Controlled transport and focusing of laser-accelerated protons with miniature magnetic devices.
This Letter demonstrates the transporting and focusing of laser-accelerated 14 MeV protons by permanent magnet miniature quadrupole lenses providing field gradients of up to 500 T/m. The approach is highly reproducible and predictable, leading to a focal spot of (286 x 173) microm full width at half maximum 50 cm behind the source. It decouples the relativistic laser-proton acceleration from the beam transport, paving the way to optimize both separately. The collimation and the subsequent energy selection obtained are perfectly applicable for upcoming high-energy, high-repetition rate laser systems.
Schollmeier
M
M
Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, Darmstadt, Germany.
Becker
S
S
Geissel
M
M
Flippo
K A
KA
Blazević
A
A
Gaillard
S A
SA
Gautier
D C
DC
Grüner
F
F
Harres
K
K
Kimmel
M
M
Nürnberg
F
F
Rambo
P
P
Schramm
U
U
Schreiber
J
J
Schütrumpf
J
J
Schwarz
J
J
Tahir
N A
NA
Atherton
B
B
Habs
D
D
Hegelich
B M
BM
Roth
M
M