Electron Parallel Heat Transport in the Scrape-off Layer Using a Particle-in-Cell Code

概要

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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.