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Statistical analysis and modeling of intermittent transport events in the tokamak scrape-off layer

Johan Anderson (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; Federico Halpern ; Pavlos Xanthopoulos ; Paolo Ricci ; Ivo Furno
Physics of Plasmas (1070-664X). Vol. 21 (2014), 12, p. article no. 122306.
[Artikel, refereegranskad vetenskaplig]

The turbulence observed in the scrape-off-layer of a tokamak is often characterized by intermittent events of bursty nature, a feature which raises concerns about the prediction of heat loads on the physical boundaries of the device. It appears thus necessary to delve into the statistical properties of turbulent physical fields such as density, electrostatic potential, and temperature, focusing on the mathematical expression of tails of the probability distribution functions. The method followed here is to generate statistical information from time-traces of the plasma density stemming from Braginskii-type fluid simulations and check this against a first-principles theoretical model. The analysis of the numerical simulations indicates that the probability distribution function of the intermittent process contains strong exponential tails, as predicted by the analytical theory.

Nyckelord: Fusion, Statistical theory, SOL



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Denna post skapades 2014-12-17. Senast ändrad 2016-10-18.
CPL Pubid: 208393

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi (2013-2017)

Ämnesområden

Energi
Plasmafysik med fusion

Chalmers infrastruktur