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Abstract

With a so-called sniffer probe the fraction of the hydrogen during discharges with deuterium NBI heating was studied in the plasma edge of the stellarator W7-AS. As expected, the ratios were significantly lower than in discharges with hydrogen NBI heating but were higher than those in discharges with only ECRH. An examination of the possible reasons for this increase concludes that it is not only partially caused by the direct influence of neutral injection but also depends on the energy content of the plasma determined by the heating power and the confinement time. Of course, the isotope ratio also depends on the starting conditions, i.e. the isotope ratio before the onset of NBI.

Additional information

Authors: ZEBISCH P, International Atomic Energy Agency, Vienna (AT);TAGLAUER E, International Atomic Energy Agency, Vienna (AT);W7-AS TEAM, International Atomic Energy Agency, Vienna (AT);NBI TEAM, International Atomic Energy Agency, Vienna (AT)
Bibliographic Reference: Article: Nuclear Fusion, 39 (1999) 4, 451-457
Record Number: 199910800 / Last updated on: 1999-06-07
Category: PUBLICATION
Original language: en
Available languages: en