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Application of some carbon-aluminium based nanostructures obtained by TVA method in divertors coating from fusion reactor

Ş.G.TUTUN1,* , L. PETRĂŞESCU1, R. VLĂDOIU2, G. PRODAN2, P. POROŞNICU3, E. VASILE4, I. PRIOTEASA1, R. MANU1, V. CIUPINĂ2,5

Affiliation

  1. Faculty of Physics, University of Bucharest, Atomiştilor 405, Măgurele, Ilfov
  2. Ovidius University of Constanta, Mamaia 124, Constanţa, 900527, Romania
  3. National Institute for Laser, Plasma and Radiation Physics, PO Box MG-36, 077125, Bucharest, Romania
  4. University Politehnica of Bucharest, No. 1-7 Gh. Polizu Street, Bucharest 011061, Romania
  5. Academy of Romanian Scientists, Independenţei 54, Bucharest 050094, Romania

Abstract

Nanostrctured carbon materials have increasingly attracted the interest of the scientific community, because of their physical properties and potential application in high-tech devices. In the current ITER design, the tiles made of carbon fiber composites (CFCs) are forseen for the strike point zone and tungsten (W) for other parts of the divertor region. This choice is a compromise based mainly on experience with individual materials in many different tokamaks. Also C-Al composites are the candidate material for this first Wall in ITER. In order to prepare nanostructured carbon based nanocomposite for the divertor part in fusion application, the Thermionic Vaccum Arc (TVA) method was used in two electronic gun configuration. One of the main advantages of this technology is the bombardment of the growing thin film just by the ions of the depositing material. Even more, the energy of ions can be controlled. Thermo-electrons emitted by an externally heated cathode and focused by a Wehnelt focusing cylinder are strongly accelerated towards the anode whose material is evaporated and bright plasma is ignited by a high voltage DC supply.The nanostructured amorphous C-Al samples were characterized by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDXS) and magnetoresistance analysis. The carbon based nanostructures were identified by TEM and SEM as having an uniform morphology and amorphous structure. The EDXS method confirms the presence of the C, Al and Si in the samples. The electric mesurements shows the resistance differences in the analyzed samples and that ,in conclusion, the Al concentration and the type of the surface have a matter in the electric resistance effect. Also, in the presence of a magnetic field of 0.3T all the thin films that were investigated showed a slight drop in resistance..

Keywords

divertor, C-Al, TVA, TEM, Electron diffraction, SEM, EDXS, Magnetoresistance, coating.

Submitted at: Dec. 10, 2014
Accepted at: June 24, 2015

Citation

Ş.G.TUTUN, L. PETRĂŞESCU, R. VLĂDOIU, G. PRODAN, P. POROŞNICU, E. VASILE, I. PRIOTEASA, R. MANU, V. CIUPINĂ, Application of some carbon-aluminium based nanostructures obtained by TVA method in divertors coating from fusion reactor, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 7-8, pp. 1064-1069 (2015)