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The limitation of ablation on rational surfaces has been shown to be an efficient mechanism of striation formation during pellet ablation. In JET, a very large striation is observed when the pellet crosses the q=1 surface. This paper presents a thorough analysis of the pellet ablation in this region and shows that an extended shearless zone around q=1 is necessary to reproduce the experimental signal. Such a feature is likely to be an essential ingredient in the understanding of internal disruptions.

Additional information

Authors: PEGOURIE B, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);DUBOIS M A, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);GILL R D, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 35090 ORA
Record Number: 199010025 / Last updated on: 1994-12-01
Original language: en
Available languages: en