Nonlocal diffusivity: Impact on transient transport studies

A. Jacchia, P. Mantica, F. De Luca, P. Galli, G. Gorini

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Abstract

Nonlocal effects are observed in a number of transient transport studies in tokamaks and stellarators. In this paper some consequences of nonlocality are discussed on the basis of a heuristic model for the electron heat diffusivity (χe). The main consequence is the presence of an additional ("missing") heating power term (p̃χ) in the heat transport equation. Suitable combinations of px and modulated power profiles should give rise to detectable effects in modulated heating experiments such as those planned on the Frascati Tokamak Upgrade (FTU) [R. Andreani et al., in Fusion Technology, Proceedings of the 16th Symposium, London, 1990, edited by B. E. Keen, M. Huguet, and R. Hemsworth (Elsevier Science, Amsterdam, 1991), Vol. 1, p. 218]. Failure to properly include p̃χeffects (if present) can lead to an overestimate of χefrom heat wave propagation analysis. © 1995 American Institute of Physics.
Original languageEnglish
Pages (from-to)4589 - 4595
Number of pages7
JournalPhysics of Plasmas
Volume2
Issue number12
DOIs
Publication statusPublished - 1995
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Jacchia, A., Mantica, P., De Luca, F., Galli, P., & Gorini, G. (1995). Nonlocal diffusivity: Impact on transient transport studies. Physics of Plasmas, 2(12), 4589 - 4595. https://doi.org/10.1063/1.871444