Abstract:

The graphite tiles, located at the lower divertor and the fixed limiter of HL-2A tokamak, were measured with ex-situ laser-induced breakdown spectroscopy (LIBS). The deposition behavior on HL-2A was presented by analyzing different elements including C, Fe, Si, H and D within the tiles and their distributions on depth in different tiles. Comparing with the results obtained with time of flight secondary ion mass spectrometry (TOF-SIMS), the depth profiles show well consistency. According to the effective number of deposition layer erased by the laser, the average laser ablation rate is estimated to be 270nm/pulse.

Key words: Laser-induced breakdown spectroscopy, Graphite tile, HL-2A divertor, Plasma-material interaction

摘要：

对HL-2A 偏滤器靶板和固定孔栏位置的石墨瓦进行了离线激光诱导击穿光谱(LIBS)测量，比较分析了沉积行为，初步得到了不同位置沉积层粒子种类(Fe、Si、H、D 等元素)及其深度的变化。与飞行时间二次离子质谱仪(TOF-SIMS)所得结果进行了对比，发现离子深度变化形貌趋同。根据沉积层有效信号激光数，得到激光烧蚀速率约为270nm/脉冲。

关键词: 激光诱导击穿光谱, 石墨, HL-2A 偏滤器, 等离子体与材料相互作用