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Confinement in Wendelstein 7-X limiter plasmas

M. Hirsch, A. Dinklage, A. Alonso, G. Fuchert, S. Bozhenkov, U. Höfel, T. Andreeva, J. Baldzuhn, M. Beurskens, H.-S. Bosch2017年被引用 16Nuclear FusionIF 3出版社

Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities  <2–3 · 1019 m−3. With the available 4.3 MW ECR Heating core Te ~ 8 keV, Ti ~ 1–2 keV are achieved routinely resulting in energy confinement time τE between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked Te-profiles and positive Er up to about half of the minor radius. Profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

日本語訳

最初の閉じ込め実験キャンペーンにおける観測結果をまとめる。W7-Xは5つのインードリミッターのみを装備しており、放電時間は局所的な加熱を避けるために制限された。定常プラズマは低密度(<2–3・10^19 m^-3)に限定された。利用可能な4.3 MWの電子サイクロトロン加熱により、コア電子温度は約8 keV、イオン温度は1–2 keVに達し、エネルギー閉じ込め時間は80~150 msとなった。これらの条件下では、プラズマはコア電子閉じ込め特性を示し、電子温度分布はピーク状となり、動径電場は約半分の半径まで正となった。分布とプラズマ電流は、それぞれ軸上・軸外加熱および共方向・反共方向ECCDに応答した。

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