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TY - CONF AU - Bertucci, M. AU - Bignami, A. AU - Bosotti, A. AU - Chen, J.F. AU - Maiano, C.G. AU - Michelato, P. AU - Monaco, L. AU - Pagani, C. AU - Paparella, R. AU - Pierini, P. AU - Sertore, D. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - In-Depth Analysis of the Vertical Test Results of the Third-Harmonic Cavities for the E-XFEL Injector J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The results of the vertical tests performed at LASA on the 3.9 GHz third-harmonic cavities for the E-XFEL injector are here discussed. Analysis of experimental data allows to confirm that such high frequency cavity, prepared with standard BCP treatment and 800°C annealing treatment, suffers an intrinsic performance limitation at around 22 MV/m (@ 2 K) due to a global thermal dissipation mechanism. A quantitative interpretation of the high field Q slope is also presented according to the latest theoretical models of field-dependent surface resistance. PB - JACoW Publishing CP - Geneva, Switzerland SP - 2644 EP - 2647 KW - cavity KW - FEL KW - experiment KW - feedback KW - SRF DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-WEPMK008 UR - http://jacow.org/ipac2018/papers/wepmk008.pdf ER -