A scrape-off layer based density limit for JET ELMy H-modes
During a density ramp-up The Joint European Torus (JET) ELMy H-modes typically show a saturation of the core density which may even be followed by a decrease (density limit). At the limit the discharge detaches between edge localized modes (ELM) and a recently proposed edge based detachment limit for the separatrix density applies. In this paper a simple picture is proposed for the relation between separatrix and core density which allows us to derive the corresponding limit for the core density. The empirical evidence from JET is discussed and compared with the model predictions. It is shown that the resulting limit for the line averaged density coincides in size and scaling with the empirical Greenwald limit.
Bibliographic Reference: Report: IPP 5/75 EN (1997) 6pp.
Availability: Available from the Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199810020 / Last updated on: 1998-02-03
Original language: en
Available languages: en