Deuterium trapping in divertor tiles of ASDEX-Upgrade
The deuterium inventory of divertor target tiles used in ASDEX-Upgrade for up to 2000 discharges has been analyzed by thermodesorption spectrometry, nuclear reaction analysis, electron microscopy and optical surface profilometry have been applied for investigating erosion and deposition phenomena. The original plasma facing surfaces were graphite and plasma sprayed tungsten, respectively. The total deuterium inventories have been found to vary 4 x 10(21) D-atoms/m(2) and 3 x 10(23) D-atoms/m(2). The deuterium is contained in a deposit on the surface of the graphite and tungsten tiles consisting mainly of carbon , boron and the hydrogen isotopes. There is a strong indication that morphological effects influence impurity deposition, deuterium trapping and re-erosion of the contamination.
Bibliographic Reference: Article: Journal of Nuclear Materials, 266-269 (1999), 532-537
Record Number: 199910762 / Last updated on: 1999-05-21
Original language: en
Available languages: en