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The diffusion limit of ballistic transport in the scrape-off layer
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At least the far scrape-off layer of magnetically confined fusion plasmas transport is intermittent and non-diffusive as observed by the appearance of plasma filaments. Transport codes using effective diffusion coefficients are still the main workhorse investigating the scrape-off layer and divertor regions. An effective perpendicular diffusion coefficient for intermittent filamentary dominated perpendicular transport in the scrape-off layer is motivated by the telegraph equation, describing an exponentially decaying correlated random walk. On short time scales, the telegraph equation describes the ballistic transport of filamentary structures with a typical velocity ub and correlation time τ. In stationary conditions, the corresponding diffusion coefficient is given by ub2τ. Since ub and τ can be determined experimentally, it is proposed to use ub2τ as an input for modeling or for interpretation of perpendicular transport in the far scrape-off layer.
Title: The diffusion limit of ballistic transport in the scrape-off layer
Description:
At least the far scrape-off layer of magnetically confined fusion plasmas transport is intermittent and non-diffusive as observed by the appearance of plasma filaments.
Transport codes using effective diffusion coefficients are still the main workhorse investigating the scrape-off layer and divertor regions.
An effective perpendicular diffusion coefficient for intermittent filamentary dominated perpendicular transport in the scrape-off layer is motivated by the telegraph equation, describing an exponentially decaying correlated random walk.
On short time scales, the telegraph equation describes the ballistic transport of filamentary structures with a typical velocity ub and correlation time τ.
In stationary conditions, the corresponding diffusion coefficient is given by ub2τ.
Since ub and τ can be determined experimentally, it is proposed to use ub2τ as an input for modeling or for interpretation of perpendicular transport in the far scrape-off layer.
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