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Article

Material Erosion and Dust Formation during Tungsten Exposure to Hollow-Cathode and Microjet Discharges

1
National Institute for Lasers, Plasma and Radiation Physics, P.O. Box M G-36, 077125 Magurele, Romania
2
Université Paris-Saclay, CEA, INRAE, DMTS, SCBM, F-91191 Gif-sur-Yvette, France
3
Faculty of Physics, University of Bucharest, 405 Atomistilor Street, 77125 Magurele, Romania
4
CEA, IRFM, F-13108 St Paul Lez Durance, France
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(19), 6870; https://doi.org/10.3390/app10196870
Received: 4 August 2020 / Revised: 7 September 2020 / Accepted: 15 September 2020 / Published: 30 September 2020
(This article belongs to the Special Issue Recent Developments in Fusion Plasma Diagnostics)
Tungsten erosion and dust occurrence are phenomena of great interest for fusion technology. Herein, we report results concerning the material damage and dust formation in the presence of high temperature and large area or concentrated discharges in helium and argon. In order to generate adequate plasmas, we used tungsten electrodes in two experimental discharge systems, namely a hollow discharge and a microjet discharge. In both exposure cases, we noticed surface modification, which was assigned to sputtering, melting, and vaporization processes, and a significant dust presence. We report the formation on electrode surfaces of tungsten fuzz, nano-cones, nanofibers, and cauliflower- and faced-like particles, depending on the discharge and gas type. Dust with various morphologies and sizes was collected and analyzed with respect to the morphology, size distribution, and chemical composition. We noticed, with respect to erosion and particle formation, common behaviors of W in both laboratory and fusion facilities experiments. View Full-Text
Keywords: plasma-tungsten surface interactions; nanostructures; tungsten particles; low and atmospheric pressure plasmas plasma-tungsten surface interactions; nanostructures; tungsten particles; low and atmospheric pressure plasmas
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MDPI and ACS Style

Marascu, V.; Stancu, C.; Satulu, V.; Bonciu, A.; Grisolia, C.; Dinescu, G. Material Erosion and Dust Formation during Tungsten Exposure to Hollow-Cathode and Microjet Discharges. Appl. Sci. 2020, 10, 6870. https://doi.org/10.3390/app10196870

AMA Style

Marascu V, Stancu C, Satulu V, Bonciu A, Grisolia C, Dinescu G. Material Erosion and Dust Formation during Tungsten Exposure to Hollow-Cathode and Microjet Discharges. Applied Sciences. 2020; 10(19):6870. https://doi.org/10.3390/app10196870

Chicago/Turabian Style

Marascu, Valentina, Cristian Stancu, Veronica Satulu, Anca Bonciu, Christian Grisolia, and Gheorghe Dinescu. 2020. "Material Erosion and Dust Formation during Tungsten Exposure to Hollow-Cathode and Microjet Discharges" Applied Sciences 10, no. 19: 6870. https://doi.org/10.3390/app10196870

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