FEL2013 - List of Authors (Sabia, E.)

Paper

Title

Page

Generation of a Train of Short Pulses by Means of FEL Emission of a Combed Electron Beam

2

V. Petrillo
Universita' degli Studi di Milano, Milano, Italy
M.P. Anania, M. Bellaveglia, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, G. Gatti, R. Pompili, C. Vaccarezza, F. Villa
INFN/LNF, Frascati (Roma), Italy
M. Artioli
ENEA-Bologna, Bologna, Italy
A. Bacci, A.R. Rossi
Istituto Nazionale di Fisica Nucleare, Milano, Italy
A. Cianchi
Università di Roma II Tor Vergata, Roma, Italy
F. Ciocci, G. Dattoli, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia
ENEA C.R. Frascati, Frascati (Roma), Italy
A. Mostacci
Rome University La Sapienza, Roma, Italy
P. Musumeci
UCLA, Los Angeles, California, USA
J.V. Rau
ISM-CNR, Rome, Italy

We present a direct and powerful method for generating train of radiation pulses based on the FEL radiation from a multi-peaked electron beam produced with a combed laser pulse accelerated and compressed in a linac by the velocity bunching technique. The electron beam, constituted by two bunches, can be extracted from the accelerating section when they are temporaly superimposed but separated in energy, so that each of them is characterized by a different value of the Lorentz factor. When driven in the FEL undulator, they emit two separate spectral lines, according to the FEL resonance condition, that interfere producing fringes in the time-domain. In this way a train of regular pulses can be obtained, without limitation in frequency, and with the perspective of reaching the attosecond domain in the X ray regime.

Slides MOICNO01 [8.836 MB]

WEOCNO02

Echo-enabled Devices and Coulombian Diffusion

G. Dattoli, E. Sabia
ENEA C.R. Frascati, Frascati (Roma), Italy

The mechanism of Echo-enabled FEL devices have been discussed by Stupakov and coworkers who have provided detailed analysis for an experimental implementation of their proposal. More recently the effect of the Coulombian diffusion as an element determining a dilution of the bunching coefficients has been studied by Stupakov, the problem has been treated using the diffusion equation coupled to a kind of ray tracing procedure. We propose a different approach based on the use of a Vlasov equation composed by two contributions accounting for the Liouville and diffusive part of the interaction. The equation is solved using simplectic integration procedures which provide an effective method of solution, easily implemented numerically, flexible and modular. The results which can be extended to different experimental conditions are confronted with those of earlier works.

Slides WEOCNO02 [1.474 MB]

Paper	Title	Page
MOICNO01	Generation of a Train of Short Pulses by Means of FEL Emission of a Combed Electron Beam	2
	V. Petrillo Universita' degli Studi di Milano, Milano, Italy M.P. Anania, M. Bellaveglia, E. Chiadroni, D. Di Giovenale, G. Di Pirro, M. Ferrario, G. Gatti, R. Pompili, C. Vaccarezza, F. Villa INFN/LNF, Frascati (Roma), Italy M. Artioli ENEA-Bologna, Bologna, Italy A. Bacci, A.R. Rossi Istituto Nazionale di Fisica Nucleare, Milano, Italy A. Cianchi Università di Roma II Tor Vergata, Roma, Italy F. Ciocci, G. Dattoli, L. Giannessi, A. Petralia, M. Quattromini, C. Ronsivalle, E. Sabia ENEA C.R. Frascati, Frascati (Roma), Italy A. Mostacci Rome University La Sapienza, Roma, Italy P. Musumeci UCLA, Los Angeles, California, USA J.V. Rau ISM-CNR, Rome, Italy
	We present a direct and powerful method for generating train of radiation pulses based on the FEL radiation from a multi-peaked electron beam produced with a combed laser pulse accelerated and compressed in a linac by the velocity bunching technique. The electron beam, constituted by two bunches, can be extracted from the accelerating section when they are temporaly superimposed but separated in energy, so that each of them is characterized by a different value of the Lorentz factor. When driven in the FEL undulator, they emit two separate spectral lines, according to the FEL resonance condition, that interfere producing fringes in the time-domain. In this way a train of regular pulses can be obtained, without limitation in frequency, and with the perspective of reaching the attosecond domain in the X ray regime.
	Slides MOICNO01 [8.836 MB]

WEOCNO02	Echo-enabled Devices and Coulombian Diffusion
	G. Dattoli, E. Sabia ENEA C.R. Frascati, Frascati (Roma), Italy
	The mechanism of Echo-enabled FEL devices have been discussed by Stupakov and coworkers who have provided detailed analysis for an experimental implementation of their proposal. More recently the effect of the Coulombian diffusion as an element determining a dilution of the bunching coefficients has been studied by Stupakov, the problem has been treated using the diffusion equation coupled to a kind of ray tracing procedure. We propose a different approach based on the use of a Vlasov equation composed by two contributions accounting for the Liouville and diffusive part of the interaction. The equation is solved using simplectic integration procedures which provide an effective method of solution, easily implemented numerically, flexible and modular. The results which can be extended to different experimental conditions are confronted with those of earlier works.
	Slides WEOCNO02 [1.474 MB]