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MOPMB017 |
Design Issues for the Optical Transition Radiation Screens for theELI-NP Compton Gamma Source |
118 |
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- 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
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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.
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TUPMY041 |
Delivery Status of the ELI-NP Gamma Beam System |
1635 |
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- 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
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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.
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WEPMY007 |
Plasma Density Profile Characterization for Resonant Plasma Wakefield Acceleration Experiment at SPARC_LAB |
2554 |
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- 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
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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.
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TUPOW042 |
Expected Gamma Spectra at ELI-NP-GBS |
1854 |
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- I. Drebot, C. Curatolo
Universita' degli Studi di Milano e INFN, Milano, Italy
- A. Bacci, A.R. Rossi, L. Serafini
Istituto Nazionale di Fisica Nucleare, Milano, Italy
- A. Giribono
University of Rome "La Sapienza", Rome, Italy
- V. Petrillo
Universita' degli Studi di Milano & INFN, Milano, Italy
- C. Vaccarezza, A. Variola
INFN/LNF, Frascati (Roma), Italy
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The ELI-NP-GBS is an advanced source of up to 20 MeV Gamma Rays based on Compton back-scattering. We present the investigation of the production of the ELI-NP gamma photon beam generated by Compton back-scattering between the electron bunch accelerated in the linac and the laser pulse. At the interaction point (IP), the Compton backscattering properties, as spectral flux, brilliance and polarization are evaluated by the Klein-Nishina cross section. The gamma beam produced has energy ranging from 0.2 to 19.5 MeV and bandwidth of 0.5%. In order to define the optimal layout and evaluate the performances of the collimation and detection systems, a detailed Monte Carlo simulation activity has been carried out taking into account possible jitters and errors.
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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 |
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- 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
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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).
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MOPMB019 |
Quadrupole Scan Emittance Measurements for the ELI-NP Compton Gamma Source |
126 |
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- 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
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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.
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TUPOW041 |
Optimization Studies for the Beam Dynamic in the RF Linac of the ELI-NP Gamma Beam System |
1850 |
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- 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
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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.
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TUPOW043 |
Electron Beam Dynamics Studies for ELI-NP GBS Linac |
1857 |
SUPSS017 |
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- 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
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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.
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