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Radial electric field in JET advanced tokamak scenarios with toroidal field ripple

K Crombé, Y Andrew, T M Biewer, E Blanco, P C de Vries, C Giroud, N C Hawkes, A Meigs, T Tala, M von Hellermann2009年Plasma Physics and Controlled FusionIF 2.2出版社

A dedicated campaign has been run on JET to study the effect of toroidal field (TF) ripple on plasma performance. Radial electric field measurements from experiments on a series of plasmas with internal transport barriers (ITBs) and different levels of ripple amplitude are presented. They have been calculated from charge exchange measurements of impurity ion temperature, density and rotation velocity profiles, using the force balance equation. The ion temperature and the toroidal and poloidal rotation velocities are compared in plasmas with both reversed and optimized magnetic shear profiles. Poloidal rotation velocity (vθ) in the ITB region is measured to be of the order of a few tens of km s−1, significantly larger than the neoclassical predictions. Increasing levels of the TF ripple are found to decrease the ion temperature gradient in the ITB region, a measure for the quality of the ITB, and the maximum value of vθ is reduced. The poloidal rotation term dominates in the calculations of the total radial electric field (Er), with the largest gradient in Er measured in the radial region coinciding with the ITB.

日本語訳

JETにおいて、トロイダル磁場リップルがプラズマ性能に及ぼす影響を研究するための専用キャンペーンが実施された。内部輸送障壁(ITB)を有し、リップル振幅が異なる一連のプラズマにおける径方向電場測定結果が提示される。これらは、不純物イオン温度、密度、および回転速度プロファイルの荷電交換測定から、力の釣り合い式を用いて計算された。イオン温度、トロイダルおよびポロイダル回転速度は、反転および最適化された磁気シアプロファイルを有するプラズマの両方で比較される。ITB領域におけるポロイダル回転速度(vθ)は、数十km s⁻¹のオーダーで測定され、新古典論的予測よりも有意に大きい。TFリップルの増加は、ITB領域におけるイオン温度勾配(ITBの品質の指標)を減少させ、vθの最大値も低減することが見出された。全径方向電場(Er)の計算においてポロイダル回転項が支配的であり、Erの最大勾配はITBと一致する径方向位置で測定された。

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jet高精度(タイトル一致)

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JETRadial electric fieldAdvanced tokamakField ripple
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