Ion emission from plasma-focus facilities

Sadowski, M.; Zebrowski, J.; Rydygier, E.; Kucinski, J.

doi:10.1088/0741-3335/30/6/008

Cited by 74 publications

(54 citation statements)

References 6 publications

(1 reference statement)

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“…In fact, some portion of the deuterons, which are accelerated by different processes occurring during PF discharges, is lost within the nuclear fusion reactions mainly inside the dense plasma pinch. Another portion of the fast deuterons can, however, escape from the PF pinch region and be recorded within a hemisphere in front of the electrode outlet, as observed in many experiments [5,6,7]. In order to explain angular distributions of the fast deuterons escaping from the pinch, different models of the pinch structure were considered and the computer modelling of deuterons motions was performed.…”

Section: Role Of the Current Filamentsmentioning

confidence: 99%

Formation and role of filaments in high-current discharges of the pinch type

Sadowski

Malinowska

2006

Czech J Phys

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The paper concerns distinct current filaments which appear inside plasma layers and columns produced by high-current pulse discharges of the Z-pinch and Plasma-Focus (PF) type. Results obtained previously, e. g. pictures taken with high-speed cameras, soft X-ray pinhole images, measurements of angular distributions of fast deuterons, images of so-called hot-spots inside the pinch column etc., have been reviewed and explained on the basis of the filamentary model. For the first time results of the measurements of fusion-produced protons, which were performed at different azimuthal angles (around the pinch column), have been presented. These results constitute a new experimental evidence of the appearance and role of the current filaments in pinch-type discharges.

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Section: Role Of the Current Filamentsmentioning

confidence: 99%

Formation and role of filaments in high-current discharges of the pinch type

Sadowski

Malinowska

2006

Czech J Phys

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“…Studies of the fast ion emission from various Plasma--Focus (PF) facilities were performed in many laboratories all over the world, and their results were published in numerous papers which can be found as references in some review papers [1][2][3][4][5]. Such studies have also been carried out within different PF-type facilities in Poland [6][7][8][9][10][11][12][13][14][15]. It should be noted, however, that almost all PF devices mentioned above were operated at static initial gas conditions, and only a few of the PF-experiments were performed with an additional gas-puffing [16,17].…”

Section: Introductionmentioning

confidence: 99%

Recent ion measurements within the modified DPF-1000U facility

et al. 2015

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Abstract. In this note we describe measurements of ion beams emitted along the z-axis of the DPF-1000U facility operated at 23 kV, 334 kJ, and with the initial deuterium pressure of 1.6-2 hPa. The DPF-1000U device was recently renewed and equipped with a dynamic gas-puff valve placed inside the inner electrode. The investigated ions were recorded by means of ion pinhole cameras equipped with solid state nuclear track detectors of the PM-355 ® (PADC) type. The energy spectra of ions were determined using a Thomson spectrometer placed on the symmetry axis at a distance of 160 cm from the electrodes outlets. The ion images recorded during discharges performed under different experimental conditions show that the ion beams have a complex structure, usually in the form of a central bunch and an annular stream composed of many micro-beams. Energies of the registered deuterons have been in the range of 30-700 keV, while the fast protons (which originated from the hydrogen remnants) had energies in the range of 300-850 keV.

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“…Several theoretical papers were devoted to the influence of highenergy ions and electrons on neutron and X-ray emissions. Although ion beams have been studied experimentally for many years [2], the knowledge about sources and mechanisms of their acceleration is still insufficient. In the theoretical papers [3,4,5], simple configurations have been adopted to describe the ion behaviour inside and in the vicinity of a plasma column [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

3D modelling of ion motion within dynamic filamentary PF-pinch column

2000

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The paper reports on the results of a 3-D modelling of ion motion within the plasma focus (PF) pinch column, which is treated as a filamentary, non-stationary system. Besides magnetic fields, also the induced electrical fields as well as the ion-ion and ion-electron collisions have been included in the equations of ion (deuteron) motion. The results obtained show that the filamentary structure influences the 3-D ion trajectories and 2-D angular distribution of ions. It has been confirmed that 3-D flower-like filaments can explain some important characteristics of the ion emission from PF discharges.

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Ion emission from plasma-focus facilities

Cited by 74 publications

References 6 publications

Formation and role of filaments in high-current discharges of the pinch type

Formation and role of filaments in high-current discharges of the pinch type

Recent ion measurements within the modified DPF-1000U facility

3D modelling of ion motion within dynamic filamentary PF-pinch column

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