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[en] Experimental results of discharge cleaning of carbon deposits are presented. Deposits were prepared by creating plasma in pure methane. The methane was cracked in RF discharge at the output power of 250 W. The resultant radicals were bonded to the wall of discharge vessel forming a thin film of hydrogenated black carbon with the thickness of about 200nm. The film was then cleaned in situ by oxygen plasma with the density of about 1x1016 m-3, electron temperature of 5 eV, neutral gas kinetic temperature of about 1000C and neutral atom density of 6x1021 m-3. The treatment time was 30 minutes. The efficiency of plasma cleaning was monitored by optical emission spectroscopy. As long as the wall was contaminated with carbon deposit, substantial emission of the CO molecules was detected. As the cleaning was in progress, the CO emission was decreasing and vanished after 30 minutes when the discharge vessel became free of any carbon. The results are explained by interaction of plasma radicals with carbon deposits. (author)
Source
Glumac, B.; Lengar, I. (Nuclear Society of Slovenia (Slovenia)) (eds.); Nuclear Society of Slovenia, Ljubljana (Slovenia). Funding organisation: Slovenian Research Agency, Ljubljana (Slovenia); Agency for Radwaste Management, Ljubljana (Slovenia); Westinghouse Electric Europe, Brussels (Belgium); NUMIP Engineering, Construction, Maintenance and Production, Ljubljana (Slovenia); Inst. of Metals and Technology, Ljubljana (Slovenia); Elmont, Krsko (Slovenia); Pool for Insurance and Reinsurance of Nuclear Risk, Ljubljana (Slovenia); GEN energija, Krsko (Slovenia); AREVA, Framatome ANP, Paris (France); Enertech, Brea, CA (United States); QTechna, Ljubljana (Slovenia); INETEC-Inst. for Nuclear Technology, Zagreb (Croatia); vp; ISBN 961-6207-26-3; 
; 2006; [5 p.]; International Conference Nuclear Energy for New Europe 2006; Portoroz (Slovenia); 18-21 Sep 2006; PROJECT FU06-CT-2004-00083; PROJECT 3211-05-000017; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 4 refs., 5 figs.
; 2006; [5 p.]; International Conference Nuclear Energy for New Europe 2006; Portoroz (Slovenia); 18-21 Sep 2006; PROJECT FU06-CT-2004-00083; PROJECT 3211-05-000017; Also available from Slovenian Nuclear Safety Administration, Zelezna cesta 16, Ljubljana (SI) or Nuclear Society of Slovenia, Jamova 39, Ljubljana (SI); 4 refs., 5 figs.