摘要
A new scheme of radiation pressure acceleration for generating high-quality protons by using two overlappingparallel laser pulses is proposed. Particle-in-cell simulation shows that the overlapping of two pulses with identical Caussian profiles in space and trapezoidal profiles in the time domain can result in a composite light pulse with a spatial profile suitable for stable acceleration of protons to high energies. At～2.46 × 10^21 W/cm^2 intensity of the combination light pulse, a quasi-monoenergetic proton beam with peak energy ,～200 MeV/nucleon, energy spread 〈15%, and divergency angle 〈4° is obtained, which is appropriate for tumor therapy. The proton beam quality can be controlled by adjusting the incidence points of two laser pulses.
A new scheme of radiation pressure acceleration for generating high-quality protons by using two overlappingparallel laser pulses is proposed. Particle-in-cell simulation shows that the overlapping of two pulses with identical Caussian profiles in space and trapezoidal profiles in the time domain can result in a composite light pulse with a spatial profile suitable for stable acceleration of protons to high energies. At～2.46 × 10^21 W/cm^2 intensity of the combination light pulse, a quasi-monoenergetic proton beam with peak energy ,～200 MeV/nucleon, energy spread 〈15%, and divergency angle 〈4° is obtained, which is appropriate for tumor therapy. The proton beam quality can be controlled by adjusting the incidence points of two laser pulses.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11175255, 11175253, 11205243, 11375265 and 11305264, and the Research Fund of the Doctoral Program of Higher Education of China under Grant No 20114307110020.
