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Excitation of large, fast density oscillations has been observed in the core region of pellet-injected plasmas in TEXTOR. The oscillation seems most likely to occur when a pellet is injected more deeply into the plasma. The mode of oscillation is close to m = 1; n = 1, and the frequency is typically about 0.7 - 2 kHz. The oscillation usually terminates after about 10 milliseconds. In some cases a second oscillation is observed some 10 milliseconds after the termination of the first oscillation, and this phenomenon is unique to TEXTOR. In addition, the plasma current profile has been measured by the FIR Faraday rotation system, to provide information on q-profile changes before and after pellet injection.

Additional information

Authors: SATO K ET AL., National Institute for Fusion Science, Nagoya (JP);AKIYAMA H, Kumamoto University, Faculty of Engineering (JP);FINKEN K H ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);KOGOSHI S, University of Tokyo, Faculty of Science and Engineering (JP);SAKAMOTO M, Kyushu University, Research Institute for Applied Mechanics, Kasuga (JP)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. I (1993) pp. 239-242
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