High-density plasma with internal diffusion barrier in the Large Helical Device-猫眼课题宝

DOI：

10.1088/0029-5515/49/8/085002

发表时间：

2009-07

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

R. Sakamoto;M. Kobayashi;J. Miyazawa;S. Ohdachi;H. Yamada;H. Funaba;M. Goto;S. Masuzaki;T. Morisaki;I. Yamada;K. Narihara;K. Tanaka;S. Morita;K. Ida;S. Sakakibara;Y. Narushima;K. Watanabe;Y. Suzuki;N. Ashikawa;Y. Nagayama;B. Peterson;M. Shoji;C. Suzuki;M. Tokitani;S. Yoshimura;N. Ohyabu;A. Komori;O. Motojima

在大螺旋装置（LHD）的螺旋偏滤器中发现了一种有吸引力的高密度运行机制，即所谓的内扩散势垒（IDB）。IDB的特点是陡峭的密度梯度和等离子体轮廓被IDB分为高密度的核心等离子体和低密度的地幔等离子体。IDB使堆芯等离子体能够进入高密度/高压区。可达到的中心密度超过1 × 1021 m−3，中心压力达到大气压的1.5倍。堆芯芯弹丸加料对于IDB的形成是绝对必要的，并且通过采用密集的多弹丸注入可重复地获得。在IDB堆芯等离子体中，尽管存在高密度和陡峭的密度梯度，但粒子扩散系数保持在相当低的水平，0.05 m2 s-1，而没有观察到向内的粒子对流速度。

An attractive high-density operational regime which is a so-called internal diffusion barrier (IDB) has been discovered in a helical divertor configuration on the Large Helical Device (LHD). The IDB is characterized by steep density gradients and the plasma profile is divided by the IDB into a high-density core plasma and a low density mantle plasma. The IDB enables the core plasma to access the high-density/high-pressure regime. The attainable central density exceeds 1 × 1021 m−3 and the central pressure reaches ≈1.5 times atmospheric pressure. Core pellet fuelling is absolutely essential for the IDB formation and it is reproducibly obtained by employing intensive multiple-pellet injection. In the IDB core plasma, the particle diffusion coefficient is kept at a considerably low level, 0.05 m2 s−1, in spite of high-density and steep-density gradients whereas an inward particle convection velocity is not observed.

High-density plasma with internal diffusion barrier in the Large Helical Device

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