In order to try to improve spectral separation for hydrogen isotope detection in plasma facing components, a flow of noble gas at reduced pressure is proposed as alternative to atmospheric pressure experiments in air during maintenance of fusion vessels. To this aim the already realized compact LIBS probe has been equipped with a sealable tip where a noble gas could flow. The tip was in contact with the selected point of the target and its proper positioning was guaranteed by an adjustable metallic cone. Laboratory measurements were carried out by flowing either He or Ar on ITER-like tiles. A positive effect of Ar flow on H_α signal intensity was observed, while a significant narrowing of the H_α band was obtained upon He addition.

Additional measurements on deuterium doped samples simulating the tile's composition in ITER divertor region were performed by applying a local vacuum in the point of analysis or utilizing the set-up in double pulse (DP) mode. These experiments were aimed at optimizing the acquisition parameters of the LIBS setup (e.g, single or double pulse excitation, gate delay, gate width, interpulse delay) when operated in different conditions (vacuum, atmospheric pressure, under gas flow) in order to resolve the two nearby emission bands H_α and D_α, still preserving a satisfactory Signal-to-Noise-Ratio (SNR). Finally, considerations on applicability of Calibration Free (CF) method for the quantification of hydrogen isotopes are presented.

为了尝试改进面向等离子体组件中氢同位素检测的光谱分离，建议在聚变容器维护期间使用减压惰性气体流作为空气中大气压实验的替代方法。为此，已经实现的紧凑型 LIBS 探针配备了可密封的尖端，惰性气体可以在其中流动。尖端与目标的选定点接触，其正确定位由可调节的金属锥体保证。实验室测量是通过在类似 ITER 的瓷砖上流动 He 或 Ar 来进行的。观察到 Ar 流对 H _α信号强度的积极影响，而在添加 He 后H _α带显着变窄。

通过在分析点施加局部真空或利用双脉冲 (DP) 模式中的设置，对模拟 ITER 偏滤器区域中瓷砖成分的掺氘样品进行了额外测量。这些实验旨在优化在不同条件（真空、大气压、气流下）下操作时 LIBS 设置的采集参数（例如，单脉冲或双脉冲激发、门延迟、门宽度、脉冲间延迟），以解决两个附近的发射带 H _α和 D _α，仍然保持令人满意的信噪比（SNR）。最后，提出了关于量化氢同位素的无校准 (CF) 方法适用性的考虑因素。