Generation of high currents of carbon ions with the use of subnanosecond near-infrared laser pulses

Krása, J.; Velyhan, A.; Margarone, D.; Krouský, E.; Ullschmied, J.; Skála, J.; Láska, L.; Jungwirth, K.; Rohlena, K.
February 2010
Review of Scientific Instruments;Feb2010, Vol. 81 Issue 2, p02A504
Academic Journal
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 5×1016 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.


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