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Injected mass deposition thresholds for lithium granule instigated triggering of edge localized modes on EAST

R. Lunsford, Z. Sun, R. Maingi, J.S. Hu, D. Mansfield, W. Xu, G.Z. Zuo, A. Diallo, T. Osborne, K. Tritz2018年被引用 24Nuclear FusionIF 3出版社

The ability of an injected lithium granule to promptly trigger an edge localized mode (ELM) has been established in multiple experiments. By horizontally injecting granules ranging in diameter from 200 microns to 1 mm in diameter into the low field side of EAST H-mode discharges we have determined that granules with diameter  >600 microns are successful in triggering ELMs more than 95% of the time. It was also demonstrated that below 600 microns the triggering efficiency decreased roughly with granule size. Granules were radially injected from the outer midplane with velocities ~80 m s−1 into EAST upper single null discharges with an ITER like tungsten monoblock divertor. These granules were individually tracked throughout their injection cycle in order to determine their efficacy at triggering an ELM. For those granules of sufficient size, ELM triggering was a prompt response to granule injection. By simulating the granule injection with an experimentally benchmarked neutral gas shielding (NGS) model, the ablatant mass deposition required to promptly trigger an ELM is calculated and the fractional mass deposition is determined.

日本語訳

リチウム顆粒の注入が端部局在モード(ELM)を即座に誘発できることは、複数の実験で実証されている。直径200ミクロンから1 mmの顆粒をEASTの低磁場側へ水平に注入することにより、直径600ミクロン超の顆粒は95%以上の確率でELMの誘発に成功することが判明した。また、600ミクロン未満では、誘発効率は顆粒の大きさにほぼ比例して低下することも実証された。顆粒は、ITER類似のタングステンモノブロックダイバータを備えたEAST上側シングルヌル配位において、外側中平面から速度約80 m s⁻¹で径方向に注入された。これらの顆粒は、ELM誘発の有効性を判定するために、注入サイクル全体を通じて個別に追跡された。十分な大きさの顆粒については、ELM誘発は顆粒注入に対する即時応答であった。実験的に検証された中性ガス遮蔽(NGS)モデルを用いて顆粒注入をシミュレーションすることにより、即時のELM誘発に必要なアブラント質量堆積が算出され、質量堆積割合が決定された。

装置

east高精度(タイトル一致)iter低精度(概要文一致)

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EASTEdge localized modeLithium
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