Emission of carbon currents reaching values up to 2 A/ cm2 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 5× 10 16 W/ cm2 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 ≈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.
Bibliographical noteFunding Information:
This work was partly supported by the Academy of Sciences of the Czech Republic (Project No. AV0Z10100523) and by the Grant Agency of the ASCR (Grant No. IAA100100715).
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