The optimization of the beam brightness is one of the main goals of the research and development efforts in rf photo-injectors devoted to short wavelength FELs. The ve- locity bunching experiment at SPARC has recently demon- strated the possibility of increasing the beam current via rf compression at low energies, while compensating the space charge induced emittance degradation by means of contin- uous magnetic focusing, increasing the final beam bright- ness. Stable compression ratios up to a factor 12 and 17 have been observed respectively for the high charge and low charge cases. In this paper measurements of longitu- dinal beam characteristics, projected and slice transverse emittances in the velocity bunching regime are presented, for different Gun-solenoid field values. Comparisons with simulations are also reported.
VELOCITY BUNCHING EXPERIMENT AT SPARC / Filippetto, D., Alesini, D., Bellaveglia, M., Boni, R., Boscolo, M., Castellano, M., Chiadroni, E., Cultrera, L., Di Pirro, G., Ferrario, M., Ficcadenti, L., Fusco, V., Gallo, A., Gatti, G., Marrelli, C., Migliorati, M., Mostacci, A., Pace, E., Palumbo, L., Spataro, B., et al.. - STAMPA. - (2009). (Free electron laser Conference FEL09 Liverpool, UK August 2009).
VELOCITY BUNCHING EXPERIMENT AT SPARC
E. Chiadroni;L. Ficcadenti;MIGLIORATI, Mauro;MOSTACCI, Andrea;PALUMBO, Luigi;
2009
Abstract
The optimization of the beam brightness is one of the main goals of the research and development efforts in rf photo-injectors devoted to short wavelength FELs. The ve- locity bunching experiment at SPARC has recently demon- strated the possibility of increasing the beam current via rf compression at low energies, while compensating the space charge induced emittance degradation by means of contin- uous magnetic focusing, increasing the final beam bright- ness. Stable compression ratios up to a factor 12 and 17 have been observed respectively for the high charge and low charge cases. In this paper measurements of longitu- dinal beam characteristics, projected and slice transverse emittances in the velocity bunching regime are presented, for different Gun-solenoid field values. Comparisons with simulations are also reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
