Comparison of scrape-off layer behaviour between DIV-I and DIV-II operations on ASDEX-Upgrade
The divertor geometry on ASDEX-Upgrade has changed from an open to a more closed configuration. The effects of this change on midplane scrape-off layer profiles for temperature and density are discussed. Investigations concerning the accuracy of separatrix positions are described. The relation between neutral gas flux density in the divertor and midplane density is analysed and scalings are presented. No decrease in the maximum achievable density in the H-mode with the new closed divertor in comparison tot he former open one has been found. For comparable discharges the scrape-off layer density for the closed divertor has been found to be higher or at least as high as for the open divertor.
Bibliographic Reference: Article: Journal of Nuclear Materials, 266-269 (1999), 934-939
Record Number: 199910768 / Last updated on: 1999-05-21
Original language: en
Available languages: en