Speaker
Description
The TIGER project comprises the development, construction, and commissioning of the world's first thermal MIEZE spin-echo option at the resonant neutron spin-echo spectrometer RESEDA. Its objective is to extend the accessible parameter range of RESEDA towards higher momentum and energy transfers while maintaining the highest energy resolution through the additional use of thermal neutrons with wavelengths down to 2 Å.
Operation of the system requires an additional polarizer specifically designed for thermal neutrons, which will be placed vertically above the present polarizer for cold neutrons. In addition, the setup incorporates a vertical drive mechanism for positioning the two vertically stacked polarizers. During each automated exchange, the final position of each polarizer relative to the neutron guide must be reached with high precision and reproducibility. A positioning tolerance of ±50 µm in the x-, y-, and z-directions must be maintained.
To ensure this level of accuracy, the drive mechanism must be mounted on a mechanically rigid support structure. This support must remain mechanically decoupled from all RESEDA components, as even minor vibrations or the assembly and disassembly of the lead shielding surrounding the neutron guide could result in misalignment of the system. Furthermore, the entire assembly requires a high degree of structural stiffness to guarantee precise and reproducible positioning of the polarizers.
The vertical drive is based on the lifgo rack-and-pinion lifting gearbox manufactured by Leantechnik. Featuring a linearly guided rack, the system is particularly well suited for fast, precise, and synchronized linear motion.
The poster presents the design of the TIGER polarizer exchange system and discusses the overall project workflow, the development of the translational motion unit, and the engineering solutions implemented to meet the scientific and technical requirements.
Key Words
TIGER, MIEZE, NRSE, RESEDA, Thermal Neutrons, Polarizer Exchange System,