Ion beam micro analysis of deposits at tokamak divertor surfaces

✍ Scribed by P. Petersson; H. Bergsåker; G. Possnert; J.P. Coad; S. Koivuranta; J. Likonen

• Book ID: 103863858
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 711 KB
• Volume: 268
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2010.02.025

✦ Synopsis

Cross sections of deposited layers in the Joint European Torus (JET) were analysed using the nuclear micro analysis at the Tandem Laboratory, Uppsala University. For deuterium and beryllium the nuclear reactions 2 D( 3 He,p) 4 He and 9 Be( 3 He,p n ) 11 B were exploited for analysis. Typically the analyses have been made with 10 lm spatial resolution and a sensitivity of better than one atomic percent for beryllium or deuterium in carbon matrix. Comparing several different surface treatment techniques shows that polishing the sample surface give very good optical surface information but that some amount of deuterium and beryllium probably is removed. For good quantitative results the measurement can either be done on a rough surface or the top of the polished surface can be cut off.