Damages of Carbon-Tungsten Samples under Influence of Deuterium Ions and Dense Plasma Streams within Plasma-Focus Facility
- A.I. Alikhanov Institute of Theoretical and Experimental Physics, 117218 Moscow (Russian Federation)
- A.A. Baykov Institute of Metallurgy and Material Science, 119991 Moscow (Russian Federation)
- A. Soltan Institute for Nuclear Studies, 05-400 Otwock-Swierk n. Warsaw (Poland)
- Institute of Plasma Physics and Laser Microfusion, 23 Hery St. 00-908 Warsaw (Poland)
The paper reports on experimental studies of processes of the interaction of pulsed streams of fast deuterium ions (E{sub i}{approx}100 keV) and dense deuterium plasma (v{sub pl}>10{sup 7} cm/s) with samples made of carbon and tungsten. Experiments were performed in the large PF-1000 plasma-focus facility with the charging energy of 481 kJ and with the pure deuterium filling. Power flux density of plasma/ions streams was q = 10{sup 7}-10{sup 10} W/cm{sup 2} and the pulse length was from 10{sup -7} s to 10{sup -6} s, whereas the duration of heat pulses (due to a secondary plasma at the target's surface) was 10{sup -4} s. The stainless steel, tungsten and carbon-tungsten samples were placed in the zone of their strong melting and evaporation or in the zone without their melting. Each sample was exposed to 1 through 10 discharges, and the irradiated samples were investigated with optical-, electron- and atomic-force-microscopes. The interaction of intense plasma-ion pulses with the carbon-tungsten samples caused the formation of a wave-like relief on sample surfaces, the evident erosion of the sample material, and the creation of numerous micro-cracks. It was also found that about 200-nm-thick layer of the irradiated tungsten sample contained many melted fragments of nm-dimensions. The results might be useful for estimations of tungsten behavior in extreme situations (e.g. disruptions) expected in fusion reactors with magnetic plasma confinement.
- OSTI ID:
- 21136945
- Journal Information:
- AIP Conference Proceedings, Vol. 993, Issue 1; Conference: PLASMA 2007: International conference on research and applications of plasmas; 4. German-Polish conference on plasma diagnostics for fusion and applications; 6. French-Polish seminar on thermal plasma in space and laboratory, Greifswald (Germany), 16-19 Oct 2007; Other Information: DOI: 10.1063/1.2909149; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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