Author: Palumbo, L.
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TUPOW043 Electron Beam Dynamics Studies for ELI-NP GBS Linac 1857
SUPSS017   use link to see paper's listing under its alternate paper code  
 
  • A. Giribono, F. Cardelli, L. Palumbo, L. Piersanti
    University of Rome La Sapienza, Rome, Italy
  • D. Alesini, A. Gallo, C. Vaccarezza, A. Vannozzi
    INFN/LNF, Frascati (Roma), Italy
  • A. Bacci, C. Curatolo, I. Drebot, V. Petrillo, A.R. Rossi, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • G. Campogiani
    Rome University La Sapienza, Roma, Italy
  • F. Cardelli, L. Piersanti
    INFN-Roma1, Rome, Italy
  • L. Palumbo
    INFN-Roma, Roma, Italy
 
  The ELI-NP Gamma Beam System is an advanced gamma ray source based on the Compton back-scattering effect with unprecedented specifications of brilliance ( >1021), monochromaticity (0.5%) and energy tunability (0.2 - 19.5 MeV), presently under construction in Magurele-Bucharest (RO). Here the head-on collision is foreseen between an intense high power laser beam and a high brightness high quality electron beam with a maximum kinetic energy of 740 MeV. The electron beam dynamics analysis and control for the ELI-NP GBS Linac in the single and multi bunch mode have been investigated and are here illustrated.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPOW043  
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WEPMY007 Plasma Density Profile Characterization for Resonant Plasma Wakefield Acceleration Experiment at SPARC_LAB 2554
 
  • F. Filippi
    INFN-Roma1, Rome, Italy
  • M.P. Anania, A. Biagioni, E. Chiadroni, M. Ferrario
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • F. Filippi, A. Giribono, A. Mostacci, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
  • F. Filippi, A. Giribono, A. Mostacci, L. Palumbo
    INFN-Roma, Roma, Italy
  • A. Giribono
    University of Rome "La Sapienza", Rome, Italy
  • A. Zigler
    The Hebrew University of Jerusalem, The Racah Institute of Physics, Jerusalem, Israel
 
  New generation of particle accelerators is based on the excitation of large amplitude plasma waves driven by either electron or laser beams, named as Plasma Wakefield Accelerator (PWFA) and Laser Wakefield Accelerator (LWFA), respectively. Future experiments scheduled at the SPARC_LAB test facility aim to demonstrate the acceleration of externally injected high brightness electron beams through both schemes. In particular, in the so-called resonant PWFA a train of more than two driver electron bunches generated with the laser comb technique resonantly excites wakefields into the plasma, the last bunch (witness) is injected at the proper accelerating phase gaining energy from the wake. The quality of the accelerated beam depends strongly on plasma density and its distribution along the acceleration length. The desired density can be achieved with a correct shaping of the capillary in which plasma is formed. The measurements of plasma density, as well as other plasma characteristics, can be performed with spectroscopic measurements of the plasma self emitted light. The measurement of density distribution for hydrogen filled capillaries is here reported.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY007  
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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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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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MOPMB018 Metrological Characterization of the Bunch Length Measurement by Means of a RF Deflector at the ELI-NP Compton Gamma source 122
 
  • L. Sabato
    U. Sannio, Benevento, Italy
  • D. Alesini, C. Vaccarezza, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • P. Arpaia
    CERN, Geneva, Switzerland
  • P. Arpaia, A. Liccardo
    Naples University Federico II, Science and Technology Pole, Napoli, Italy
  • A. Giribono
    University of Rome La Sapienza, Rome, Italy
  • A. Mostacci, L. Palumbo
    Rome University La Sapienza, Roma, Italy
  • L. Sabato
    INFN-Napoli, Napoli, Italy
 
  Bunch length measurement in linac can be carried out using a RF deflector, which provides a transverse kick to the beam. The transverse beam size on a screen, placed after the RF deflector, represents the bunch length. In this paper, the metrological characterization of the bunch length measurement technique is proposed. The uncertainty and the systematic errors are estimated by means of a sensitivity analysis to the measurement parameters. The proposed approach has been validated through simulation by means of ELEGANT code on the parameters interesting for the electron linac of the Compton source at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP).  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB018  
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TUPMY041 Delivery Status of the ELI-NP Gamma Beam System 1635
 
