Author: Ficcadenti, L.
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MOOCA01 High Power Test Results of the SPARC C-Band Accelerating Structures 39
 
  • D. Alesini, M. Bellaveglia, M.E. Biagini, R. Boni, P. Chimenti, R. Clementi, G. Di Pirro, R. D. Di Raddo, M. Ferrario, A. Gallo, V.L. Lollo
    INFN/LNF, Frascati (Roma), Italy
  • M. Brönnimann, R. Kalt, T. Schilcher
    PSI, Villigen PSI, Switzerland
  • L. Ficcadenti
    INFN-Roma, Roma, Italy
  • L. Palumbo
    URLS, Rome, Italy
 
  The energy upgrade of the SPARC photo-injector at LNF-INFN (Italy) from 150 to more than 240 MeV will be done by replacing a low gradient S-Band accelerating structure with two C-band structures. The structures are Traveling Wave (TW) and Constant Impedance (CI), have symmetric axial input couplers and have been optimized to work with a SLED RF input pulse. In the paper we present the results of the low and high power RF tests on the two final fabricated structures that shown the feasibility of the operation at accelerating gradients larger than 35 MV/m.  
slides icon Slides MOOCA01 [6.242 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-MOOCA01  
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THPME017 Electromechanical Analysis of SCDTL Structures 3250
 
  • M. Ciambrella, F. Cardelli, M. Migliorati, A. Mostacci, L. Palumbo
    URLS, Rome, Italy
  • L. Ficcadenti, V. Pettinacci
    INFN-Roma, Roma, Italy
  • L. Picardi, C. Ronsivalle
    ENEA C.R. Frascati, Frascati (Roma), Italy
 
  The Side Coupled Drift Tube Linac (SCDTL) is a 3 GHz accelerating structure for proton therapy linac designed for TOP-IMPLART, an Intensity Modulated Proton Linear Accelerator for Radio-Therapy. The structure is made up of short DTL accelerating tanks for low current proton beams, coupled by side coupling cavities. The purpose of this paper is to report on the analysis of electromagnetic and the thermo-mechanical behavior for the SCDTL structure. The 3D electromagnetic analysis is used to derive the power dissipation on the structure; then one can infer the temperature distribution and deformation field in order to eventually evaluate their feedback on the electromagnetic properties of the structure as, for instance, the cavity resonant frequency shift. Such a "multi-physics'' analysis has been performed for different supporting stem geometries in order to optimize the shunt impedance and the R/Q for SCDTL cavities.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME017  
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THPRI042 Design and RF Test of Damped C-Band Accelerating Structures for the ELI-NP Linac 3856
 
  • D. Alesini, S. Bini, R. D. Di Raddo, V.L. Lollo, L. Pellegrino
    INFN/LNF, Frascati (Roma), Italy
  • L. Ficcadenti, V. Pettinacci
    INFN-Roma, Roma, Italy
  • L. Palumbo
    URLS, Rome, Italy
  • L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
 
  The linac energy booster of the European ELI-NP proposal foresees the use of 12 traveling wave C-Band structures, 1.8 m long with a field phase advance per cell of 2pi/3 and a repetition rate of 100 Hz. Because of the multi-bunch operation, the structures have been designed with a damping of the HOM dipoles modes in order to avoid beam break-up (BBU). They are quasi-constant gradient structures with symmetric inputs couplers and a strong damping of the HOM in each cell. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce their cost. In the paper we shortly review the whole design criteria and we illustrate the low and high power RF test results on prototypes that shown the feasibility of the structure realization and the effectiveness of the HOM damping.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI042  
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