| Paper |
Title |
Page |
| MOPLT060 |
New RF Measuring System for Cavity Characterization
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692 |
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- S. Stark, G. Bisoffi, l. Boscagli, V. Palmieri, A.M. Porcellato
INFN/LNL, Legnaro, Padova
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New computer based mobile measuring system for laboratory and online characterization of superconducting cavities has been put into operation at LNL. The system covers the frequency range from 80 to 350 MHz and represents a reliable, fast and precise instrument for cavity testing. The list of automatic and semiautomatic procedures includes line calibrations, frequency sweep, decay time measurement, Q(Eacc) curve acquisition and pulse conditioning.
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| TUPKF024 |
Operation Experience with ALPI Nb/Cu Resonators
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1018 |
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- A.M. Porcellato, L. Bertazzo, M. De Lazzari, D. Giora, V. Palmieri, S. Stark, F. Stivanello
INFN/LNL, Legnaro, Padova
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The refurbishing, by replacing the Pb superconducting film by Nb, of ALPI QW accelerating resonators was completed in 2003. All the 52 cavities are now in operation showing a large increase in the average accelerating field, which exceeds 4.5 MV/m (21 MV/m pick electrical surface field). The performance of renewed resonators has been increasing with time reaching 6MV/m in the last produced units. The increase in ALPI performance and the advantage in conditioning and setting time obtained by the upgrading process will be reported.
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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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