IBIC2017 - List of Authors (Mostacci, A.)

Paper	Title	Page
TUPCF16	Stripline Beam Position Monitor Modelling and Simulations for Charge Measurements	247
	G. Castorina INFN-Roma1, Rome, Italy G. Franzini, B. Spataro INFN/LNF, Frascati (Roma), Italy M. Marongiu, A. Mostacci INFN-Roma, Roma, Italy A.A. Nosych ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
	Strip line Beam Positions Monitors (BPMs) are the main devices used for non-intercepting position measurement for the electron LINAC of ELI-NP (Extreme Light Infrastructure - Nuclear Physics). All the 29 BPMs have the same design, with the exception of the one installed in one of the dump line, which has a much larger acceptance than the others. BPMs will also be used to measure the charge of the beam, by measuring the sum of the pickups signals and calibrating it with beam charge monitors installed along the LINAC. An analytical model has been developed for the proposed BPMs. This model has been checked by means of PIC/wakefield simulations, in order to obtain the pickups signals at the passage of the beam and to study the effects of BPMs non-linearities, particularly on charge measurements. Details of the analytical model, results of the numerical simulations and the correction algorithm proposed for charge measurements are described in this paper.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF16
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MOPCC13	Beam Energy Measurements With a Optical Transition Radiation for the ELI-NP Compton Gamma Source	68
	M. Marongiu, D. Cortis INFN-Roma, Roma, Italy E. Chiadroni, F. Cioeta, G. Di Pirro, G. Franzini, V. Shpakov, A. Stella, C. Vaccarezza, A. Variola INFN/LNF, Frascati (Roma), Italy A. Cianchi Università di Roma II Tor Vergata, Roma, Italy A. Giribono, M. Pompili Sapienza University of Rome, Rome, Italy A. Mostacci, L. Palumbo Rome University La Sapienza, Roma, 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 bunches, 16 ns spaced, with a nominal charge of 250 pC will collide with the laser beam in the interaction point at two electron beam energies, namely 280 MeV and 720 MeV. Electron beam spot size is measured with optical transition radiation (OTR) profile monitors. The paper deals with the possibility of using the OTR monitors to measure also beam energy along the machine; such measurements may help monitoring the accelerating sections performances, especially when the whole bunch train is being accelerated. We discuss the measurement principle, the expected accuracy and the main characteristic of the optical line to retrieve the angular distribution of the emitted radiation.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC13
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TUPCF15	S-Band Cavity BPM Readout Electronics for the ELI-NP Gamma Beam Source	243
	M. Cargnelutti, B.B. Baricevic I-Tech, Solkan, Slovenia G. Franzini, D. Pellegrini, A. Stella, A. Variola INFN/LNF, Frascati (Roma), Italy A. Mostacci Rome University La Sapienza, Roma, Italy
	The Extreme Light Infrastructure ' Nuclear Physics Gamma Beam Source (ELI-NP GBS) facility will provide an high intensity laser and a very intense gamma beam for verious experiments. The gamma beam is generated through incoherent Compton back-scattering of a laser light off a high brightness electron beam provided by a 720MeV warm LINAC. The electrons are organized in compact trains with up to 32 bunches, each separated by 16ns. To optimize the laser-electron interaction and therefore the generation of the gamma rays, one big challenge is to precisely monitor the trajectory of each electron bunch. To match this requirement, at the interaction point two S-band cavity beam position monitors will be used, and the related readout system should perform bunch-by-bunch position measurements with sub-μm resolution. Using 500MS/s ADC converters and dedicated data processing, the readout system proposes an alternative measurement concept. In this paper the architecture of the system, the implemented signal processing and the results of the first laboratory tests will be presented.
	Poster TUPCF15 [4.303 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF15
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WE1AB3	Overview of the Diagnostics of the ELI-NP Gamma Beam System: Challenges for the Electron-Photon Interaction Point Diagnostics
	A. Mostacci Rome University La Sapienza, Roma, Italy A. Variola INFN/LNF, Frascati (Roma), Italy
	The Extreme Light Infrastructure-Nuclear Physics (ELI-NP) facility is currently under construction near Bucharest (Romania); it will focus on laser-based fundamental research on nuclear physics. The facility will host two 10 PW laser systems and an advanced gamma beam source, called Gamma Beam System (GBS). GBS is a photon electron collider producing gamma rays from Compton back scattering of a laser light off a high charge, low emittance electron beam from a 720 MeV warm linac. The gamma rays will have tunable energy (1-20MeV) with worldwide outstanding performances, such as narrow bandwidth (0.3%) and high spectral density (10⁴ photons/s/eV). To achieve such challenging performances, the luminosity will be raised by colliding up to 32 electron bunches with a properly recirculated laser beam. New class diagnostics need to be developed at the interaction point to allow efficient photon electron collisions. This infrastructure will create a new European laboratory with a broad range of science covering frontier fundamental physics, new nuclear physics and astrophysics as well as applications in nuclear materials, radioactive waste management, material science and life sciences.
	Slides WE1AB3 [5.769 MB]
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WEPCC20	RF Deflector Based Measurements of the Correlations Between Vertical and Longitudinal Planes at ELI-NP-GBS Electron LINAC	404
	L. Sabato U. Sannio, Benevento, Italy P. Arpaia, A. Liccardo Naples University Federico II, Science and Technology Pole, Napoli, Italy A. Cianchi Università di Roma II Tor Vergata, Roma, Italy A. Giribono, A. Mostacci, L. Palumbo Sapienza University of Rome, Rome, Italy C. Vaccarezza, A. Variola INFN/LNF, Frascati (Roma), Italy
	The correlations between vertical and longitudinal planes at the Radio Frequency Deflector (RFD) entrance can be introduced by misalignments of accelerating sections or quadrupoles upstream of the RFD. These correlations are undesired effects and they can affect the RFD based bunch length measurements in high-brightness electron LINAC. In this paper, an RFD based measurement technique for vertical and longitudinal planes is proposed. The basic idea is to obtain information about the correlations between vertical and longitudinal planes from vertical spot size measurements varying the RFD phase, because they add contributions on this quantity. In particular, considering a small RFD phase range centred in 0 or π rad, the correlations between the particle longitudinal positions and the vertical plane are constant with the deflecting voltage phase, on the contrary, the correlations between the particle energies and the vertical plane vary linearly with the deflecting voltage phase. The simulations are carried out by means of ELEctron Generation ANd Tracking (ELEGANT) code in the case of the Gamma Beam System (GBS) at the Extreme Light Infrastructure-Nuclear Physics (ELI-NP).
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCC20
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Stripline Beam Position Monitor Modelling and Simulations for Charge Measurements

