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Numerical study of potential heat flux mitigation effects in the TCV snowflake divertor

T Lunt, G P Canal, B P Duval, Y Feng, B Labit, P McCarthy, H Reimerdes, W A J Vijvers, M Wischmeier2016年Plasma Physics and Controlled FusionIF 2.2出版社

We report on EMC3-Eirene simulations of the plasma and neutral particle transport the TCV boundary layer of a series of snowflake (SF) equilibria characterized by the normalized poloidal flux coordinate of the secondary X-point x2. We refer to a snowflake plus (SF+) for , a snowflake minus (SF−) for and a single-null (SN) for . Four effects are identified that have the potential to mitigate the heat flux density at the outer strike point in a LFS SF−where x2 is located on the low field side of the primary X-point x1: (1) a scrape-off layer heat flux splitting, (2) an impurity radiation cloud forming at x2 (3) the increased connection length to the outer target and (4) increased transport between x1 and x2. The LFS SF− is thus expected to tolerate a larger power flux over the separatrix than a comparable SN configuration.

日本語訳

我々は、一連のスノーフレーク(SF)平衡状態におけるTCV境界層のプラズマおよび中性粒子輸送に関するEMC3-Eireneシミュレーションについて報告する。これらの平衡状態は、二次X点の規格化ポロイダル磁束座標x2によって特徴づけられる。x2が正の場合をスノーフレークプラス(SF+)、負の場合をスノーフレークマイナス(SF−)、x2がゼロの場合をシングルヌル(SN)と呼ぶ。LFS SF−(x1が一次X点の低磁場側に位置する場合)における外側ストライク点の熱流束密度を低減し得る4つの効果が特定された:(1)スクレイプオフ層における熱流束の分割、(2)x2における不純物放射雲の形成、(3)外側ターゲットへの接続長の増大、(4)x1とx2の間の輸送の増大である。したがって、LFS SF−は、同等のSN配位よりもセパラトリックスを横切るより大きな電力束に耐えることが期待される。

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