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TY - CONF AU - Checchin, M. AU - Grassellino, A. AU - Martinello, M. AU - Melnychuk, O.S. AU - Romanenko, A. AU - Sergatskov, D.A. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - Origin of Trapped Flux Caused by Quench in Superconducting Niobium Cavities J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - In this study we prove that the mechanism at the basis of quality factor degradation due to quench involves the entrapment of ambient magnetic field. The cavity quench in the absence of magnetic field does not introduce any extra losses, and a clear trend between the external field and the extra losses introduced by the quench was observed. It is demonstrated that the quality factor can be totally recovered by quenching in zero applied magnetic field. A dependence of the amount of quality factor degradation on the orientation of the magnetic field with respect to the cavity was also found. PB - JACoW CP - Geneva, Switzerland SP - 3309 EP - 3311 KW - cavity KW - superconductivity KW - niobium KW - cryogenics KW - cryomodule DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-WEPTY021 UR - http://jacow.org/ipac2015/papers/wepty021.pdf ER -