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Magnetic island structures and their rotation after pellet injection in FTU

E. Giovannozzi, S.V. Annibaldi, P. Buratti, D. Frigione, E. Lazzaro, L. Panaccione, O. Tudisco2004年被引用 16Nuclear FusionIF 3出版社

Pellet injection gives rise to a rich variety of observations on m = 1 island dynamics. Pellet ablation near the q = 1 surface triggers fast growth of an island; as the island reaches a large amplitude, magnetic reconnection mixes the plasma centre with the q = 1 pellet fuelled region, so enhancing the effective pellet deposition depth. Long-lived m = 1 islands that coexist with sawtooth crashes are accompanied by higher harmonics (m/n = 1 with m > 1, where m is the poloidal mode number and n is the toroidal one) near the q = 1 surface; progressive phase shifts observed in the phase of such harmonics indicate island deformation by sheared viscous flow. Coupling between m = 1 and m = 2 islands is observed in sawtooth-free plasmas. Reconnection at the q = 2 surface is driven by a toroidal sideband of the m = 1 island; coupling is associated with strong braking of the m = 1 island.

日本語訳

ペレット入射は、m = 1 島のダイナミクスに関する多様な観測をもたらす。q = 1 面付近でのペレットアブレーションは、島の急速な成長を引き起こす。島が大きな振幅に達すると、磁気リコネクションがプラズマ中心部と q = 1 ペレット燃料領域を混合し、実効的なペレット堆積深さを増大させる。鋸歯状波クラッシュと共存する長寿命の m = 1 島には、q = 1 面付近で高次高調波(m/n = 1、ここで m はポロイダルモード数、n はトロイダルモード数)が伴う。このような高調波の位相に観測される progressive phase shift は、粘性シア流による島の変形を示している。鋸歯状波のないプラズマでは、m = 1 島と m = 2 島の結合が観測される。q = 2 面でのリコネクションは、m = 1 島のトロイダルサイドバンドによって駆動され、この結合は m = 1 島の強い制動を伴う。

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Magnetic islandsPellet injectionFTU
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