Bohm-like dependence of transport in scrape-off layer plasmas

Satoru Sugita, Masatoshi Yagi, S. I. Itoh, Kimitaka Itoh

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Nondiffusive radial transport in scrape-off layer (SoL) is investigated using the two-dimensional SoL interchange turbulence simulation code, which reproduces plasma blobs. From nonlinear simulations, it is found that a mesoscale convective cell emerges from interchange turbulence and propagates in the radial direction. Blob structures are formed autonomously and their ballistic propagation dominates SoL radial transport. A high-density tail in the radial profile is reproduced. This indicates the existence of a 2nd SoL. The effective transport coefficient is analyzed and a Bohm-like dependence is found. It is concluded that the flux-driven turbulence in SoL induces Bohm-like "nondiffusive" transport. The PDF of the turbulence-driven flux is also investigated. It is found that the PDF distribution follows a stretched Gaussian distribution.

Original languageEnglish
Article number044501
JournalJournal of the Physical Society of Japan
Volume81
Issue number4
DOIs
Publication statusPublished - Apr 1 2012

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plasma layers
turbulence
normal density functions
ballistics
simulation
transport properties
propagation
profiles
cells

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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Bohm-like dependence of transport in scrape-off layer plasmas. / Sugita, Satoru; Yagi, Masatoshi; Itoh, S. I.; Itoh, Kimitaka.

In: Journal of the Physical Society of Japan, Vol. 81, No. 4, 044501, 01.04.2012.

Research output: Contribution to journalArticle

Sugita, Satoru ; Yagi, Masatoshi ; Itoh, S. I. ; Itoh, Kimitaka. / Bohm-like dependence of transport in scrape-off layer plasmas. In: Journal of the Physical Society of Japan. 2012 ; Vol. 81, No. 4.
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