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キーワード:
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要旨:
The advent of high-power laser systems paved the way for laser acceleration
of ion beams. Based on theoretical simulations, we demonstrate the
feasibility of laser-generated ion beams matching the strict requirements for
radio-oncological applications. Particle energies of several hundred MeV
and low energy spreads of 1% are feasible within the framework of direct
laser acceleration. A mechanism is suggested to efficiently post-accelerate
particle beams originating from laser-plasma interaction processes, where
the injection of ions into the focus is modeled in a realistic way. Introducing
a long-wavelength CO2 laser leads to an increase in the total number
of particles accelerated as one bunch by three orders of magnitude as compared
to lasers with a wavelength around 1 μm. By employing pulsed laser
systems in a single- and a crossed-beams configuration, we show that ion
beams of high particle numbers can be produced. In a different setting we
put forward the interaction of a chirped laser pulse with a hydrogen gas
target of spatial extension of the order of the laser wavelength studied by
means of particle-in-cell simulations. The low frequency components of the
laser pulse allow for generating clinically applicable beams already while
interacting with state-of-the-art laser systems of intensities of 1021 W/cm2.
