Modeling of argon seeding in ASDEX Upgrade H-mode plasma with SOLPS5.0. (August 2017)

• Record Type: Journal Article
• Authors: Xiang, L.Y.; Wischmeier, M.; Coster, D.; Bernert, M.; Guo, H.Y.; Luo, G.N.; team, ASDEX Upgrade
• Is Part Of: Nuclear materials and energy. Volume 12(2017)
• Page Start: 1146
• Page End: 1151
• Publication Date: 2017-08
• Subjects: Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2017.02.017
• Languages: English
• ISSNs: 2352-1791

Abstract

Highlights: Ar compression increases when the inner divertor detaches in simulation. Reduced Ar source in the core may be due to the increased shear flow in SOL. Friction force pushes Ar from the outer divertor to the inner divertor and HFS SOL. In core plasma temperature region, increasing Ar density increases the radiation. When Te < 20 eV, increasing Ar density does not increase the radiation. Abstract: SOLPS modeling of Ar seeding in ASDEX Upgrade H-mode plasma shows that the divertor compression of Ar increases with the seeding rate when the inner divertor is detached and the outer divertor is attached. This results from the redistribution of the Ar density as the inner divertor detaches. During the detachment of the inner divertor, the parallel friction and thermal forces on Ar increase in the inner divertor and decrease in the outer divertor. The net force of the two directs Ar from the low field side to the high field side of the plasma along the field line. The net force is found to be stronger after the detachment of the inner divertor in the simulation. Although the divertor compression of Ar increases, the ratio of radiated power by Ar inside the divertor over that inside the separatrix does not increase after the detachment. This is because the radiation efficiency, i.e. the radiated per Ar particle on average decreases with the seeding rate in the divertor and increases inside the separatrix. The radiation efficiency in the simulation is determined by the characteristic cooling curve of Ar and the transport effects.