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TY - CONF AU - Bertucci, M. AU - Bignami, A. AU - Bosotti, A. AU - Chen, J.F. AU - Ciovati, G. AU - Maiano, C.G. AU - Michelato, P. AU - Monaco, L. AU - Myneni, G.R. AU - Pagani, C. AU - Paparella, R. AU - Pierini, P. AU - Sertore, D. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Test, Diagnostics and Computed Tomographic Inspection of a Large Grain 3.9 GHz Prototype Cavity J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - A large grain 3.9 GHz prototype cavity made of RRR = 10⁵ ±10 has been tested at LASA. The cavity suffered of quench at moderate levels of accelerating field, for all nine fundamental pass-band modes. Several diagnostic techniques have been employed to determine the quench positions, which occur close to significant grain-boundary steps, visible from the external cavity surface. The cavity has been scanned with a high resolution X-ray tomographic machine, confirming the existence of remarkable topographic features on the inner RF surface at the suspected quench positions. A strategy for a future surface treatment for recover the cavity performances is here presented. PB - JACoW CP - Geneva, Switzerland SP - 1011 EP - 1014 KW - cavity KW - niobium KW - SRF KW - diagnostics KW - radio-frequency DA - 2017/05 PY - 2017 SN - 978-3-95450-182-3 DO - 10.18429/JACoW-IPAC2017-MOPVA062 UR - http://jacow.org/ipac2017/papers/mopva062.pdf ER -