Characterization of edge radial electric field structures in the Large Helical Device and their viability for determining the location of the plasma boundary
Characterization of edge radial electric field structures in the Large Helical Device and their viability for determining the location of the plasma boundary
复制标题
大型螺旋装置中边缘径向电场结构的表征及其确定等离子体边界位置的可行性
DOI：
10.1088/0029-5515/53/1/013003
复制
发表时间：
2012
期刊：
影响因子：
3.3
通讯作者：
M. Yokoyama
中科院分区：
文献类型：
--
作者：
K. Kamiya;K. Ida;M. Yoshinuma;C. Suzuki;Y. Suzuki;M. Yokoyama
本文系统地研究了等离子体条件(磁组态、碰撞性和β)对大型螺旋装置中电荷交换光谱测量得到的边缘径向电场(ER)结构的影响。我们发现，随着体积平均等离子体β(等离子体压力与磁压之比，∇)变大，Er结构中的空间导数(β≡<β，Er)具有局部最大值的位置从真空最后封闭的磁通表面位置向外移动。电子在开放场线上的损失，留下离子，可能是决定等离子体边界外正Er结构的物理原因。实验观察到的等离子体边界内Er值的对撞性依赖关系符合新经典双极条件，而等离子体边界外的Er形成与新经典理论预测的趋势不同。此外，还给出了即使在较高的β区(3%⩽β⩽4.5%)位置移位饱和的实验数据，从而推断和预测了较高的β区的等离子体收缩(即平均小半径减小)，其中沙夫洛夫移位变得更大。
This paper provides a systematic investigation on how plasma conditions (magnetic configuration, collisionality and beta) affect the edge radial electric field (Er) structure derived from charge exchange spectroscopic measurements in the Large Helical Device. We found that the location at which the spatial derivative in the Er structure (∇Er) had a local maximum value shifts outwards from the vacuum last closed flux surface location as the volume-averaged plasma beta (the ratio of the plasma pressure to the magnetic pressure, β ≡ 〈βdia〉 measured by a diamagnetic loop) becomes large. The loss of electrons on the open field lines, leaving the ions behind, might be the physics that determines the positive Er structure just outside the plasma boundary. The collisionality dependence of the experimentally observed Er values inside the plasma boundary is found to be consistent with a neoclassical ambipolar condition, while the Er formation outside the plasma boundary is different from the trend that is predicted by the neoclassical theory inside the plasma boundary. Furthermore, experimental data on saturation in the shift of the location even in a higher β regime (3% ⩽ β ⩽ 4.5%) are presented, inferring and predicting shrinkage of the plasma (i.e. a reduction in the averaged minor radius) in the higher β regime in which the Shafranov shift becomes larger.
影响因子：
3.3
作者：
Ida, K.;Yoshinuma, M.;Kaneko, O.
通讯作者：
Kaneko, O.
“具有螺旋偏滤器配置的日光管等离子体中的 β 导致等离子体边界的变化”
DOI：
--
发表时间：
2007
期刊：
Plasma Physics and Controlled Fusion 49.5
影响因子：
--
作者：
M. Goto;et. al.;K.Y.Watanbe
通讯作者：
K.Y.Watanbe
影响因子：
3.3
作者：
K. Ida;M. Yoshinuma;M. Yokoyama;S. Inagaki;N. Tamura;B. Peterson;T. Morisaki;S. Masuzaki;A. Komori;Y. Nagayama;K. Tanaka;K. Narihara;K. Watanabe;C. Beidler
通讯作者：
K. Ida;M. Yoshinuma;M. Yokoyama;S. Inagaki;N. Tamura;B. Peterson;T. Morisaki;S. Masuzaki;A. Komori;Y. Nagayama;K. Tanaka;K. Narihara;K. Watanabe;C. Beidler