Investigation of carbon impurity transport in plasmas by using 13CH4

为了了解碳从侵蚀到沉积的迁移过程，注入了~(13)&gt；CH_4，并研究了~(13)&gt；C的分布。结果表明，含H原子的13&gt；C达到了13&gt；CH4喷口前方的碳砖。因此，~(13)C的输运过程可能如下：~(13)CH_4既不解离成~(13)C和H，也不电离，也不沿磁力线行进。而~(13)&gt；CH_4则以^&lt；13&gt；CH_x(x=1-4)的形式与碳砖反复粘连和再发射，到达喷口前方的碳砖上。

In order to understand the transport of carbon, from erosion to deposition,^<13> CH_4 was injected, and the distribution of the deposited^<13> C was investigated. It was found that^<13> C reached, with H atoms, the carbon tiles in front of the^<13> CH_4 injection port. Hence possible transport process of^<13> C is as follows ;^<13> CH_4 neither dissociated into^<13> C and H, nor ionized, nor traveled along the magnetic field lines. But^<13> CH_4 repeated sticking and reemission with carbon tiles and reached the carbon tile in front of the injection port in the form of^<13> CH_x(x=1-4).