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Neoclassical effect on strike point patterns in local island divertor configuration of LHD

Shigeaki Jimbo, Ryutaro Kanno, Hisanori Takamaru, Shinsuke Satake, Masao Okamoto2005年被引用 5Nuclear FusionIF 3出版社

Monte Carlo simulation based on test particle representation is carried out in order to investigate the neoclassical effect on a strike point pattern of ions on the local island divertor (LID) head in the Large Helical Device configuration. According to collisionality, the particle orbits mainly contributing the particle flux from the core region to the LID head vary; in the present paper we call it the neoclassical effect on the edge transport phenomena. The pattern on the LID head is numerically observed by tracing the guiding centre orbits of the test particles under the effects of Coulomb collision and anomalous diffusion. We find that the strike point patterns on the LID head are varied according to collisionality. For the case of λmfp/Lc > 1, the pattern is characterized by the passing particle orbits along the field lines of the island separatrix, where λmfp is the mean free path and Lc ≈ 250 m is the connection length given as a length along a field line connecting the core region to the LID head. On the other hand, for the case of λmfp/Lc ≪ 1, the particles intensively strike the edge of the LID head, and the pattern is given by the trapped particle orbits. The trapped particle orbits mainly contribute the particle flux from the core region through the inside of the island, and finally the particles arrive at the edge of the LID head.

日本語訳

モンテカルロシミュレーションをテスト粒子表現に基づいて実施し、大型ヘリカル装置配位における局所アイランドダイバータ(LID)ヘッド上のストライク点パターンに対する新古典効果を調べた。衝突頻度に応じて、コア領域からLIDヘッドへの粒子束に主に寄与する粒子軌道は変化する。本論文ではこれを周辺輸送現象に対する新古典効果と呼ぶ。LIDヘッド上のパターンは、クーロン衝突と異常拡散の影響下でのテスト粒子の案内中心軌道を追跡することにより数値的に観測される。ストライク点パターンは衝突頻度に応じて変化することが見出された。λmfp/Lc > 1の場合、パターンはアイランドセパラトリクスの磁力線に沿った通過粒子軌道によって特徴づけられる。ここで、λmfpは平均自由行程であり、Lc ≈ 250 mはコア領域からLIDヘッドまでを結ぶ磁力線に沿った長さとして与えられる接続長である。一方、λmfp/Lc ≪ 1の場合、粒子はLIDヘッドの端部に集中的に衝突し、パターンは捕捉粒子軌道によって与えられる。捕捉粒子軌道は、アイランド内部を通ってコア領域からLIDヘッドへの粒子束に主に寄与し、最終的に粒子はLIDヘッドの端部に到達する。

装置

lhd高精度(タイトル一致)

wiki

DivertorLHDIsland divertor
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