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W7-AS has recently been equipped with ten open diverter modules in order to experimentally evaluate this exhaust concept in view of future application to W7-X. The new diverter enables access to a new NBI-heated, very high density (up to n(e) = 3.5x10{20}m{-3}) operating regime with promising confinement properties. The energy confinement time increases steeply with density. In contrast, the particle and impurity confinement times decrease with increasing density. This allows full density control and stable quasi steady-state operation also under conditions of partial detachment from the diverter targets. Radiated power fractions are low to moderate in attached regimes and reach up to about 90% in detachment scenarios. The radiation mainly originates from lower ionization states of carbon and oxygen and stays always peaked at the edge.

Additional information

Authors: GRIGULL P ET AL, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE)
Bibliographic Reference: An article published in: Journal of Plasma and Fusion Research, Vol 5 (2002) 118-123
Availability: Website of journal publishers:
Record Number: 200316361 / Last updated on: 2003-06-20
Original language: en
Available languages: en