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3D effects of neon injection positions on the toroidally symmetric/asymmetric heat flux distribution on EAST

B Liu, S Y Dai, G Kawamura, L Zhang, Y Feng, D Z Wang2020年Plasma Physics and Controlled FusionIF 2.2出版社

The heat flux deposition on the divertor targets with neon impurity injection on EAST has been investigated using the three-dimensional (3D) edge transport code EMC3-EIRENE. The impact of different poloidal neon injection positions on heat flux deposition has been studied. It was found that neon impurities injected at the in- and out-board divertors (i.e. strike points) lead to toroidally asymmetric distributions of heat load on the in- and out-board targets, respectively. However, neon gas puffing upstream shows a toroidally symmetric distribution of heat load. The 3D effects of the neon radiation on the heat load have been investigated with the help of a field line tracing technique, which indicates that neon impurities injected near the strike point can radiate more power and result in a lower heat load compared with upstream neon injection. In order to further verify the asymmetric distribution of heat load, two impurity injection locations away from the strike points at the divertor are investigated, which show the symmetric distribution of heat load as with the upstream neon injection.

日本語訳

EASTにおけるネオン不純物注入を伴うダイバータターゲットへの熱流束堆積を、3次元エッジ輸送コードEMC3-EIRENEを用いて調査した。異なるポロイダル方向のネオン注入位置が熱流束堆積に及ぼす影響を研究した。ネオン不純物をイン側およびアウト側ダイバータ(すなわちストライク点)に注入すると、それぞれイン側およびアウト側ターゲット上でトロイダル方向に非対称な熱負荷分布が生じることが見出された。一方、上流部でのネオンガス噴射は、トロイダル方向に対称な熱負荷分布を示した。ネオン放射による熱負荷への3次元効果を、磁力線追跡手法を用いて調べたところ、ストライク点近傍に注入されたネオン不純物はより多くのパワーを放射でき、上流部注入と比較してより低い熱負荷をもたらすことが示された。熱負荷の非対称分布をさらに検証するため、ダイバータのストライク点から離れた2つの注入位置を調査したところ、上流部ネオン注入と同様に対称な熱負荷分布を示した。

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