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Thermal conductivity due to ripple-trapped ions in a tokamak

P.N. Yushmanov1982年被引用 28Nuclear FusionIF 3出版社

The author considers how the collisionless detrapping of particles from the magnetic mirrors formed between discrete longitudinal field coils affects the thermal conductivity of trapped ions, . The effect is significant when the distance over which a trapped ion drifts during the time of confinement in a local mirror (ripple well) , becomes comparable with the extent of the zone in which local magnetic mirrors exist, z0∼Nq Rδ (δ is the ripple depth, R the major radius of the torus, q the stability factor, N the number of coils, and ωB the cyclotron frequency). At temperatures for which Δ ≫ Z0, becomes proportional to νi. The range of operating temperatures in a tokamak reactor corresponds to Δ ≲ z0. In this range the value of is 5–30 times lower than the value predicted previously and the dependence .

日本語訳

著者は、離散的な縦磁場コイルの間に形成される磁気ミラーからの粒子の無衝突デトラッピングが、捕捉イオンの熱伝導率、. にどのように影響するかを考察する。この効果は、捕捉イオンが局所ミラー(リップル井戸)内に閉じ込められている間にドリフトする距離が、局所磁気ミラーが存在する領域の広がりと同程度になるとき、すなわち z0∼Nq Rδ(δはリップル深さ、Rはトーラスの大半径、qは安全係数、Nはコイル数、ωBはサイクロトロン周波数)のときに顕著となる。Δ ≫ Z0 となる温度では、 は νi に比例する。トカマク炉の運転温度範囲は Δ ≲ z0 に対応する。この範囲では、 の値は以前に予測された値より5–30倍低く、その依存性は .

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Thermal conductivity
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