Experimental demonstration of emittance compensation with velocity bunching.
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.
Ferrario
M
M
INFN-LNF, Via Enrico Fermi, 40-00044 Frascati, Rome, Italy.
Alesini
D
D
Bacci
A
A
Bellaveglia
M
M
Boni
R
R
Boscolo
M
M
Castellano
M
M
Chiadroni
E
E
Cianchi
A
A
Cultrera
L
L
Di Pirro
G
G
Ficcadenti
L
L
Filippetto
D
D
Fusco
V
V
Gallo
A
A
Gatti
G
G
Giannessi
L
L
Labat
M
M
Marchetti
B
B
Marrelli
C
C
Migliorati
M
M
Mostacci
A
A
Pace
E
E
Palumbo
L
L
Quattromini
M
M
Ronsivalle
C
C
Rossi
A R
AR
Rosenzweig
J
J
Serafini
L
L
Serluca
M
M
Spataro
B
B
Vaccarezza
C
C
Vicario
C
C