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Proof-of-principle experiments on the particle control capability of the moving -surface plasma-facing component concept.

针对移动表面等离子体组件概念的粒子控制能力的原理验证实验。

基本信息

批准号：
13680574
负责人：
HIROOKA Yoshihiko
金额：
$ 2.18万
依托单位：
National Institute for Fusion Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Because it is well known that high-performance core plasma favors low wall recycling conditions, a number of existing magnetic fusion experiments employ wall conditioning techniques such as boronization. However, by nature these wall conditioning techniques have finite lifetime of efficacy due to the surface saturation with implanted fuel and impurity particles. It follows immediately from this that for future steady state fusion devices, enabling wall concepts must be developed to maintain surfaces of plasma-facing components (PFCs) unsaturated under steady state plasma interaction conditions.In this research program, a new concept of PFC, employing a water-cooled rotating drum intended to maintain particle recycling <100% has been examined using a steady state linearly magnetized plasma device. Under plasma bombardment with densities around 10^<11> 1/cc and electron temperatures around 10 eV, the rotating drum was continuously Bettered with titanium, at deposition rates around 10Å/s and the intensity of H_α was monitored with spectroscopy. Experimental results indicate that hydrogen recycling is reduced down to 94% even at steady state. A zero-dimensional particle balance model has been developed and reproduced the experimental data quite well using conservative literature data substituted into it.As the next step, to examine the possible use of flowing liquid (metals) as a PFC, the experimental facility has been modified in such a way that the plasma flow can be directed either horizontally or vertically. Because this is a one-of-a-kind facility, and has been reported in a couple of nation-wide circulated newspaper. The present status of this facility is that all the plasma diagnostics have been tested for their own functions and the first liquid lithium experiments have been done.

因为众所周知，高性能的核心等离子体有利于低壁再循环条件，一些现有的磁聚变实验采用壁调节技术，如硼化。然而，由于注入燃料和杂质颗粒的表面饱和，这些壁调节技术本质上具有有限的有效寿命。因此，对于未来的稳态聚变装置，必须发展使能壁的概念，以保持面向等离子体组件（PFC）的表面不饱和的稳态等离子体相互作用conditions.In本研究计划中，PFC的一个新概念，采用水冷旋转鼓旨在保持粒子回收<100%已使用稳态线性磁化等离子体装置进行了检查。在等离子体密度约为10^<11>1/cc、电子温度约为10 eV的条件下，以约10 μ s/s的沉积速率对转鼓进行连续的钛离子轰击，用光谱仪监测H_α的强度。实验结果表明，即使在稳定状态下，氢气的再循环也降低到94%。一个零维粒子平衡模型已经开发和再现的实验数据相当不错，使用保守的文献数据代入它。作为下一步，检查可能使用的流动液体（金属）作为PFC，实验设备已被修改，在这样一种方式，等离子体流可以被定向为水平或垂直。因为这是一个独一无二的设施，并已报道了一对夫妇的全国范围内发行的报纸。该设施目前的状况是，所有的等离子体诊断都已经测试了它们自己的功能，并且已经完成了第一次液体锂实验。