首页|Simulations of Ar seeding by SOLPS-ITER for a slot-type divertor concept
Simulations of Ar seeding by SOLPS-ITER for a slot-type divertor concept
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NSTL
In order to fulfill the requirements for future high-power and long-pulse discharges in the Experimental Advanced Superconducting Tokamak, the present lower graphite divertor will be upgraded with tungsten (W) materials. For one of the new divertor options obtained during the physics design phase, simulations of argon (Ar) seeding are performed by using the SOLPS-ITER code suite. Besides the deuterium and Ar species, all the ionization states of W species generated through physical sputtering have been included in the simulations. As the seeding rate increases, the total power dissipation dominated by Ar radiation increases gradually. Obvious Ar radiation loss in the divertor region is observed. Meanwhile, a high pressure area in the scrape-off layer side of the outer strike point is formed near the corner due to the closed structure. As a result, the outer divertor detaches before the inner divertor, and the maximum T-e at the outer target reduces to 5eV at a puffing rate of 4.0x10(19) atoms/s. The total heat flux onto the inner and outer target plates, dominated by the charged particles, can be reduced simultaneously. The sputtering rate of W atoms along the divertor plates and the distribution of W impurities in the poloidal cross section are given. The W concentration inside the last closed magnetic flux surface can be controlled to the order of 10(-5).
NSTL
