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Ice pellet injection experiments have been widely carried out with various toroidal plasmas, and some interesting phenomena have been found. One of them is the unique oscillation, sometimes called the snake oscillation, of the soft X-ray emission region after pellet injection, observed in Alcator C, JET, JT-60 and W7-AS. A deuterium (hydrogen) ice pellet with a size of 1.4 mm (phi and I) and with velocities in the range of 400 to approximately 900 m/s has been injected into ohmically heated plasmas in the TEXTOR tokamak and some interesting phenomena have been studied. Fast oscillations of large perturbation in density and a slight one in temperature have been observed just after the pellet injection. The structure of the activity is analysed in detail, and the relation with sawtooth activities is discussed.

Additional information

Authors: SATO K N ET AL., National Institute for Fusion Science, Nagoya (JP);AKIYAMA H, Kumamoto University (JP);KOGOSHI S, Science University of Tokyo, Noda (JP);DIPPEL K H ET AL., Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Article: Proceedings of the 19th Conference on Controlled Fusion and Plasma Physics, Vol. 1 (1992) pp. 403-406
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