量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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Preceding study (Homma Y, Hoshino K, Tokunaga S, et al., 2018 Contrib. Plasma Phys. 58, 629-637) presented an advanced model for thermal force whose applicable condition is extended from collisional to relatively low collisional plasma. According to this extended model, the thermal force reduces when plasma collisionality decreases. In the present study, the extended thermal force model has been implemented into a SOL-divertor integrated simulation code SONIC, in order to study impact on impurity transport in DEMO-relevant Scrape-off layer (SOL) plasma, due to thermal force reduction. A set of test simulation has been carried out supposing a reference steady- state operation scenario of Japanese DEMO fusion reactor concept (JA DEMO). The thermal force has reduced by as much as 20-70%, reflecting relatively lower collisionality in DEMO SOL plasma. The simulation results have demonstrated that introduction of the collisionality dependence of thermal force leads to as much as 20-80% of effective decrease in impurity density and its content ratio widely over the SOL upstream area under DEMO relevant condition. Compared to the case with conventional thermal force model, relative change rate of impurity content at representative poloidal positions are as follows: low-eld side(LFS) X-point -59%; poloidal top area -22%; HFS upstream area up to -80%; no major impact around LFS upstream.
Effect of collisionality dependence of thermal force on impurity transport under lower collisional condition in DEMO scrape-off layer plasma