247

G. Castorina
INFN-Roma1, Rome, Italy
G. Franzini, B. Spataro
INFN/LNF, Frascati (Roma), Italy
M. Marongiu, A. Mostacci
INFN-Roma, Roma, Italy
A.A. Nosych
ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain

Strip line Beam Positions Monitors (BPMs) are the main devices used for non-intercepting position measurement for the electron LINAC of ELI-NP (Extreme Light Infrastructure - Nuclear Physics). All the 29 BPMs have the same design, with the exception of the one installed in one of the dump line, which has a much larger acceptance than the others. BPMs will also be used to measure the charge of the beam, by measuring the sum of the pickups signals and calibrating it with beam charge monitors installed along the LINAC. An analytical model has been developed for the proposed BPMs. This model has been checked by means of PIC/wakefield simulations, in order to obtain the pickups signals at the passage of the beam and to study the effects of BPMs non-linearities, particularly on charge measurements. Details of the analytical model, results of the numerical simulations and the correction algorithm proposed for charge measurements are described in this paper.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF16

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

MOPCC13

Beam Energy Measurements With a Optical Transition Radiation for the ELI-NP Compton Gamma Source

68

M. Marongiu, D. Cortis
INFN-Roma, Roma, Italy
E. Chiadroni, F. Cioeta, G. Di Pirro, G. Franzini, V. Shpakov, A. Stella, C. Vaccarezza, A. Variola
INFN/LNF, Frascati (Roma), Italy
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
A. Giribono, M. Pompili
Sapienza University of Rome, Rome, Italy
A. Mostacci, L. Palumbo
Rome University La Sapienza, Roma, 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 bunches, 16 ns spaced, with a nominal charge of 250 pC will collide with the laser beam in the interaction point at two electron beam energies, namely 280 MeV and 720 MeV. Electron beam spot size is measured with optical transition radiation (OTR) profile monitors. The paper deals with the possibility of using the OTR monitors to measure also beam energy along the machine; such measurements may help monitoring the accelerating sections performances, especially when the whole bunch train is being accelerated. We discuss the measurement principle, the expected accuracy and the main characteristic of the optical line to retrieve the angular distribution of the emitted radiation.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-MOPCC13

