This paper presents results of experimental studies of tungsten samples of 99.95% purity, which were irradiated by intense plasma-ion streams. The behaviour of tungsten, and particularly its structural change induced by high plasma loads, is of great importance for fusion technology. The reported measurements were performed within a modified PF-1000U plasma-focus facility operated at the IFPiLM in Warsaw, Poland. The working gas was pure deuterium. In order to determine the main plasma parameters and to study the behaviour of impurities at different instants of the plasma discharge, the optical emission spectroscopy was used. The dependence of plasma parameters on the initial charging voltage (16, 19 and 21 kV) was studied. Detailed optical measurements were performed during interactions of a plasma stream with the tungsten samples placed at the z-axis of the facility, at a distance of 6 cm from the electrode outlets. The recorded spectra showed distinct WI and WII spectral lines. Investigation of a target surface morphology, after its irradiation by intense plasma streams, was performed by means of an optical microscope. The observations revealed that some amounts of the electrodes material (mainly copper) were deposited upon the irradiated sample surface. In all the cases, melted zones were observed upon the irradiated target surface, and in experiments performed at the highest charging voltage there were formed some cracks.
If the inline PDF is not rendering correctly, you can download the PDF file here.
1. Pitts R. A. Carpentier S. Escourbiac F. Hirai T. Komarov V. Lisgo S. Kukushkin A. S. Loarte A. Merola M. Sashala Naik A. Mitteau R. Sugihara M. Bazylev B. & Stangeby P. C. (2013). A full tungsten divertor for ITER: Physics issues and design status. J. Nucl. Mater. 438 S48-S56. DOI: 10.1016/j. jnucmat.2013.01.008.
2. Kubkowska M. Skladnik-Sadowska E. Kwiatkowski R. Malinowski K. Kowalska-Strzęciwilk E. Paduch M. Sadowski M. J. Pisarczyk T. Chodukowski T. Kalinowska Z. Zielinska E. & Scholz M. (2014). Investigation of interactions of intense plasma streams with tungsten and carbon fibre composite targets in the PF-1000 facility. Phys. Scr. T161 014038. DOI: 10.1088/0031-8949/2014/ T161/014038.
3. Scholz M. Drozdowicz K. Karpinski L. Krauz V. Kubes P. Paduch M. Pisarczyk T. Sadowski M. J. Woznicka U. Zielinska E. Czaus K. Malinowski K. Skladnik-Sadowska E. & Zebrowski J. (2013). Status of Plasma-Focus research in Poland. In Proceedings International Conference PLASMA-2013 Warsaw Poland 2-6 September 2013. (Tutorial lecture T10).
4. Skladnik-Sadowska E. Kwiatkowski R. Malinowski K. Sadowski M. J. Gribkov V. A. Kubkowska M. Paduch M. Scholz M. Zielinska E. Demina E. V. Maslyaev S. A. & Pimenov V. N. (2014). Research on interactions of intense plasma-ion streams with a SiC target in a modified PF-1000 facility. Phys. Scr. T161 014039. DOI: 10.1088/0031-8949/2014/ T161/0140039.
5. Zaloga D. R. Skladnik-Sadowska E. Kubkowska M. Ladygina M. S. Malinowski K. Kwiatkowski R. Sadowski M. J. Paduch M. Zielinska E. & Makhlaj V. A. (2015). Comparison of optical spectra recorded during DPF-1000U plasma experiments with gas-puffing. Nukleonika 60(2) 309-314. DOI: 10.1515/nuka-2015-0058.
6. Skladnik-Sadowska E. Malinowski K. Sadowski M. J. Wolowski J. Gasior P. Kubkowska M. Rosinski M. Marchenko A. K. & Sartowska B. (2009). Spectroscopy of the tungsten plasma produced by pulsed plasma-ion streams or laser beams. J. Nucl. Mater. 390/391 847-851. DOI: 10.1016/j. jnucmat.2009.01.223.