups are designed to minimize the secondary electron emission effects on their response. Angular distribution of the ions is measured, and the results indicate a highly anisotropic emission with a dip at the device axis and a local maximum at the angle of 7 with respect to the axis. It has been argued that this kind of anisotropic emission may be related to the surfatron acceleration mechanism and shown that this behavior is independent of the working gas pressure. It has been also demonstrated that this mechanism is responsible for the generation of MeV ions. Measuring the total ion number at different working gas pressures gives an optimum pressure of 0.3 Torr. In addition, the energy spectrum of ions is measured by taking into account of the ambient gas effects on the energy and charge of the ions. The current neutralization effect of electrons trapped in the ion beam as well as the effect of conducting boundaries surrounding the beam, on the detected signals are investigated. V C 2015 AIP Publishing LLC. [http://dx.

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Angular Distribution of Argon Ions and X-Ray Emissions in the Apf Plasma Focus Device

Cited by 21 publications

References 26 publications

Ion beam and neutron output from a sub-kilojoule dense plasma focus

Ion beam and neutron output from a sub-kilojoule dense plasma focus

Breakthrough in 4π ion emission mechanism understanding in plasma focus devices

Angular distribution of energetic argon ions emitted by a 90 kJ Filippov-type plasma focus

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