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPCF15

S-Band Cavity BPM Readout Electronics for the ELI-NP Gamma Beam Source

243

M. Cargnelutti, B.B. Baricevic
I-Tech, Solkan, Slovenia
G. Franzini, D. Pellegrini, A. Stella, A. Variola
INFN/LNF, Frascati (Roma), Italy
A. Mostacci
Rome University La Sapienza, Roma, Italy

The Extreme Light Infrastructure ' Nuclear Physics Gamma Beam Source (ELI-NP GBS) facility will provide an high intensity laser and a very intense gamma beam for verious experiments. The gamma beam is generated through incoherent Compton back-scattering of a laser light off a high brightness electron beam provided by a 720MeV warm LINAC. The electrons are organized in compact trains with up to 32 bunches, each separated by 16ns. To optimize the laser-electron interaction and therefore the generation of the gamma rays, one big challenge is to precisely monitor the trajectory of each electron bunch. To match this requirement, at the interaction point two S-band cavity beam position monitors will be used, and the related readout system should perform bunch-by-bunch position measurements with sub-μm resolution. Using 500MS/s ADC converters and dedicated data processing, the readout system proposes an alternative measurement concept. In this paper the architecture of the system, the implemented signal processing and the results of the first laboratory tests will be presented.

Poster TUPCF15 [4.303 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-TUPCF15

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WE1AB3

Overview of the Diagnostics of the ELI-NP Gamma Beam System: Challenges for the Electron-Photon Interaction Point Diagnostics

A. Mostacci
Rome University La Sapienza, Roma, Italy
A. Variola
INFN/LNF, Frascati (Roma), Italy

The Extreme Light Infrastructure-Nuclear Physics (ELI-NP) facility is currently under construction near Bucharest (Romania); it will focus on laser-based fundamental research on nuclear physics. The facility will host two 10 PW laser systems and an advanced gamma beam source, called Gamma Beam System (GBS). GBS is a photon electron collider producing gamma rays from Compton back scattering of a laser light off a high charge, low emittance electron beam from a 720 MeV warm linac. The gamma rays will have tunable energy (1-20MeV) with worldwide outstanding performances, such as narrow bandwidth (0.3%) and high spectral density (10⁴ photons/s/eV). To achieve such challenging performances, the luminosity will be raised by colliding up to 32 electron bunches with a properly recirculated laser beam. New class diagnostics need to be developed at the interaction point to allow efficient photon electron collisions. This infrastructure will create a new European laboratory with a broad range of science covering frontier fundamental physics, new nuclear physics and astrophysics as well as applications in nuclear materials, radioactive waste management, material science and life sciences.

Slides WE1AB3 [5.769 MB]

Export •

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WEPCC20

RF Deflector Based Measurements of the Correlations Between Vertical and Longitudinal Planes at ELI-NP-GBS Electron LINAC

404

L. Sabato
U. Sannio, Benevento, Italy
P. Arpaia, A. Liccardo
Naples University Federico II, Science and Technology Pole, Napoli, Italy
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
A. Giribono, A. Mostacci, L. Palumbo
Sapienza University of Rome, Rome, Italy
C. Vaccarezza, A. Variola
INFN/LNF, Frascati (Roma), Italy

The correlations between vertical and longitudinal planes at the Radio Frequency Deflector (RFD) entrance can be introduced by misalignments of accelerating sections or quadrupoles upstream of the RFD. These correlations are undesired effects and they can affect the RFD based bunch length measurements in high-brightness electron LINAC. In this paper, an RFD based measurement technique for vertical and longitudinal planes is proposed. The basic idea is to obtain information about the correlations between vertical and longitudinal planes from vertical spot size measurements varying the RFD phase, because they add contributions on this quantity. In particular, considering a small RFD phase range centred in 0 or π rad, the correlations between the particle longitudinal positions and the vertical plane are constant with the deflecting voltage phase, on the contrary, the correlations between the particle energies and the vertical plane vary linearly with the deflecting voltage phase. The simulations are carried out by means of ELEctron Generation ANd Tracking (ELEGANT) code in the case of the Gamma Beam System (GBS) at the Extreme Light Infrastructure-Nuclear Physics (ELI-NP).

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IBIC2017-WEPCC20

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)