Author: Chiadroni, E.
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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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MOPMB019 Quadrupole Scan Emittance Measurements for the ELI-NP Compton Gamma Source 126
 
  • A.R. Rossi, A. Bacci, L. Serafini
    Istituto Nazionale di Fisica Nucleare, Milano, Italy
  • E. Chiadroni, C. Vaccarezza, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    Università di Roma II Tor Vergata, Roma, Italy
  • C. Curatolo, I. Drebot
    Universita' degli Studi di Milano e INFN, Milano, Italy
  • A. Giribono, A. Mostacci
    University of Rome La Sapienza, Rome, Italy
  • V. Petrillo, M. Rossetti Conti
    Universita' degli Studi di Milano & INFN, Milano, Italy
 
  The high brightness electron LINAC of the Compton Gamma Source at the ELI Nuclear Physics facility in Romania is accelerating a train of 32 bunches with a nominal charge of 250 pC and nominal spacing of 16 ns. To achieve the design gamma flux, all the bunches along the train must have the designed Twiss parameters. Beam sizes are measured with optical transition radiation monitors, allowing a quadrupole scan for Twiss parameters measurements. Since focusing the whole bunch train on the screen may lead to permanent screen damage, we investigated non-conventional scans such as scans around a maximum of the beam size or scans with a controlled minimum spot size. This paper discusses the implementation issues of such a technique in the actual machine layout.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMB019  
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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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