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Abstract

This study focuses on how the fluctuation amplitude varies over the possible wide range of Tokamak operational parameters. It concerns the ohmic phase of TCA; the main parameters of TCA are: R = 61 cm, a = 18 cm, Bphi <or= 1.51 T, I-p <or= 175 kA with a current flat top of <= 150 ms, yielding n-e <or= 10**14 cm**$8Z**3 and T-e <or= 1 keV. The fluctuating field is detected with wide bandwidth, triple (measuring b-r, b-theta and b-phi) magnetic probes, placed in the shadow of the limiters. The results were obtained from a probe situated in the equatorial plane. Spectral information at frequencies above that of the Mirnov oscillations (about 10 kHz) was obtained by passing the probe signal through a series of 8 adjacent half-octave passive bandpass filters, covering 40 - 660 kHz. The results of the study serve to extend the preliminary results of magnetic fluctuation scaling obtained to date to a much wider range of Tokamak operation, as well as quantifying the dependence on various plasma parameters. In addition, the important role played by the plasma geometry in determining the polarization of the magnetic fluctuations has been shown.

Additional information

Authors: SAWLEY M L, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);POCHELON A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);KELLER 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: 12TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA PHYSICS, BUDAPEST (HUNGARY), SEPT. 2-6, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32041 ORA
Availability: Can be ordered online
Record Number: 1989124026200 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en