Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 9: Plasma Wall Interaction

P 9.1: Hauptvortrag

Dienstag, 1. April 2025, 16:15–16:45, ZHG102

In-vessel and depth-resolved hydrogen isotope composition analysis in JET by LIBS operated on a remote handling arm — •Rongxing Yi¹, Rahul Rayaprolu¹, Gennady Sergienko¹, Erik Wuest¹, Marc Sackers¹, Timo Dittmar¹, and Sebastijan Brezinsek^1,2 — ¹Forschungszentrum Jülich GmbH, IFN-1 Plasmaphysics, Jülich, GERMANY — ²HHU Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf, GERMANY

As the world's most successful Tokamak, JET achieved a groundbreaking milestone in nuclear fusion during its final deuterium-tritium experimental campaign (DTE-3) last year by setting a new world energy record. However, one critical safety aspect, the fuel retention distribution within the vessel walls after DTE-3, remains an unresolved challenge. To resolve it, a laser-induced breakdown spectroscopy (LIBS) system has been deployed. Compactly integrated into a laptop-sized box, the setup is mounted on a remote handling arm inside the JET vessel. Spectral data collected through this system is transmitted via long optical fibers to multiple spectrometers for analysis. The laser achieves a surface and depth resolution of 130 μm and 180 nm on tungsten, respectively. Additionally, a high-flux Littrow spectrometer gives high sensitivity for detecting hydrogen isotopes. By utilizing the remote handling arm with the LIBS setup, over 800 positions were analyzed within the vessel, providing both global distribution and depth profiles of retained hydrogen isotopes.This approach represents a method in understanding fuel retention, crucial for improving the safety and wall material design of future fusion reactors.

Keywords: JET; Remote arm; LIBS; Hydrogen isotope; Depth-resolved