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 language | English |
|---|---|
| Article number | 044501 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 81 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Apr 1 2012 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
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 journal › Article
}
TY - JOUR
T1 - Bohm-like dependence of transport in scrape-off layer plasmas
AU - Sugita, Satoru
AU - Yagi, Masatoshi
AU - Itoh, S. I.
AU - Itoh, Kimitaka
PY - 2012/4/1
Y1 - 2012/4/1
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=84859926234&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.81.044501
DO - 10.1143/JPSJ.81.044501
M3 - Article
AN - SCOPUS:84859926234
VL - 81
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 4
M1 - 044501
ER -