Generation of high currents of carbon ions with the use of subnanosecond near-infrared laser pulses.
Emission of carbon currents reaching values up to 2 A/cm(2) at a distance of 1 m from the laser ion source driven by the subnanosecond Prague Asterix Laser System operated at a fundamental wavelength of 1315 nm is reported. Graphite targets were exposed to intensities up to 5x10(16) W/cm(2) varying both the laser energy and the position of the laser beam focus with respect to the target surface. The maximum energy gain of carbon ions was approximately = 1 MeV/u. At high laser intensities the shape of time-of-flight spectra is also formed by plasma outbursts, whose growth correlates with the oscillatory self-focusing of the laser beam.
Krása
J
J
Institute of Physics, AS CR, v.v.i., 182 21 Prague 8, Czech Republic. krasa@fzu.cz
Velyhan
A
A
Margarone
D
D
Krouský
E
E
Ullschmied
J
J
Skála
J
J
Láska
L
L
Jungwirth
K
K
Rohlena
K
K