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Evolution of the small ball-like structures in the plasma focus discharge

Cikhardtova B., Kubes P., Cikhardt J., Paduch M., Zielinska E., Kravarik J., Rezac K., Kortanek J.

Nukleonika

2016

Vol. 61, No. 2

155--159

The experiments were carried out in the PF-1000 plasma-focus device at the maximum current reaching about 2 MA, at the deuterium or neon filling and with deuterium injected from a gas-puff nozzle placed on the axis of the anode face. Ball-like structures of diameters of 1–12 mm were identifi ed in interferometric and XUV pinhole camera frames. We made the statistical description of their parameters. A lifetime of the ball- -like structures was in the range from 30 to 210 ns, and in some cases even more. These structures appeared mostly at the surface of the imploding plasma shell and they did not change their position in relation to the anode end. During the evolution of these structures, interferometric fringes were observed near the surfaces of the structures only, and their internal parts were initially chaotic (without noticeable) fringes. Subsequently the number of interferometric fringes increased (the internal ‘chaotic’ area was fi lled with fringes too) and later on it decreased. The radii of the ball-like structures were mostly increasing during their existence. The maximum electron density reached the value of 1024 to 1025 m–3. The ball-like structures decayed by absorption inside the expanded pinch column and/or gradually expired in rare plasma outside of the dense plasma column.

Interferometry of the plasma focus equipped with forehead cathode

Kubeš P., Klír D., Rezac K., Paduch M., Pisarczyk T., Scholz M., Chodukowski T., Kalinowska Z., Hitschfel J., Kortanek J., Kravárik J., Ivanova-Stanik I., Bienkowska B., Karpinski L., Zielinska E., Sadowski M. J., Tomaszewski K.

Nukleonika

2012

Vol. 57, No. 2

189-192

The PF-1000 plasma-focus facility in Warsaw, equipped with Mather-type coaxial electrodes working with a deuterium filling, was modified by the addition of a cathode disk in front of the anode front-plate at a distance of 3 cm. The plasma was diagnosed with temporal resolved interferometry and neutron diagnostics. The modified electrode configuration showed an increase of the current in the pinch phase and a decrease of the total neutron yield. The lower total neutron yield is caused by a lower energy of deuterons producing the observed neutrons and by a decrease of the velocity of transformations of the structures in the pinch column.