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The injection of pellets into JET sometimes leaves a resonant localised structure commonly known as a snake. This paper analyses this localised and persistent density concentration in JET after a pellet injection. The formation is attributed to the growth of a magnetic island at the q = 1 surface, driven by the localised cooling. The island traps some of the ionised pellet material, but the long life of the density perturbation cannot be explained by this initial trapping. As well as analysing the formation of the snake, this paper explains how the magnetic island sustains itself and why snakes do not occur spontaneously.

Additional information

Authors: WESSON J, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(95)41 EN (1995) 10 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199511331 / Last updated on: 1995-10-31
Original language: en
Available languages: en
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