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During the W7-AS stellarator operation period in autumn 1995 sniffer probe measurements were made for more than 800 discharges. The H/D ratio during deuterium discharges was determined showing HD and H(2) desorption from the walls even after fresh boronization. For these discharges the loading of the walls with deuterium could be observed. In the higher mass range the development of large amounts of hydrocarbons was observed at the beginning of the discharges with neutral beam injection. To evaluate the large amount of data recorded here (in the order of 10000 mass spectra), appropriate mathematical methods are required. It is shown that group analysis can be applied to distinguish certain sets of discharges and to derive useful mean values.

Additional information

Authors: ZEBISCH P ET AL, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 241-243 (1997) pp. 919-924
Record Number: 199711628 / Last updated on: 1997-12-09
Original language: en
Available languages: en