In situ monitoring of the hydrogenic fuel inventory in plasma-facing materials (PFMs) is a key issue for the sustainable and safe operation of a magnetically confined fusion device. A laser induced breakdown spectroscopy system has been applied on the linear plasma device PSI-2 to determine the short-term retention of deuterium (D) in the most promising PFM-tungsten (W). Measurements of the fuel content were performed (a) during plasma exposure, providing the dynamic D content in W and (b) after plasma exposure, determining the outgassing of D from W in vacuum. The in situ measurement of D content in W is in the time range of about 100 minutes before plasma termination (during plasma exposure) to 240 minutes after plasma termination (after plasma exposure). The measured surface D content in W drops to 17%–37% of the initial amount (measured before the plasma is switched off), showing a reduction factor of ca. 3–6 within the first 240 minutes.

对等离子材料 (PFM) 中氢燃料库存的原位监测是磁约束聚变装置可持续和安全运行的关键问题。激光诱导击穿光谱系统已应用于线性等离子体装置 PSI-2，以确定氘 (D) 在最有前途的 PFM 钨 (W) 中的短期保留。燃料含量的测量是在 (a) 等离子体暴露期间进行的，提供 W 中的动态 D 含量和 (b) 等离子体暴露后，确定真空中 D 从 W 中的脱气。在原位W中D含量的测量在等离子体终止前(等离子体暴露期间)约100分钟至等离子体终止后(等离子体暴露后)240分钟的时间范围内。测得的 W 中表面 D 含量下降到初始量的 17%–37%（在等离子体关闭之前测量），显示出约 10% 的减少因子。前 240 分钟内 3-6 次。