Snake-like density perturbations in JETFunded under: FP2-FUSION 10C
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.
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
Original language: en
Available languages: en