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Abstract

The results of our investigation on the spectral characteristics, spatial structure and scaling with plasma parameters of low frequency density fluctuations in ohmically heated TCA plasmas are presented. A substantial fraction of the spectral energy is found to be associated with fairly small perpendicular wave numbers, langle k-"perp"rangle widetilde < 2 rad/cm. Profile measurements indicate that the edge is dominated by low frequencies (widetilde < 100 kHz) whereas the higher frequencies (widetilde > 100 kHz) dominate in the interior. An asymmetry between the low and the high field side is observed, confirming observations on two different machines. The estimated local level of the fluctuations and its scaling with plasma parameters is found to follow Kadomtsev's mixing length rule "it n/"/"it n/" cong (langle k-"perp"rangle L-"rm n")"-1".

Additional information

Authors: WEISEN H, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);HOLLENSTEIN C, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);BEHN R CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND), CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
Bibliographic Reference: PLASMA PHYSICS AND CONTROLLED FUSION, VOL. 30 (1988), NO. 3, PP. 293-309
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