title: Experimental demonstration of emittance compensation with velocity bunching.
abstract: In this Letter we report the first experiments aimed at the simultaneous demonstration of the emittance compensation process and velocity bunching in a high brightness electron source, the SPARC photoinjector in INFN-LNF. While a maximum compression ratio up to a factor 14 has been observed, in a particular case of interest a compression factor of 3, yielding a slice current of 120 A with less than 2 microm slice emittance, has been measured. This technique may be crucial in achieving high brightness beams in photoinjectors aiming at optimized performance of short wavelength single-pass free electron lasers or other advanced applications in laser-plasma accelerators.
authors.affiliation: INFN-LNF, Via Enrico Fermi, 40-00044 Frascati, Rome, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Ferrario
authors.forename: D
authors.initials: D
authors.lastname: Alesini
authors.forename: A
authors.initials: A
authors.lastname: Bacci
authors.forename: M
authors.initials: M
authors.lastname: Bellaveglia
authors.forename: R
authors.initials: R
authors.lastname: Boni
authors.forename: M
authors.initials: M
authors.lastname: Boscolo
authors.forename: M
authors.initials: M
authors.lastname: Castellano
authors.forename: E
authors.initials: E
authors.lastname: Chiadroni
authors.forename: A
authors.initials: A
authors.lastname: Cianchi
authors.forename: L
authors.initials: L
authors.lastname: Cultrera
authors.forename: G
authors.initials: G
authors.lastname: Di Pirro
authors.forename: L
authors.initials: L
authors.lastname: Ficcadenti
authors.forename: D
authors.initials: D
authors.lastname: Filippetto
authors.forename: V
authors.initials: V
authors.lastname: Fusco
authors.forename: A
authors.initials: A
authors.lastname: Gallo
authors.forename: G
authors.initials: G
authors.lastname: Gatti
authors.forename: L
authors.initials: L
authors.lastname: Giannessi
authors.forename: M
authors.initials: M
authors.lastname: Labat
authors.forename: B
authors.initials: B
authors.lastname: Marchetti
authors.forename: C
authors.initials: C
authors.lastname: Marrelli
authors.forename: M
authors.initials: M
authors.lastname: Migliorati
authors.forename: A
authors.initials: A
authors.lastname: Mostacci
authors.forename: E
authors.initials: E
authors.lastname: Pace
authors.forename: L
authors.initials: L
authors.lastname: Palumbo
authors.forename: M
authors.initials: M
authors.lastname: Quattromini
authors.forename: C
authors.initials: C
authors.lastname: Ronsivalle
authors.forename: A R
authors.initials: AR
authors.lastname: Rossi
authors.forename: J
authors.initials: J
authors.lastname: Rosenzweig
authors.forename: L
authors.initials: L
authors.lastname: Serafini
authors.forename: M
authors.initials: M
authors.lastname: Serluca
authors.forename: B
authors.initials: B
authors.lastname: Spataro
authors.forename: C
authors.initials: C
authors.lastname: Vaccarezza
authors.forename: C
authors.initials: C
authors.lastname: Vicario