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A simple fluid model is used to interpret two edge flow phenomena that are observed in the scrape-off layer of the Tore Supra tokamak. (1) The Mach number of the parallel flow midway between the two sides of the toroidal limiter is always a significant fraction of the ion sound speed, typically Mk = -0.3 / -0.6, directed towards the high field side. In Tore Supra the ExB drift is relatively unimportant, so the existence of a large parallel flow implies a significant poloidal asymmetry of the SOL source. (2) Massive injection of neutral gas leads to a recycling source that is poloidally localized near the nozzle.
The parallel Mach number changes during injection. The sign of the change is positive for injection on the high field side, and negative for injection on the low field side. The ionization source that is needed to produce the change is about 5 / 10 % of the total amount of injected gas, consistent with atomic physics calculations.

Additional information

Authors: GUNN J P, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Czechoslovak Journal of Physics, Vol. 54 , p. C135-142, suppl. C
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