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TY - UNPB AU - Macpherson, A. ED - Meseck, Atoosa ED - McAteer, Meghan ED - Schaa, Volker R.W. ED - V\xF6lker, Jens TI - High Q 704 MHz Cavity Tests at CERN J2 - Proc. of ERL2019, Berlin, Germany, 15-20 September 2019 CY - Berlin, Germany T2 - ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs T3 - 63 LA - english AB - Results from CERN’s bulk niobium high-gradient cavity development program at CERN are presented, with particular focus on evolution of RF performance 704 MHz bulk niobium 5-cell elliptical cavity prototypes originally produced for the Superconducting Proton Linac (SPL) project. Successive cold tests of bare cavities have been used to refine the cavity preparation and testing process, with all steps done in-house at CERN, and reproducible RF performance well above SPL specifications has been achieved. Current performance results are discussed in relation to cavity preparation and cold tests procedures, with reference to direct observables such as expelled flux and thermal gradients during cool down, field emission characteristics, and quench diagnostics. In addition, the processing of raw RF data from single pulse measurements to extract RF performance figures of merit will be presented, offering an alternative approach to assessing RF performance. PB - JACoW Publishing CP - Geneva, Switzerland ER -