[Table of Contents]

Plasma and Fusion Research

Volume 5, S1017 (2010)

Regular Articles

Electron Parallel Heat Transport in the Scrape-off Layer Using a Particle-in-Cell Code
Aaron FROESE, Tomonori TAKIZUKA1) and Masatoshi YAGI2)
IGSES, Kyushu University, Kasuga 816-8580, Japan
1)
Japan Atomic Energy Agency, Naka 311-0193, Japan
2)
RIAM, Kyushu University, Kasuga 816-8580, Japan
(Received 14 January 2009 / Accepted 22 May 2009 / Published 26 March 2010)

Abstract

Electron heat transport parallel to the magnetic field in the scrape-off layer plasma is investigated with the use of the particle-in-cell code PARASOL. Coulomb collisions are simulated correctly by a binary collision model. The heat flux is lost by radiation cooling, in addition to convection/conduction to the divertor plates. It is confirmed for the collisional case that the conductive heat flux is given by the Spitzer-Härm expression. For the long mean free path case, the conductive heat flux is limited to a factor αe of the free streaming value. It is found that αe is small (∼0.1 of the sheath-limited value) for the low radiation condition, but becomes large (∼1.0) for the high radiation condition.

Keywords

tokamak scrape-off layer, conductive heat flux, PIC simulation, PARASOL, collisionless flux limit

DOI: 10.1585/pfr.5.S1017

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References

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This paper may be cited as follows:

Aaron FROESE, Tomonori TAKIZUKA and Masatoshi YAGI, Plasma Fusion Res. 5, S1017 (2010).