Shape evolution of surface molten by electron beam during cooling stage

•The tungsten surface shape melted by electron beam was measured after solidification.•The surface waves during cooling stage were studied taking into account viscosity.•The amplitudes of perturbation in the beginning of the cooling stage were estimated. A number of experimental studies of melt moti...

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Bibliographic Details
Published in:	Fusion engineering and design Vol. 128; pp. 154 - 157
Main Authors:	Arakcheev, A.S., Chernoshtanov, I.S., Popov, V.A., Shoshin, A.A., Skovorodin, D.I., Vasilyev, A.A., Vyacheslavov, L.N., Bataev, I.A., Bataev, V.A.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 01-03-2018 Elsevier Science Ltd
Subjects:	Beta rays Capillary waves Divertor Ejection Electron beams Electrons Evolution Fusion Melt motion Plasma Pulsed heat load Solidification Tungsten Melt motion Pulsed heat load Tungsten Divertor
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Summary:	•The tungsten surface shape melted by electron beam was measured after solidification.•The surface waves during cooling stage were studied taking into account viscosity.•The amplitudes of perturbation in the beginning of the cooling stage were estimated. A number of experimental studies of melt motion and droplet ejection caused by pulsed plasma load include the measurements of the shape of surface after the solidification of target. The measured shape may be different from the one during the heating stage because of melt motion. In present paper the evolution of this perturbations is treated as capillary waves on the melt surface. The dispersion relation for capillary waves taking into account viscosity and limited depth of liquid was used. The numerical estimations for the melt surface behavior are done for tungsten samples irradiated at BETA facility.
ISSN:	0920-3796 1873-7196
DOI:	10.1016/j.fusengdes.2018.01.027