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| TUPLT069 |
Approaching to a Mono-modal Accelerating Cavity based on Photonic Band-gap Concepts
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1309 |
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- M.R. Masullo
INFN-Napoli, Napoli
- A. Andreone, E. Di Gennaro, G. Lamura
Naples University Federico II, Napoli
- F. Francomacaro, M. Panniello, V.G. Vaccaro
Naples University Federico II and INFN, Napoli
- G. Keppel, V. Palmieri, D. Tonini
INFN/LNL, Legnaro, Padova
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One of the main problem of high intensity accelerators is the presence of high order modes (HOMs) which might degrade the beam quality. Accelerating cavities require HOMs suppression while keeping high quality factor (Q) fundamental mode. Both these requirements can be hardly met in closed metallic cavities. In low frequency cases and for particular geometries it is possible to partially suppress HOMs, but at high frequencies and for superconducting cavities configuration becomes cumbersome and technically unviable. We propose here a high Q cavity based on Photonic Band Gap (PBG) concepts, operating in the microwave region. The cavity consists of a two-dimensional lattice, where posts (dielectric, metallic or superconducting) are sandwiched by two conducting plates. This sandwich exhibits two kinds of frequency bands: 'pass-bands' and 'stop-bands'. It is possible to localize modes in an equivalent cavity obtained by removing posts. These modes are localized in the 'cavity'. In this way, one can obtain a quasi-mono-modal cavity: high Q fundamental mode and HOMs falling into the pass bands. We will present the study, the optimisation and the measurements of our metallic (Copper) PBG structure working in the 2-20 GHz range. The development of a different cryogenic set-up, necessary to characterise an all superconducting or an hybrid (dielectric/metallic) structure, is under way.
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