研究目的
Investigating the proton acceleration processes involved in the interaction of an ultrashort circularly polarized laser with a near-critical density spherical target.
研究成果
The study reveals that protons get accelerated more effectively using a circularly polarized laser from a spherical target as compared to a rectangularly shaped target having the same thickness. The beam collimation is also better in the spherical case. The curved front surface enhances the generation of quasimonoenergetic proton beams. The target geometry is found to play a major role in the maximum energy attained by the protons. This energy further depends on the target size and density.
研究不足
The study is limited to the interaction of a circularly polarized laser with spherical plasma targets in the near-critical density regime. The effects of other laser polarizations and target geometries are not explored in depth.
1：Experimental Design and Method Selection:
Three dimensional particle in cell (PIC) simulations are used to study the interaction of a high-intensity laser with spherical plasma targets in the near-critical density regime.
2：Sample Selection and Data Sources:
A simulation box of dimensions 20 x 20 x 20 μm3 consisting of 200 x 200 x 200 cells is used. A spherically shaped hydrogen plasma is introduced inside the simulation box.
3：List of Experimental Equipment and Materials:
The simulations are performed with 50 macroparticles per cell, and one time step is equal to
4：2ωp^-The target is initially cold and uniform. Experimental Procedures and Operational Workflow:
The simulations are performed for plasma with diameters of 5 μm and 10 μm, respectively, for different target densities. The target densities are kept around the threshold density for relativistic transparency.
5：Data Analysis Methods:
The longitudinal electric field Ez is normalized by the laser electric field E0, and the longitudinal momentum pz is normalized by mpc, where mp is the mass of the hydrogen ion (proton) and c is the velocity of laser in vacuum.
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