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Transport analysis of JT-60 plasma with the drift wave turbulence model

H. Shirai, T. Hirayama, K. Shimizu, T. Takizuka, M. Azumi1989年被引用 10Nuclear FusionIF 3出版社

Characteristics of the JT-60 plasma in both the Ohmic heating phase and the neutral beam heating phase have been studied numerically by using a one-dimensional tokamak transport code, with the thermal conductivities based on the drift wave turbulence (DWT) model. The numerical results for the central electron temperature Te(0) and the energy confinement time τE show good agreement with the experimental data in the medium line averaged electron density range e ∼ 4 × 1019 m−3, for both Ohmic heating and neutral beam'heating cases. The absorbed power degradation of is also reproduced with this model. On the other hand, the DWT model underestimates the plasma temperatures at low line averaged electron density, especially in the neutral beam heating phase, because of the strong dependence of the thermal conductivity on the electron temperature, and high temperature plasmas cannot be reproduced. This leads to a discrepancy in the e dependence of τE between experiment and calculation. The current dependence of τE is not reproduced either, even when the Venetian blind model is used.

日本語訳

JT-60プラズマのオーミック加熱位相および中性粒子ビーム加熱位相の両方における特性を、ドリフト波乱流(DWT)モデルに基づく熱伝導率を用いた一次元トカマク輸送コードにより数値的に研究した。中心電子温度Te(0)およびエネルギー閉じ込め時間τEに関する数値結果は、平均電子密度e ∼ 4 × 10¹⁹ m⁻³の範囲において、オーミック加熱および中性粒子ビーム加熱の両方の場合で実験データと良好な一致を示した。吸収パワーの劣化もこのモデルで再現された。一方、DWTモデルは、低平均電子密度において、特に中性粒子ビーム加熱位相で、熱伝導率の電子温度への強い依存性のためにプラズマ温度を過小評価し、高温プラズマを再現できなかった。これは、τEのe依存性における実験と計算の間の不一致につながる。さらに、ベネチアンブラインドモデルを用いた場合でも、τEの電流依存性は再現されなかった。

装置

jt-60sa高精度(タイトル一致)

wiki

Drift wavesJT-60Drift wave turbulence
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