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TY - CONF AU - Nuñez von Voigt, P. AU - Knobloch, J. AU - Kugeler, O. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Investigation of Trapped Flux Dynamics via DC-Magnetic Quenching 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 - Trapped magnetic flux increases the surface resistance in superconducting radio-frequency cavities. A better understanding of its behaviour could help to develop a method of expelling trapped flux from the superconducting surface. Using a superconducting coil with ferrite core attached to a 3 GHz sample Niobium cavity fully immersed in liquid Helium, we were able to subject the cavity walls to unusually large magnetic fields (estimated > 150 mT) and create magnetic quenches. With Fluxgate sensors attached in three spatial directions inside the cavity, we were able to monitor the quench dynamics and extract parameters of the flux dynamics from the hysteretic behaviour of the measured fields resulting from the applied coil current. First results of manipulation of the trapped flux with high magnetic fields are presented. PB - JACoW Publishing CP - Geneva, Switzerland SP - 580 EP - 582 KW - cavity KW - experiment KW - superconducting-cavity KW - ECR KW - SRF DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-TUP059 UR - http://jacow.org/srf2019/papers/tup059.pdf ER -