The first joint LID-QMS/LIBS meeting for fusion diagnostics took place at ENEA in Frascati from December 9 to 12, 2025. The event brought together nearly 20 leading researchers in the fields of Laser-Induced Desorption Mass Spectrometry (LID-QMS) and Laser-Induced Breakdown Spectroscopy (LIBS) to discuss recent advancements in data analysis and quantification of LID-QMS and LIBS data collected during the experiments following the DTE3 campaign at JET in 2023-2024.
A key focus of the meeting was to advance fuel retention and surface composition analysis for inner divertor tiles using LIBS and LID-QMS diagnostics. This was achieved by comparing results and reviewing calibration approaches to produce quantified results. The agenda also addressed significant topics, such as the principles of both diagnostic techniques, analysis of large-scale datasets using AI and ML, and a new ex-situ LIBS experiment planned for execution in 2026.
Successes of the meeting include:
- Identification of similar fuel retention trends across tiles when comparing LID-QMS and LIBS results.
- Successful quantification of LIBS data using a calibration-free method.
- First quantitative comparison of hydrogen isotope concentrations between LID-QMS and LIBS, showing good agreement.
- Further development of LID-QMS analysis procedures, reducing uncertainty in fuel retention quantification by accounting for pumping conditions.
- Advancements in machine learning algorithms for hydrogen isotope analysis in LIBS data.
- Alignment and convergence in LIBS depth profiling among different data analysis teams.
Publications in this topic:
- Zlobinski et al, First results of Laser-Induced Desorption – Quadrupole Mass Spectrometry (LID-QMS) at JET. Nuclear Fusion 64 (2024) 086031. https://doi.org/10.1088/1741-4326/AD52A5J.
- Likonen et al, First Demonstration of Laser Induced Breakdown Spectroscopy using Remote Handling for In-vessel Analysis of JET Components, Nuclear Materials and Energy 45 (2025) 102021.
