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Divertor power spreading in the Divertor Tokamak Test facility for a full power scenario with Ar and Ne seeding

I Ivanova-Stanik, P Chmielewski, Ch Day, P Innocente, R Zagórski2023年Plasma Physics and Controlled FusionIF 2.2出版社

This work describes integrated numerical modelling applied to Divertor Tokamak Test (DTT) scenarios with tungsten wall and divertor in single null configuration using the COREDIV code, which self-consistently solves 1D radial transport equations of plasma and impurities in the core region and 2D multi-fluid transport in the scrape-off layer (SOL). COREDIV code simulations have been performed and compared to the already published solutions from JETTO for DTT full power discharges with Ar seeding. The influence of the particle transport on the fuelling and flux to the plate is analysed. The main conclusion from the performed simulations is that Ne and Ar radiate effectively in the SOL and no difference was found in the fuelling properties between them. The fuelling increases with increase in radial transport in the core region. It has been found that the rise in the diffusion in the core plasma has a small influence on several global plasma parameters, such as plasma radiation, impurity concentration and fluxes to the divertor plate, but has a strong effect on the fuelling. The fuelling and deuterium flux to the plate decrease almost linearly with decreasing plasma density, keeping = constant.

日本語訳

本論文では、単一ヌル配位におけるタングステン壁およびダイバータを備えたDivertor Tokamak Test(DTT)シナリオに適用した統合数値モデリングについて述べる。本モデリングにはCOREDOGコードを用いており、このコードはコア領域におけるプラズマおよび不純物の1次元動径輸送方程式と、スクレイプオフ層(SOL)における2次元多流体輸送を自己無撞着に解くものである。COREDOGコードによるシミュレーションを実施し、Arシーディングを伴うDTTフルパワー放電について既に発表されているJETTOの結果と比較した。粒子輸送が燃料供給およびダイバータ板への粒子束に及ぼす影響を解析した。実施したシミュレーションから得られた主な結論として、NeおよびArはSOLにおいて効果的に放射し、両者の燃料供給特性に差異は見られないことが明らかになった。燃料供給はコア領域における動径輸送の増加に伴って増大する。コアプラズマにおける拡散の上昇は、プラズマ放射、不純物濃度、ダイバータ板への粒子束などのいくつかの全体パラメータには小さな影響しか及ぼさないが、燃料供給には強い影響を及ぼすことが見出された。燃料供給およびダイバータ板への重水素粒子束は、密度を一定に保った場合、密度の低下に伴ってほぼ線形的に減少する。

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