Abstract
The influence of a plasma producing nonstationary thermal loads akin to edge-localized modes in a tokamak on different types of tungsten is investigated. Tungsten is irradiated by a jet of a hydrogen plasma generated in a plasma gun. The plasma density and velocity are on the order of 1022 m−3 and 100–200 km/s, respectively, and the irradiation time is 10 μs. Two plasma flux densities, 0.70 and 0.25 MJ/m2, are used. Structural modifications in irradiated single-crystal and hot-rolled tungsten samples, as well as in V-MP and ITER_D_2EDZJ4 tungsten powders, are examined. It is found that the plasma generates a regular crack network with a period of about 1 mm on the surface of the single-crystal, hot-rolled, and V-MP powder samples, while the surface of the ITER_D_2EDZJ4 powder is more cracking-resistant. The depth of the molten layer equals 1–3 μm, and the extension of intense thermal action is 15–20 μm. The material acquires a distinct regular structure with a typical grain size of less than 1 μm. X-ray diffraction analysis shows that irradiation changes the crystal lattice parameters because of the melting and crystallization of the surface layer. The examination of the V_MP tungsten powder after cyclic irradiation by a plasma with different energy densities shows that high-energy-density irradiation causes the most significant surface damage, whereas low-energy-density irradiation generates defects that are small in size even if the number of cycles is large.
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References
G. F. Matthews, et al., Phys. Scr. 138, 14030 (2009).
G. F. Matthews, et al., J. Nucl. Mater. 390–391, 934 (2009).
O. Gruber, et al., Nucl. Fusion 49, 115014 (2009).
K. Sugiyama, et al., Nucl. Fusion 50, 35001 (2010).
A. Shoshin, et al., Fusion Sci. Technol. 59, 57 (2011).
T. Hirai, et al., JUDITH. http://www-pub.iaea.org/MTCD/Meetings/PDFplus/fusion-20-preprints/FT_P1-20.pdf
G. De Temmerman, et al., Nucl. Fusion 51 (2011).
I. E. Garkusha, I. Landman, J. Linke, V. A. Makhlaj, A. V. Medvedev, S. V. Malykhin, S. Peschanyi, G. Pintsuk, A. T. Pugachev, and V. I. Tereshin, J. Nucl. Mater. 415, S65 (2011).
V. M. Safronov, et al., Probl. At. Sci. Technol., Ser.: Plasma Phys. (16), No. 6, 51 (2010).
R. A. Pitts, “ITER divertor strategies: physics basis”, in Proceedings of the Strategy Workshop, Cadarache, 2011.
A. V. Voronin, et al., Nukleonika 53, 103 (2008).
A. V. Voronin, V. K. Gusev, Ya. A. Gerasimenko, and Yu. V. Sud’enkov, Tech. Phys. 58, 1122 (2013).
A. V. Voronin, A. V. Ankudinov, V. K. Gusev, Ya. A. Gerasimenko, A. N. Demina, A. N. Novokhatsky, Yu. V. Petrov, N. V. Sakharov, and Yu. V. Sudenkov, in Proceedings of the 39th European Physical Society Conference on Plasma Physics, Stockholm, Sweden, 2012, P4.080. http://ocs.ciemat.es/epsicpp2012pap/pdf/P4.080.pdf
E. V. Demina, V. A. Gribkov, V. N. Pimenov, S. A. Maslyaev, M. D. Prusakova, V. Shirokova, T. Laas, and Yu. Ugaste, Fiz. Khim. Obrab. Mater., No. 3, 15 (2013).
E. M. Savitskii, K. B. Povarova, and P. V. Makarov, Physical Metallurgy of Tungsten (Metallurgiya, Moscow, 1978).
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Original Russian Text © A.V. Ankudinov, A.V. Voronin, V.K. Gusev, Ya.A. Gerasimenko, E.V. Demina, M.D. Prusakova, Yu.V. Sud’enkov, 2014, published in Zhurnal Tekhnicheskoi Fiziki, 2014, Vol. 84, No. 3, pp. 36–43.
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Ankudinov, A.V., Voronin, A.V., Gusev, V.K. et al. Influence of a plasma jet on different types of tungsten. Tech. Phys. 59, 346–352 (2014). https://doi.org/10.1134/S1063784214030025
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DOI: https://doi.org/10.1134/S1063784214030025