Author: Bellaveglia, M.
Paper Title Page
MOPMW004 Realization and High Power Tests of Damped C-Band Accelerating Structures for the ELI-NP Linac 399
 
  • D. Alesini, M. Bellaveglia, S. Bini, R. Boni, P. Chimenti, F. Cioeta, R.D. Di Raddo, A. Falone, A. Gallo, V.L. Lollo, L. Palumbo, S. Pioli, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • F. Cardelli, M. Magi, A. Mostacci, L. Palumbo, L. Piersanti
    University of Rome La Sapienza, Rome, Italy
  • F. Cardelli, L. Piersanti
    INFN-Roma1, Rome, Italy
  • P. Favaron, F. Poletto
    INFN/LNL, Legnaro (PD), Italy
  • L. Ficcadenti, F. Pellegrino, V. Pettinacci
    INFN-Roma, Roma, Italy
 
  The ELI-NP C-Band structures are 1.8 m long travelling wave accelerating structures, quasi-constant gradient, with a field phase advance per cell of 2pi/3. They operate at a repetition rate of 100 Hz and, because of the multi-bunch operation, they have been designed with a dipole HOM damping system to avoid beam break-up (BBU). The structures have symmetric input and output couplers and integrate, in each cell, a waveguide HOM damping systems with silicon carbide RF absorbers. An optimization of the electromagnetic and mechanical design has been done to simplify the fabrication and to reduce their cost. After the first full scale prototype successfully tested at the nominal gradient of 33 MV/m, the production of the twelve structures started. In the paper we illustrate the main design criteria, the realization process and the high power test results.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW004  
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MOPMW006 The RF System of the ELI-NP Gamma Beam Source 407
 
  • L. Piersanti, F. Cardelli, L. Palumbo
    INFN-Roma1, Rome, Italy
  • D. Alesini, M. Bellaveglia, R. Boni, A. Gallo, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • F. Cardelli, L. Palumbo, L. Piersanti
    University of Rome La Sapienza, Rome, Italy
  • G. D'Auria
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  ELI-NP is a linac based gamma-source under construction in Magurele (RO) by the European consortium EuroGammaS led by INFN. Photons with tunable energy (from 0.2 to 19.5 MeV) and with unprecedented intensity and brilliance will be produced by Compton back-scattering between a high quality electron beam (up to 740 MeV), and a 515 nm intense laser pulse. In order to increase the gamma photon flux, the accelerator will operate in multi-bunch at 100 Hz repetition rate, with 32 bunches separated by 16 ns. Three S-band (2856 MHz) RF power plants will feed two room temperature Travelling Wave (TW) structures, a 1.6 cell Standing Wave (SW) S-band gun (which has been manufactured by means of a new technique based on clamped gaskets without brazing) and two SW RF deflectors for longitudinal beam diagnostics. Ten C-band (5712 MHz) RF power plants will feed 12 TW high-order-modes (HOM) damped structures. In this paper, we review the whole ELI-NP RF architecture including the Low Level RF (LLRF) system.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW006  
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TUPOW004 Status of the STAR Project 1747
 
  • A. Bacci, I. Drebot, L. Serafini, V. Torri
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • R.G. Agostino, R. Barberis, M. Ghedini, F. Martire, C. Pace
    UNICAL, Arcavacata di Rende, Italy
  • D. Alesini, M. Bellaveglia, J.J. Beltrano, F.G. Bisesto, G. Borgese, B. Buonomo, G. Di Pirro, G. Di Raddo, A. Esposito, A. Gallo, A. Ghigo, F. Iungo, L. Pellegrino, A. Stella, C. Vaccarezza
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • G. D'Auria, A. Fabris, M. Marazzi
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • V. Petrillo
    Universita' degli Studi di Milano, Milano, Italy
  • E. Puppin
    Politecnico/Milano, Milano, Italy
  • M. Rossetti Conti
    Universita' degli Studi di Milano & INFN, Milano, Italy
 
  This paper reports on the final design and the work in progress on the STAR project (IPAC2014:WEPRO115), which is under construction at the Univ. of Calabria (Italy). The project is devoted to the construction of an advanced Thomson source of monochromatic tunable, ps-long, polarized X-ray beams, ranging from 40 up to 140 KeV . At present the buildings and main plants have been completed as the acquisition of main components: the RF photo-injector, the accelerating section, laser systems for collision and photo-cathode, RF Power Source and magnets are ready to start installation and site acceptance tests. The design of laser lines is complete and simulated by ZEMAX, aiming to minimize energy losses, optical distortions and providing a tunable experimental setup as well. The RF power network is close to be tested, it's based on a 55MW (2.5us pulse) S-band Klystron driven by a 500kV Pulse Forming Network based modulator and a Low Level RF system, running at 100 Hz. The Control System is been designed using EPICS and allows to manage easily and fastly each machine parameter. We expect to start commissioning the machine by the end of 2016 and obtain the first collisions within the first part of 2017.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW004  
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TUPOW041 Optimization Studies for the Beam Dynamic in the RF Linac of the ELI-NP Gamma Beam System 1850
 
  • C. Vaccarezza, D. Alesini, M. Bellaveglia, M.E. Biagini, G. Di Pirro, A. Gallo, A. Ghigo, S. Guiducci, A. Vannozzi, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Bacci, I. Drebot, D.T. Palmer, A.R. Rossi, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • G. Campogiani
    Rome University La Sapienza, Roma, Italy
  • A. Giribono, A. Mostacci, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
  • V. Petrillo
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • L. Sabbatini
    Consorzio Laboratorio Nicola Cabibbo, Frascati, Italy
 
  The ELI-NP GBS is an high spectral density and monochromatic gamma ray source based upon the inverse Compton scattering effect now under construction in Magurele.  Its relevant specifications are brilliance higher than 1021, 0.5% monochromaticity and a 0.2-19.5 MeV energy tunability. Strong requirements are set for the electron beam dynamic: the control of both the transverse normalized emittance and the energy spread to optimize the spectral density and guarantee the mono chromaticity of the emitted radiation. On this basis the RF Linac optimization has been performed for the designed energy range; a sensitivity analysis of the machine to possible jitters, errors and so on has been also performed, the simulations results hare here presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW041  
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