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，高性能核心等离子体有利于低壁回收条件，所以许多现有的磁聚变实验采用壁调节技术，例如硼化，但是，本质上，由于表面饱和，这些壁调节技术的功效寿命有限。由此可见，对于未来的稳态聚变装置，必须开发可行的壁概念，以在稳态等离子体相互作用条件下保持面向等离子体组件（PFC）的表面不饱和。一个新概念PFC 采用水冷转鼓，旨在保持颗粒回收率 <100%，已使用稳态线性磁化等离子体装置在密度约为 10^<11> 1/cc 和电子温度约为 10 eV 的等离子体轰击下进行了检查。旋转鼓不断用钛改进，沉积速率约为 10Å/s，并且通过光谱监测 H_α 的强度。实验结果表明，氢回收率降低至即使在稳定状态下，零维粒子平衡模型也已开发出来，并使用保守的文献数据很好地再现了实验数据。下一步，研究流动液体（金属）作为介质的可能性。 PFC，该实验设施已被修改为可以水平或垂直引导等离子体流，因为这是一种独一无二的设施，并且已在几家全国范围内废除的报纸上进行了报道。 .该设施的现状是所有等离子体诊断装置都经过了各自的功能测试，并且第一个液态锂实验已经完成。