Lasers As Particle Accelerators In Medicine: From Laser-Driven Protons To Imaging With Thomson Sources

摘要

We report our recent progress using a high-power, picosecond CO_(2) laser for Thomson scattering and ion acceleration experiments. These experiments capitalize on certain advantages of long-wavelength CO_(2) lasers, such as their high number of photons per energy unit and beneficial wavelength- scaling of the electrons' ponderomotive energy and critical plasma frequency. High X-ray fluxes produced in the interactions of the counter-propagating laser- and electron-beams for obtaining single-shot, high-contrast images of biological objects. The laser, focused on a hydrogen jet, generated a monoenergetic proton beam via the radiation-pressure mechanism. The energy of protons produced by this method scales linearly with the laser's intensity. We present a plan for scaling the process into the range of 100-MeV proton energy via upgrading the CO_(2) laser. This development will enable an advance to the laser-driven proton cancer therapy.