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  Glock, H.-W.; Anumula, P.; Glöckner, F.; Knobloch, J.; Pflocksch, F.; Vélez, A.: Design of the Magnetic Shield for VSR DEMO. In: Frank Zimmermann ... [Ed.] : IPAC2022 : Proceedings of the 13th International Particle Accelerator Conference, in Bangkok, Thailand, 12–17 June 2022Geneva: JACoW, 2022. - ISBN 978-3-95450-227-1, p. THPOST026/1-4
  https://accelconf.web.cern.ch/ipac2022/papers/thpost026.pdf

Open Access Version

Abstract:
The VSR DEMO module, recently under development at Helmholtz-Zentrum Berlin (HZB), will house two 4-cell 1.5 GHz superconducting RF cavities with a particularly powerful HOM damping scheme based on five waveguide HOM absorbers per cavity. A magnetic shield made of high-permeable material is needed around the cavities in order to prevent the ambient magnetic field exceeding very few μT thereby causing considerable unwanted RF losses. The shield needs to accommodate the waveguides, the fundamental power coupler, two beam pipes, two He feed / return lines, the tuner and the support structures, whilst being manufacturable and mountable. The paper discusses those difficulties and presents the matured magnetic shield design. Numerical simulations are used to evaluate the efficacy of the shield.