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内容記述 |
According to the physics design of JA-DEMO, the exhausted thermal power P_sep from the core plasma to the open field region reaching the wall surfaces, i.e., the scrape-off layer (SOL), is reported to 220 ~ 300 MW, which is much larger than ITER. Therefore, it is one of the biggest challenges for the design and operation of JA-DEMO to handle such a huge heat flux onto the plasma-facing components, especially the divertor targets. This motivates the exploration of possible solutions to dissipate power efficiently in the SOL and divertor region to ensure maximum steady-state power load at the divertor target below 10MW/m2 (the engineering limit of heat load for tungsten divertor target) in JA-DEMO. Now the SOLPS-ITER code is used to evaluate the effects of Ar seeding rate on divertor plasma. Under the different scenarios(Pcore/edge =250 and 300 MW), as Ar radiation impurity is increased from 1.0e19 to 1.0e20 atoms/s with the corresponding Ar concentration from 4 0.54% to 2.11%, the heat flux density and electron temperature at the divertor targets can be controlled well(<10MW/m^2) with low ne,sep = 2.0 ~ 3.5e19m-3. |
