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Relation between a plasma confinement improvement due to internal transport barrier formation and the effects of sheared flows on the suppression of turbulent vortices

由于内部传输势垒形成而改善的等离子体约束与剪切流对湍流涡流抑制的影响之间的关系

基本信息

批准号：
18360441
负责人：
CHO Teruji
金额：
$ 7.58万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Anomalous particle and energy cross-field transport is one of the most critical issues in magnetic plasma confinement for fusion, as well as in the physics of magnetized plasmas in general. In magnetic confinement systems with different magnetic-field topologies (e. g., tokamaks, stellarators, and mirrors), recent experiment shave shown that low-frequency (LF) turbulence and the associated anomalous cross-field plasma transport exhibit rather common features including high-confinement (H) mode transition sand internal transport-barrier (ITB) formation.The controlled formation of an internal transport barrier is investigated. The barrier is localized within a layer of a strongly sheared E_r×B plasma rotation. This high-vorticity layer is anticipated to be formed and maintained by plasma heating, which generates a layer with a partial loss of electrons that modifies the initial Gaussian radial potential profile into a non-monotonic one with a hump structure. The local gradients of T_I and T_e are also expected to be enhanced in the ITB layer, similarly to those of the ITB in tokamaks and stellarators. Reductions in the effective ion and electron thermal diffusivities are thus anticipated in the barrier layer A reduction of the observed low-frequency turbulence in the ITB layer and a partial decoupling of the turbulent structures localized on either side of the layer are demonstrated. Recently, we have obtained the ideas of various controlled methods, although unexpected matters disturbed their reports. These new methods will be extended in future.Such externally controlled transport barrier formation is of great importance for the fusion plasma upgrade including ITER plasmas in terms of the active control of the internal transport barrier formation.

异常粒子和能量跨场输运是磁等离子体约束聚变以及磁化等离子体物理中最关键的问题之一。在具有不同磁场拓扑结构的磁约束系统中（例如，例如，在一个实施例中，托卡马克、仿星器和反射镜等离子体中低频湍流和与之相关的反常交叉场输运具有一些共同的特征，包括高约束（H）模跃迁和内输运势垒（ITB）的形成.势垒位于一层强烈剪切的E_r×B等离子体旋转中。预计该高涡度层将通过等离子体加热形成并维持，等离子体加热产生具有部分电子损失的层，该层将初始高斯径向势分布修改为具有驼峰结构的非单调分布。与托卡马克和仿星器中的ITB相似，ITB层中的T_I和T_e的局部梯度也有望得到增强。因此，预计在有效的离子和电子的热扩散率的减少在阻挡层A减少所观察到的低频湍流在ITB层和局部的湍流结构的层的两侧的部分去耦被证明。最近，我们获得了各种控制方法的想法，尽管意外的事情扰乱了他们的报告。这种外控输运势垒的形成对于包括ITER等离子体在内的聚变等离子体升级具有重要意义。

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Simultaneous Measurements of Ion and Electron Currents Using a Novel Compact Electrostatic End-Loss-Current Detector

使用新型紧凑型静电端损电流检测器同时测量离子和电子电流

DOI：
发表时间：
2006
期刊：
Review of Scientific Instruments Vol. 77,No. 10
影响因子：
0
作者：
Hoshino;M.;Kimata;M.;Arakawa;Y.;Nishida;N. and Shimizu;M.;M.Hirata et al.
通讯作者：
M.Hirata et al.

Investigation of Electron Distribution Functions in the Plug Region of the GAMMA 10 Tandem Mirror

GAMMA 10 串联镜插头区域电子分布函数的研究

DOI：
发表时间：
2007
期刊：
Transacitions of Fusion Science and Technology 51
影响因子：
0
作者：
J.;Kohagura;et. al.
通讯作者：
et. al.

Experimental estimation of the local energy balance of the potential-confinig electrons in tandem-mirror plasmas

串联镜等离子体中势域电子局部能量平衡的实验估计

DOI：
发表时间：
2006
期刊：
Review of Scientific Instruments Vol.77,No.10
影响因子：
0
作者：
K. Ogura;et. al.;T.Cho et al.;T.Cho et al.;M.Hirata et al.;J.Kohagura et al.;T.Numakura et al.
通讯作者：
T.Numakura et al.

Study of Electric-Field-Shear Effects on Turbulence Suppression with Confinement Improvement using X-ray Diagnostics in GAMMA 10

使用 GAMMA 10 中的 X 射线诊断研究电场剪切对湍流抑制和约束改进的影响