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Description
This work presents the engineering design and analysis of the upgraded beta-NMR end station at the VITO beamline. The upgrade was aimed at enabling studies of air-sensitive samples in a wide range of temperatures in 4.7 T magnetic field. This led to the requirements of non-magnetic materials, ultra-high vacuum, load-lock system for sample changes, and heating and cooling capability. The redesigned system integrates a new internal motion assembly for precise sample positioning inside the magnet bore without the need to break vacuum, a modular vacuum chamber, and a dedicated sample change mechanism enabling studies on air-sensitive materials. Structural, thermal and electromagnetic simulations were performed to validate the design. An LN2 trap has been also added to reduce residual-gas load.
The upgraded setup has been already successfully used during β-NMR measurements on 8Li and 47-49K. In this poster, we present the detailed design and simulations and show the performance of the new system.