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As a result of plasma-wall contact during hard disruptions, intense vaporization of the divertor plates is initiated. The evolving vapour layer intercepts a fraction of the incident energy carriers, thus shielding the plates. The plasma particles of different energies and masses moving along the skewed magnetic field lines penetrate the vapour layer to different depths, thus causing charge separation there and the onset of an electrostatic field. It is shown in a one dimensional approximation that, owing to the constraints imposed on the electric field and on the current components at the plate surface, a rather intense lateral drift motion of the vapour evolves in the scrape-off layer (SOL). The analysis shows that drift velocities of the order of between 1E3 ms{-1} and 1E4 ms{-1} are to be expected, which may notably impair the shielding characteristics of the vapour layers and increase the erosion rates of the divertor plates.

Additional information

Authors: LENGYEL L L, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);ROZHANSKIJ V A, St Petersburg State Technical University (RU);VESELOVA I Y, St Petersburg State Technical University (RU);LALOUSIS P J, Foundation for Research and Technology, Insitute of Electronic Structure and Laser-HELLAS, Heraklion (GR)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 37 (1997) No. 9, pp. 1245-1253
Record Number: 199711630 / Last updated on: 1997-12-09
Original language: en
Available languages: en