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Transport of edge-localized mode energy in a scrape-off layerin the presence of collisionless fast electrons

A. Bergmann2002年被引用 48Nuclear FusionIF 3出版社

The transport of the energy delivered by an edge-localized mode (ELM) into the scrape-off layer (SOL) of a tokamak plasma is studied with particle-in-cell simulations. A simple one-dimensional model witha Monte-Carlo procedure for Coulomb collisions is used.The SOL is collisional before the ELM, but the mean-free-path lengthin the hot ELM plasma is longer than the connection length, such thatfast electrons can travel directly from the midplane to the target plate.However, the sheath potential increases rapidly, andmost of the energy is transported with a velocity of order of the ion sound speed if secondary electron emission (SEE) is absent or weak.In the case of strong SEE, though, a large fraction of the energy can be carried by fast electrons during the ELM pulse.

日本語訳

トカマクプラズマのスクレイプオフ層(SOL)への周辺局在モード(ELM)によって供給されるエネルギーの輸送を、粒子インセルシミュレーションで研究した。クーロン衝突に対するモンテカルロ法を備えた単純な1次元モデルを用いた。SOLはELM前は衝突的であるが、高温のELMプラズマ中の平均自由行程は接続長より長く、そのため高速電子は赤道面からターゲット板まで直接移動できる。しかし、シース電位は急激に上昇し、二次電子放出(SEE)が存在しないか弱い場合、エネルギーの大部分はイオン音速のオーダーの速度で輸送される。しかしながら、強いSEEの場合、ELMパルス中にエネルギーの大部分が高速電子によって運ばれ得る。

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Fusion Advanced Studies TorusEdge localized modeScrape-off layer
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