Quattromini, M.

Paper	Title	Page
WEAAU02	Direct Measurement of Phase Space Evolution in the SPARC High Brightness Photoinjector	284
	D. Alesini, M. Bellaveglia, M. Boscolo, M. Castellano, A. Clozza, L. Cultrera, G. Di Pirro, A. Drago, A. Esposito, M. Ferrario, D. Filippetto, V. Fusco, A. Gallo, G. Gatti, A. Ghigo, M. Incurvati, C. Ligi, L. Pellegrino, R. Ricci, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, F. Tazzioli, S. Tomassini, C. Vaccarezza, M. Vescovi, C. Vicario, E. Chiadroni INFN/LNF, Frascati (Roma) A. Bacci INFN/LASA, Segrate (MI) L. Catani, A. Cianchi INFN-Roma II, Roma S. Cialdi, A. R. Rossi, L. Serafini INFN-Milano, Milano L. Giannessi, M. Quattromini, C. Ronsivalle ENEA C. R. Frascati, Frascati (Roma) M. Migliorati, A. Mostacci, L. Palumbo Rome University La Sapienza, Roma P. Musumeci, J. B. Rosenzweig UCLA, Los Angeles, California M. Petrarca INFN-Roma, Roma
	The characterization of the transverse phase space for high charge density relativistic electron beams is a fundamental requirement in many particle accelerator facilities, in particular those devoted to fourth-generation synchrotron radiation sources, such as SASE FEL. The main purpose of the SPARC initial phase was the commissioning of the RF photoinjector. At this regard, the evolution of the phase space has been fully characterized by means of the emittance meter diagnostics tool, placed in the drift after the gun exit. The large amount of collected data has shown not only that we can achieve the SPARC nominal parameters, but has also allowed for the first time a detailed reconstruction of the transverse phase space evolution along the drift, giving evidences of the emittance compensation process to occur as predicted by theory and simulations. In particular the peculiar behavior of a flat top longitudinal electron distribution compared to a gaussian distribution has been studied giving important insights for the correct matching with the following linac based on the double emittance minimum effect.
	Slides
WEPPH016	The SPARC FEL Undulator System: Magnetic and Mechanical Characterizations
	F. Ciocci, G. Dattoli, A. Doria, E. Giovenale, A. Lo Bue, M. Quattromini, G. Ronci, M. Sassi, L. Semeraro, E. Sabia ENEA C. R. Frascati, Frascati (Roma) D. Doelling, H.-U. Klein, P. A. Komorowski, D. Krischel, M. Meyer-Reumers ACCEL, Bergisch Gladbach
	Strict tolerances are required on the magnetic field quality of the SPARC undulators in order to met the condition of saturation in about 12 meters of magnetic length and to ensure the design performances, which foresee the simultaneous operation at the fundamental and at higher harmonics. The undulator sections have been realised at ACCEL instruments and have been passed different tests aimed at characterizing the requirements of magnetic field and mechanical precision. We describe the various magnetic and mechanical test performed either at ACCEL and at the ENEA Frascati Labs. In particular we will report on a) Quality of the magnetic field, namely phase error, roll-off of the transverse magnetic field components along the beam axis and minimization of the errors of the field integrals and integrated multipoles calculated along the transversal beam axis, and their dependence on the gap b) Mechanical issues connected with the proper identification of the geometrical and magnetic axes and with the control of the gap tuning We will in particular comment on the issues associated with he proper understanding of the phase advance and how this parameter is related to other quantities of paramount importance as ΔK/K . Furthermore we will also discuss the observed undulator harmonic content using an appropriate Fourier analysis of the experimental data.