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Ripple induced diffusion of fast ions in tokamaks with an elliptic cross-section

Ya.I. Kolesnichenko, V.A. Yavorskij1989年被引用 13Nuclear FusionIF 3出版社

The diffusion of high energy ions caused by toroidal magnetic field ripple in a tokamak with flux surfaces of elliptical cross-section is studied. It is shown that the elongation of the cross-section increases the characteristic ripple value above which the collisionless motion of the trapped particles becomes stochastic. The elongation also results in a reduction of the diffusion coefficient, both in the regime of collisionless (intrinsic) stochasticity and in various collisional regimes. It is further shown that in an elliptical tokamak the energy range in which the weak collision regime is achieved is narrowed, and the range characterized by ripple-plateau diffusion is broadened. The distribution of the fast ion flux to the wall is also considered.

日本語訳

トロイダル磁場リップルによって引き起こされる、楕円断面の磁束面を持つトカマクにおける高エネルギーイオンの拡散を研究する。断面の伸長により、捕捉粒子の無衝突運動が確率的になる臨界リップル値が増加することを示す。また、伸長は、無衝突(固有)確率性の領域と様々な衝突領域の両方において、拡散係数の減少をもたらす。さらに、楕円トカマクでは、弱衝突領域が達成されるエネルギー範囲が狭くなり、リップル・プラトー拡散によって特徴づけられる範囲が広がることを示す。壁への高速イオンフラックスの分布についても考察する。

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