  • S. Tomassini, D. Alesini, A. Battisti, R. Boni, F. Cioeta, A. Delle Piane, E. Di Pasquale, G. Di Pirro, A. Falone, A. Gallo, S.I. Incremona, V.L. Lollo, A. Mostacci, S. Pioli, R. Ricci, U. Rotundo, A. Stella, C. Vaccarezza, A. Vannozzi, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Bacci, D.T. Palmer, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • N. Bliss
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • F. Cardelli
    INFN-Roma1, Rome, Italy
  • K. Cassou, Z.F. Zomer
    LAL, Orsay, France
  • G. D'Auria
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • A. Giribono, V. Pettinacci
    INFN-Roma, Roma, Italy
  • C. Hill
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • L. Palumbo
    Rome University La Sapienza, Roma, Italy
  • L. Piersanti
    University of Rome La Sapienza, Rome, Italy
 
  The ELI-NP GBS is a high intensity and monochromatic gamma source under construction in Magurele (Romania). The design and construction of the Gamma Beam System complex as well as the integration of the technical plants and the commissioning of the overall facility, was awarded to the Eurogammas Consortium in March 2014. The delivery of the facility has been planned in for 4 stages and the first one was fulfilled in October 31st 2015. The engineering aspects related to the delivery stage 1 are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY041  
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MOPMB017 Design Issues for the Optical Transition Radiation Screens for theELI-NP Compton Gamma Source 118
 
  • M. Marongiu, A. Giribono, A. Mostacci, V. Pettinacci
    INFN-Roma, Roma, Italy
  • D. Alesini, E. Chiadroni, F. Cioeta, G. Di Pirro, V.L. Lollo, L. Pellegrino, V. Shpakov, A. Stella, C. Vaccarezza, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • L. Palumbo
    University of Rome La Sapienza, Rome, Italy
 
  A high brightness electron LINAC is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32, 16 ns spaced, bunches with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with optical transition radiation profile monitors. In order to measure the beam properties along the train, the screens must sustain the thermal stress due to the energy deposited by the bunches; moreover the optical radiation detecting system must have the necessary accuracy and resolution. This paper deals with the analytical studies as well as numerical simulations to investigate the thermal behaviour of the screens impinged by the nominal bunch; the design and the performance of the optical detection line is discussed as well.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB017  
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MOPMW005 Design of Linac with the New Gaskets Clamping Fabrication Technique 403
SUPSS086   use link to see paper's listing under its alternate paper code  
 
  • F. Cardelli
    INFN-Roma1, Rome, Italy
  • D. Alesini
    INFN/LNF, Frascati (Roma), Italy
  • M. Magi, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
  • F. Pellegrino, V. Pettinacci
    INFN-Roma, Roma, Italy
 
  Recently, a new technique for the realization of high gradient accelerating structures based on the use of gaskets without brazing processes, has been successfully tested at high power on a 1.6 cells RF gun (D. Alesini, et al, PRST 18, 02001, 2015). The new technique developed at the Laboratories of Frascati of the INFN (Italy) in the framework of the SPARC_LAB project has been also adopted for the ELI-NP RF gun. The use of the special gaskets that simultaneously guarantee the vacuum seal and a perfect RF contact allow to avoid the brazing process, strongly reducing the cost, the realization time and the risk of failure. Moreover, without copper annealing due to the brazing process, it is possible, in principle, to decrease the breakdown rate increasing, at the same time, the maximum achievable gradient. The extension of this new fabrication process to complex LINAC structures is the next step on the application of this new technique on particle accelerator. In the paper, we discuss how to extend this process to S-band and C-band Travelling Wave accelerating structures illustrating their electromagnetic design and their mechanical realization.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW005  
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MOPMW007 On the Calibration Measurement of Stripline Beam Position Monitor for the ELI-NP Facility 411
 
  • D. De Arcangelis, F. Cardelli, A. Mostacci, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
 
  Stripline Beam Position Monitor (BPM) will be installed in the Compton Gamma Source in construction at the ELI Nuclear Physics facility in Romania. A test bench for the calibration of BPM has been built to characterize the device with stretched wire measurement in order to get the BPM response map. A full S-parameters characterisation is performed as well to measure the electrical offset with the "Lambertson method". This paper discusses the extensive simulations performed with full 3D electromagnetic CAD codes of the above measurements to investigate measurement accuracy, possible measurement artefacts and the beam position reconstruction.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMW007  
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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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