Non-local model analysis of heat pulse propagation and simulation of experiments in W7-AS

Takuya Iwasaki, Sanae I. Itoh, Masatoshi Yagi, Kimitaka Itoh, Ulich Stroth

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24 Citations (Scopus)


A new model equation which includes the non-local effect in the heat flux is introduced to study the transient transport phenomena. A non-local heat flux. which is expressed in terms of the integral equation, is superimposed on the conventional form of the heat flux. This model is applied to describe the experimental results from the power switching [U. Stroth et al.: Plasma Phys. Control. Fusion 38 (1996) 1087] and the power modulation experiments [L. Giannone et al.: Nucl. Fusion 32 (1992) 1985] in the W7-AS stellarator. A small fraction of non-local component in the heat flux is found to be very effective in modifying the response against an external modulation. The transient feature of the transport property, which are observed in the response of heat pulse propagation, are qualitatively reproduced by the transport simulations based on this model. A possibility is discussed to estimate the correlation length of the non-local effect experimentally by use of the results of transport simulations.

Original languageEnglish
Pages (from-to)478-486
Number of pages9
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - Feb 1999

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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