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

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

Identyfikatory

DOI

10.1515/nuka-2016-0027

• Konferencja: PLASMA-2015 International Conference on Research and Applications of Plasmas (7-11 September 2015 ; Warsaw, Poland)
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

dense plasma focus (DPF); interferometric diagnostics; organized structures in plasma; plasmoids

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2016
• Tom: Vol. 61, No. 2
• Strony: 155--159
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Cikhardtova B.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

autor

Kubes P.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

autor

Cikhardt J.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

autor

Paduch M.

• Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

autor

Zielinska E.

• Institute of Plasma Physics and Laser Microfusion (IPPLM), 23 Hery Str., 01-497 Warsaw, Poland

autor

Kravarik J.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

autor

Rezac K.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

autor

Kortanek J.

• Faculty of Electrical Engineering, Czech Technical University in Prague (CVUT), Technická 2, 166 27, Prague, Czech Republic, Tel.: [phone], Fax: [phone]

Bibliografia

• 1. Kubes, P., Paduch, M., Cikhardt, J., Kortanek, J., Cikhardtova, B., Rezac, K., Klir, D., Kravarik, J., & Zielinska, E. (2014). Filamentary structure of plasma produced by compression of puffi ng deuterium by deuterium or neon plasma sheath on plasma-focus discharge. Phys. Plasmas, 21, 122706.
• 2. Kubes, P., Paduch, M., Cikhardt, J., Kortanek, J., Batobolotova, B., Rezac, K., Klir, D., Kravarik, J., Surala, W., Zielinska, E., Scholz, M., Karpinski, L., & Sadowski, M. J. (2014). Neutron production from puffing deuterium in plasma focus device. Phys. Plasmas, 21, 082706.
• 3. Zielinska, E., Paduch, M., & Scholz, M. (2011). Sixteen-frame interferometer for a study of a pinch dynamics in PF-1000 device. Contrib. Plasma Phys., 51(2/3), 279–283.
• 4. Ryutov, D. D. (2015). Characterizing the plasmas of dense Z-pinches. IEEE Trans. Plasma Sci., 43(8), 2363–2384.
• 5. Kubes, P., Klir, D., Kravarik, J., Rezac, K., Kortanek, J., Krauz, V., Mitrofanov, K., Paduch, M., Scholz, M., Pisarczyk, T., Chodukowski, T., Kalinowska, Z., Karpinski, L., & Zielinska, E. (2013). Scenario of pinch evolution in a plasma focus discharge. Plasma Phys. Control. Fusion, 55, 035011.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.