Speakers
Description
The ALBA Synchrotron upgrade into the diffraction-limited ALBA II storage ring is currently in progress and scheduled for completion before the decade’s end. Delivering a twenty-fold reduction in emittance implies a new multibend-achromat lattice with more than twice the current number of magnets. Although the existing tunnel and infrastructure will be reused, a new girder system is required that copes with the high demanding requirements on magnets stability and position tolerances, ranging 10-50 µm between adjacent magnets, and allows magnets re-alignment to compensate long-term slab deformations. To validate the vibrational stability and alignment strategies under realistic conditions, two full-scale girder prototypes have been constructed and installed in a dedicated mock-up area. The prototypes consist of two different frames installed on identical steel plinths, along with an additional granite plinth for compare the performance of this material and specific construction method. The prototypes include a set of dummy magnets, with different supports and alignment mechanisms. A comprehensive measurement campaign has been conducted to evaluate vibrational stability, alignment reproducibility, tolerances deviations during transportation and overall integration workflow. The results provide direct comparison between different girder configurations and quantify the performance of the various alignment systems, being an essential input for finalizing the ALBA II girder design.
Funding Agency
Work supported by the Spanish MCIN and Catalan Government, and co-funded by the European Union – NextGenerationEU project ICTS-MRR-2021-02-CELLS from the Recovery and Resilience Mechanism.
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