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Abstract

Joint European Torus (JET) high-density discharges, when approaching detachment, typically show a gradual drop of the ion saturation current J(sat) (rollover), an increase of the D(alpha) signal and an increase of the divertor neutral density as the main plasma density is ramped up, even in cases with constant net input power. This has been found difficult to explain by ion-neutral collisions alone. This problem has been studied with a view to the potential role of volume recombination using the B2-Eirene scrap-off layer simulation code package. The main conclusion is that volume recombination indeed plays a role in the parameter range under consideration and is essential to explain the experimental findings.

Additional information

Authors: BORASS K, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);COSTER D, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SCHNEIDER R, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);REITER D, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 241-243 (1997) pp. 250-254
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