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Abstract

A large very localised pressure perturbation has been observed in JET, due to the formation of a small region on the q = 1 surface with greatly increased density, which persists for a surprisingly long time. This effect, called the snake, is seen following the injection of D(2) pellets, at the onset of sawtoothing and following high power neutral injection. Many detailed properties of the snakes are investigated, principally from soft X-ray measurements, and impurities are found to play a significant role. The snake is used as a diagnostic of the q = 1 surface through the sawtooth cycle. The possible mechanisms which could sustain the snake are discussed.

Additional information

Authors: GILL R D, JET Joint Undertaking, Abingdon, Oxon. (GB);EDWARDS A W, JET Joint Undertaking, Abingdon, Oxon. (GB);PASINI D, JET Joint Undertaking, Abingdon, Oxon. (GB);WELLER A, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: JET-P(91)54 EN (1991) 33 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199210399 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en