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Effect of the limiter position on the scrape-off layer width, radial electric field and intrinsic flows

J. Loizu, P. Ricci, F.D. Halpern, S. Jolliet, A. Mosetto2014年被引用 21Nuclear FusionIF 3出版社

The effect of the limiter position on the scrape-off layer (SOL) width, radial electric field and intrinsic flows is investigated via global, three-dimensional turbulence simulations in four different limiter configurations. The limiter position affects the SOL dynamics in a number of ways, for example by changing the effective connection length or by modifying the unstable modes present in the system. The simulations show that the SOL width is much smaller and less poloidally asymmetric when the plasma is limited on the low-field side than on the high-field side, which can be explained by a change in the turbulence regime between the two configurations. The radial electric field is determined by the combined effect of the sheath physics and the electron adiabaticity condition, and its poloidal structure depends on the limiter position, as it can be fairly well explained through an analytical model. Intrinsic parallel flows established in the SOL, typically leading to co-current toroidal rotation with a magnitude that strongly depends on the limiter position, can also be fairly well reproduced analytically for each limiter configuration.

日本語訳

リミター位置がスクレイプオフ層(SOL)の幅、径方向電場、および固有フローに及ぼす影響を、4つの異なるリミター配位における三次元大域的乱流シミュレーションによって調べた。リミター位置は、例えば実効的な接続長を変化させたり、系内に存在する不安定モードを変化させたりすることにより、SOLのダイナミクスに多様な影響を及ぼす。シミュレーション結果は、プラズマが低磁場側でリミターされる場合、高磁場側でリミターされる場合と比較して、SOL幅がはるかに小さく、ポロイダル方向の非対称性も小さいことを示しており、これは2つの配位間における乱流状態の変化によって説明できる。径方向電場は、シース物理と電子の断熱性条件の複合効果によって決定され、そのポロイダル構造はリミター位置に依存するが、これは解析モデルによってかなり良好に説明できる。SOL内に確立される固有の平行フローは、典型的にはリミター位置に強く依存する大きさのコ方向トロイダル回転をもたらすが、これも各リミター配位について解析的にかなり良好に再現できる。

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Scrape-off layerLimiterRadial electric field
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