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Laser accelerated protons can be a complimentary source for treatment ofoncological diseases to the existing hadron therapy facilities. We demonstratehow the protons, accelerated from near-critical density plasmas by laser pulseshaving relatively small power, reach energies which may be of interest formedical applications. When an intense laser pulse interacts with near-criticaldensity plasma it makes a channel both in the electron and then in the iondensity. The propagation of a laser pulse through such a self-generated channelis connected with the acceleration of electrons in the wake of a laser pulseand generation of strong moving electric and magnetic fields in the propagationchannel. Upon exiting the plasma the magnetic field generates a quasi-staticelectric field that accelerates and collimates ions from a thin filament formedin the propagation channel. Two-dimensional Particle-in-Cell simulations showthat a 100 TW laser pulse tightly focused on a near-critical density target isable to accelerate protons up to energy of 250 MeV. Scaling laws and optimalconditions for proton acceleration are established considering the energydepletion of the laser pulse.

Laser acceleration of protons from near critical density targets for application to radiation therapy