47 Ziegler, Philipp Lechner, Anton Lindstrom, Bjorn Wiesner, Christoph Hernalsteens, Cédric Valuch, Daniel Wollmann, Daniel Gancarcik, David Calvo Giraldo, Eva Sterbini, Guido Podlech, Holger Gonzalez Berges, Manuel Hostettler, Michi Belanger, Philippe Schmidt, Ruediger Kostoglou, Sofia Coco, Victor Buffat, Xavier FHF 16th International Particle Accelerator Conference JACoW Publishing Taipei, Taiwan 10.18429/JACOW-IPAC2025-MOPM021 English 330-333 Interactions of dust grains with the LHC beams cause beam losses that can trigger premature beam aborts or even quenches of superconducting dipoles. While the simulated motion and ionisation of dust grains inside the proton beam are in good agreement with measured beam-loss data, a direct measurement of the dust movement is not available. A novel method was developed that reconstructs the trajectory of a dust grain based on the different beam loss profiles of transversely displaced bunches. A proof-of-principle experiment to validate the method using a thin wire to simulate the dust grain was performed in June 2024 at the LHC. This paper describes the beam experiment, compares the achieved displacements with simulations, and shows the reconstructed trajectories. Finally, it is discussed how the method can be applied for real dust events occurring during LHC operation. Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. This work has been sponsored by the Wolfgang Gentner Programme of the German Federal Ministry of Education and Research (grant no. 13E18CHA). ; 33, ; PUB:(DE-HGF)8, ; Accelerator Physics mc1-colliders-and-related-accelerators - MC1 :Colliders and Related Accelerators MC1.A01 - MC1.A01 Hadron Colliders Contribution to a conference proceedings 2025 2025-06-01 - 2025-06-06 GSI-2026-00266 2025-06-01 - 2025-06-06 2025 https://repository.gsi.de/record/364087 https://doi.org/10.18429/JACOW-IPAC2025-MOPM021