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

因为众所周知，高性能核心等离子体有利于低壁循环条件，许多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，这些壁面调节技术具有有限的有效寿命。由此得出的结论是，对于未来的稳态聚变装置，必须开发使能壁概念，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。在本研究项目中，使用稳态线性磁化等离子体装置，研究了一种新的PFC概念，该概念采用水冷旋转鼓，旨在保持颗粒回收<100%。在密度约为10^<11> 1/cc、电子温度约为10 eV的等离子体轰击下，以10Å/s左右的沉积速率对旋转鼓进行了钛的持续改性，并用光谱法监测了H_α的强度。实验结果表明，即使在稳态下，氢气的再循环率也降低到94%。建立了一个零维粒子平衡模型，并将保守的文献数据代入该模型，较好地再现了实验数据。下一步，为了检验流动液体（金属）作为PFC的可能用途，实验设备已经被修改，使等离子体流动可以水平或垂直方向。因为这是一个独一无二的设施，并且在全国范围内发行的报纸上都有报道。该设施目前的状况是，所有的等离子体诊断都已进行了自身功能的测试，并进行了第一次液体锂实验。

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.