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Conference: Bucharest University Faculty of Physics 2015 Meeting

Section: Optics, Spectroscopy, Plasma and Lasers

Title:

Particles processing for controlled fusion research by plasma methods

Authors:

Valentina MARASCU(1,2), Andrada LAZEA-STOYANOVA(2), Cristian STANCU(2), Emil Stefan BARNA(1), Gheorghe DINESCU(1,2)

Affiliation:

1) Faculty of Physics, University of Bucharest, 405 Atomistilor, 077125 Bucharest- Magurele, Romania

2) National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, 077125 Bucharest– Magurele, Romania

E-mail

valentina.marascu@gmail.com

Keywords:

metallic particles, atmospheric plasma jet, tungsten, aluminium, fusion technology

Abstract:

Synthesis and characterization of metallic particles, like wolfram and beryllium, represent an important step in studying dust formation in International Thermonuclear Experimental Reactor (ITER). By using an atmospheric pressure plasma, we obtained previously copper metallic particles [1]. Here, nano and micro particles were obtained with the atmospheric pressure plasma jet from aluminium (chosen as surrogate for beryllium whose powder is toxic) and wolfram materials. The experimental setup, to obtain aluminium particles, imply a non-thermal atmospheric pressure plasma jet source, with the powered RF electrode from aluminium and working at: 1000 - 2000 sccm argon, 50 - 100 W radiofrequency (RF) power and 40 - 60 min plasma exposure time. Moreover, wolfram particles were obtained, also, by using an atmospheric pressure plasma and wolfram electrode, with the following parameters: 1000 sccm argon, 100-250 W radiofrequency (RF) power ad 40- 60 plasma exposure time. These particles were collected on Ni and Si substrates. From Scanning Electron Microscopy, it was found that the particles dimension depend on gas flow, RF power and exposure time. Optical Emission Spectroscopy diagnostic showed the presence of aluminum or tungsten lines in plasma while EDAX Mapping showed the elemental composition of the particles. To explain the particle formation the electrode was examined. It was found that the discharge produces a local melting, on the electrode surface, for both aluminium and wolfram materials, the melted and evaporated material forming particles on the way from electrode to substrate.

References:

[1] A. Lazea-Stoyanova, A. Vlad, A. M. Vlaicu, V. S. Teodorescu, G. Dinescu, Synthesis of copper particles by non-thermal atmospheric pressure plasma jet, Plasma Processes and Polymers, DOI: 10.1002/ppap.201 400 197.

Acknowledgement:

V. Mărăscu acknowledge the support in the frame of the project 1-EU12 WPEDU-RO, "EUROfusion Consortium contribution to education in fusion research at the predoctoral and PhD level", Joint Research Unit - Institute for Atomic Physics, Romania.