Berlin 2001 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
P: Plasmaphysik
P 12: Plasma Wall Interaction, Diagnostic and Low Temperature Discharges (Poster Session)
P 12.8: Poster
Friday, April 6, 2001, 12:30–15:00, AT2
Deuterium reemission from Ta/W twin limiter exposed in TEXTOR — •T. Hirai1, V. Philipps1, A. Huber1, A. Pospieszczyk1, P. Wienhold1, T. Tanabe2, and M. Wada3 — 1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, 52425, Jülich — 2Center for Integrated Research in Science and Engineering, Nagoya University, Furo-cho, Chigusa-ku, Nagoya 464-8603 Japan — 3Faculty of Engineering and Science, Doshisha University, Kitatanabe, Kyoto 610-03 Japan
High Z elements are preferable materials as plasma facing components in respects of their lower erosion rates and high melting temperatures. In the experiments, tantalum and tungsten twin limiter was exposed to examine their hydrogen recycling properties. The deuterium reemission from each material would be different because of the different behavior for deuterium: tantalum is an exothermic metal and tungsten is an endothermic metal. During the exposure in the scrape off layer, the limiter was observed with spectrometer and 2D-CCD. Spectroscopic results showed that the intensity of Dβ emission from tantalum surface was weaker than that of tungsten. This result is associated with the difference of the deuterium reemission processes.