UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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Conference: Bucharest University Faculty of Physics 2011 Meeting


Section: Optics, Spectroscopy, Plasma and Lasers


Title:
Carbon cleaning from surfaces by an atmospheric pressure plasma jet: importance of gas nature and surface temperature


Authors:
C. Stancu (1), A. Kiss(2), G. Dinescu(1)


Affiliation:
Institute for Laser, Plasma and Radiation Physics, Low Temperature Plasma Physics Department, Atomistilor 409 Magurele, PO Box Mg36, Bucharest, 077125 Romania (1)

National Institute for Optoelectronics, Magurele, Bucharest, 077125, POB MG-5, Romania (2)


E-mail
cristian.stancu@infim.ro


Keywords:
plasma cleaning, atmospheric pressure plasma jet, removal of carbon


Abstract:
One of the most difficult problems in long term operation of fusion machines is the co-deposition of tritium with eroded carbon on the walls. The removal of tritiated codeposited layers has been attempted with various techniques, like laser ablation, thermal oxidation, and electrical discharges. In this contribution we present a technique for removal of carbon layers from surfaces by using an atmospheric pressure plasma jet. The plasma jet source at atmospheric pressure and its utilization for carbon cleaning were described in detail elsewhere [1, 2]. In this contribution we report results concerning the dependence of removal efficiency upon gas nature and surface temperature. Cleaning of carbon samples was realized by scanning of their surfaces by the plasma jet in open atmosphere, or in static conditions, exposing a heated carbon sample to the jet. The used gases were argon, argon/oxygen, argon/hydrogen, argon/ammonia, nitrogen and nitrogen/oxygen mixtures. The erosion rate was measured by profilometry and gravimetry. Higher efficiencies were obtained in nitrogen and nitrogen/oxygen mixtures. The erosion rate increases with the increase of surface temperature. [1] E.R. Ionita, I. Luciu, G. Dinescu, C. Grisolia, Fusion Engineering and Design, 82 (2007) 2311–2317 [2] G. Dinescu, E.R. Ionita, Pure and Applied Chemistry, 80, 9 (2008)1919-1930