LIBS Successfully Monitors Ultra-Thin Boron Film Thickness
Research in China has successfully validated Laser-Induced Breakdown Spectroscopy (LIBS) as a robust methodology for the real-time, in-situ monitoring of ultra-thin boron film thickness. This capability is a critical diagnostic for managing plasma-wall interactions (PWI) in advanced nuclear fusion devices, such as Experimental Advanced Superconducting (EAST), where boronization is essential for minimizing impurities and optimizing plasma performance.
The study relied on a sophisticated LIBS setup featuring the Aryelle Echelle Spectrometer from LTB Lasertechnik Berlin for plasma emission analysis. Aryelle’s combination of high spectral resolution and exceptionally broad spectral coverage proved critical to the experiment’s success. This important capability enabled the simultaneous and precise determination of plasma temperature and electron density as key parameters for CF-LIBS.
Critically, the research established a direct, robust, and approximately linear correlation between the intensity ratio of the B/Mo signals and the measured film thickness. This definitive correlation provides a strong foundation for developing a reliable, real-time diagnostic tool essential for advancing fusion energy research.
The published paper is entitled, “Application of laser-induced breakdown spectroscopy to measure the thickness of ultra-thin boron films on molybdenum tiles.”
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