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内容記述 |
Numerical investigations of the ionization mechanisms in the high-temperature high-density gold plasma formed by a high contrast high-intensity laser pulse interacting with gold foil are performed to investigate high-efficiency gold ion acceleration with few PW-level laser systems, aiming at producing ≳ 10 MeV/u gold beams required to serve as an alternative to the front end of a conventional heavy ion accelerator complex such as an ion source, linac, and drift tube linac (DTL). Short pulse high-intensity laser pulses with a peak intensity of a few times 1022 Wcm−2, which is not strong enough to expel Au L-shell electrons by laser field ionization, are shown to sufficiently resistively heat up the target bulk temperature so that collisional ionization by electrons in the plasma can expel L-shell electrons. The resultant highly charged Au ions (∼+72±4) are exposed to the sheath field and accelerated to higher energies of ∼20 MeV/u. |
