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TY - CONF AU - Peauger, F. AU - Bosland, P. AU - Carbonnier, P. AU - Darve, C. AU - Devanz, G. AU - Hanus, X. AU - Hardy, P. AU - Hennion, V.M. AU - Maurice, L. AU - Molloy, S. AU - Olivier, G. AU - Plouin, J. AU - Roudier, D. AU - Servouin, C. AU - Éozénou, F. ED - Petit-Jean-Genaz, Christine ED - Arduini, Gianluigi ED - Michel, Peter ED - Schaa, Volker RW TI - Status and First Results of Two High Beta Prototype Elliptical Cavities for ESS J2 - Proc. of IPAC2014, Dresden, Germany, June 15-20, 2014 C1 - Dresden, Germany T2 - International Particle Accelerator Conference T3 - 5 LA - english AB - Two prototypes of elliptical superconducting cavities have been designed and manufactured in the frame of the French-Swedish agreement for ESS. These 5-cell cavities have a beta value of 0.86 and their frequency is 704.42 MHz. The nominal accelerating gradient on the ESS accelerator is 19.9 MV/m at 2K. We present the manufacturing status of the cavities by two different vendors as well as the specific means which have been developed for the cavity treatments performed at CEA after delivery. We emphasis the activities performed on the first bare cavities recently received at CEA such as the RF measurement and tuning operations, the cleaning and chemical treatments and the clean room assembly including high pressure rinsing. Finally, first test results at 2K in vertical cryostat are reported. PB - JACoW CP - Geneva, Switzerland SP - 2477 EP - 2479 KW - cavity KW - cryomodule KW - accelerating-gradient KW - operation KW - niobium DA - 2014/07 PY - 2014 SN - 978-3-95450-132-8 DO - 10.18429/JACoW-IPAC2014-WEPRI002 UR - http://jacow.org/ipac2014/papers/wepri002.pdf ER -