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TY - CONF AU - Völker, J. AU - Frahm, A. AU - Jankowiak, A. AU - Keckert, S. AU - Knobloch, J. AU - Kourkafas, G. AU - Kugeler, O. AU - Neumann, A. AU - Plötz, H. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - A Superconducting Magnetic Shield for the Photoelectron Injector of BERLinPro J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Magnetic fields are a big issue for SRF cavities, especially in areas with strong electromagnets or ferromagnetic materials. Magnetic shieldings consisting of metal alloys with high magnetic permeability are often used to reroute the external magnetic flux from the cavity region. Those Mu metal shields are typically designed for weak magnetic fields like Earth’s magnetic field. Next to strong magnetic field sources like superconducting (SC) solenoids, those shields can be easily saturated resulting in a degradation of the shielding efficiency and a permanent magnetization. For the photoinjector of BERLinPro a new SC solenoid will be installed inside the cryomodule next to the SRF gun cavity. Calculations show that the fringe fields of the solenoid during operation can saturate the cavity Mu-metal shields. Therefore we designed an SC magnetic shield placed between solenoid and cavity shield to protect the latter during magnet operation. In this paper we will present the design and first measurements of this SC magnetic shield. PB - JACoW Publishing CP - Geneva, Switzerland SP - 335 EP - 339 KW - solenoid KW - cavity KW - gun KW - shielding KW - operation DA - 2019/08 PY - 2019 SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP105 UR - http://jacow.org/srf2019/papers/mop105.pdf ER -