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- M.R. Masullo
INFN-Napoli, Napoli
- A. Andreone, E. Di Gennaro, F. Francomacaro, G. Lamura
Naples University Federico II, Napoli
- V. Palmieri, D. Tonini
INFN/LNL, Legnaro, Padova
- M. Panniello, V.G. Vaccaro
Naples University Federico II and INFN, Napoli
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We have realized normal conducting and superconducting open resonators based on the Photonic Band Gap (PBG) concept. We present the study, the optimisation and the measurements (from room temperature to 1.5 K) of Copper and Niobium PBG accelerating cavities operating at two different frequencies, 6 GHz and 16 GHz. All the structures are realised by extruding a single bulk piece of material, using a new machining method that minimizes the surface losses caused by the contact between different conducting parts. Measurements on the compact (54 mm external diameter) 16 GHz Nb structure are very good, showing in the superconducting state a quality factor Q =1.2x105 at the lowest temperature (1.5 K), limited by radiation losses only. The shunt impedance measured for the 16 GHz prototype is 70 MOhm/m, underlining the applicability of such resonant structures as accelerating cavities.
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