Development of new turbulent data-analysis techniques for the analysis of anomalous transport measured by the heavy-ion-beam probe on the TEXT tokamak
The turbulent-plasma data used in this thesis were measured by the heavy-ion-beam probes on the TEXT and RENTOR tokamaks. Some published data on the TEXT, CALTECH, and PRETEXT tokamaks measured by Langmuir probes were also used. A model with two-parameter control is proposed. The theoretical basis and mathematical derivation of the new model are presented. This model has been shown to produce better frequency resolution and more reliable results in extraction of the statistical spectral information from plasma turbulent data in a rather noisy background. A quasi-coherent statistical wave packet with coherence nearly unity at the central frequency is first identified in both the density and potential turbulence on TEXT and RENTOR. The coherent mode with a statistical poloidal wave number about (3.5 {plus minus} 0.5) 1/cm and a statistical group velocity about 3 {times} 10{sup 5} cm/s is propagating in the ion diamagnetic drift direction at the radial position r = 24 cm and is characterized by a relative turbulent level about 20% and high-mode number about 74-92, which may suggest the source of the plasma turbulence. The direction of energy cascading is suggested from low frequency to high frequency in the spectral space.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA)
- OSTI ID:
- 5215464
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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