研究目的
To improve the quality of proton beams via ultra-intense laser pulse interacting with double plasma targets.
研究成果
By using a pre-target with optimized parameters, one can obtain an energetic proton beam from the main target with much improved beam qualities, such as better collimation and monochromaticity, lower momentum divergence, and higher current density. The energy conversion efficiency from laser to main target is increased.
研究不足
The focused peak intensity of laser is limited by the material breakdown threshold in practice, and many other undesirable effects such as instabilities come to appear over long interaction time.
1：Experimental Design and Method Selection:
A new scheme with double plasma targets is proposed. Both one- and two-dimensional Particle-in-Cell simulations are conducted.
2：Sample Selection and Data Sources:
The pre- and main targets are plasmas with densities being 20nc and 150nc, respectively.
3：List of Experimental Equipment and Materials:
A circularly polarized laser pulse with intensity of I =
4：5 × 10^22W·cm^-2 and wavelength of λ = 1μm is employed. Experimental Procedures and Operational Workflow:
The laser pulse propagates along x-axis and incidents normally on the targets.
5：Data Analysis Methods:
The energy conversion efficiency from the laser pulse to the main target is analyzed.
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