IBIC2017 - List of Authors (Cianchi, A.)

Paper	Title	Page
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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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
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Paper

Title

Page

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)

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)