Evidence of Levy stable process in tokamak edge turbulence

In an effort to understand the fundamental physics of turbulent transport of particles and heat in a tokamak, the floating potential fluctuations in the the scrape-off layer plasma of ohmically heated ADITYA tokamak are analysed for self-similarity using distribution function approach. It is observe...

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Bibliographic Details
Published in:arXiv.org 2001-10
Main Authors: Jha, R, Kaw, P K, Kulkarni, D R, Parikh, J C, Team, ADITYA
Format: Article
Language:English
Subjects:
Data points
Distribution functions
Levy distribution
Plasmas (physics)
Self-similarity
Tokamak devices
Turbulence
Variation
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Summary:In an effort to understand the fundamental physics of turbulent transport of particles and heat in a tokamak, the floating potential fluctuations in the the scrape-off layer plasma of ohmically heated ADITYA tokamak are analysed for self-similarity using distribution function approach. It is observed that the distribution function of a sum of n data points converges to a Levy distribution of scale index, alpha=1.111 for n < 40 and alpha=2.0 for larger n. In both scaling ranges, the edge fluctuation is self-similar. This observation is backed by several supporting evidences. The results indicate that the small scale fluctuations transport matter and heat dominantly by convection whereas the transport due to large scale flucuations is by a diffusive process.
ISSN:2331-8422