研究目的
Investigating the production of super-ponderomotive relativistic electrons during multi-picosecond laser-plasma interaction and understanding the underlying mechanisms of electromagnetic field growth triggering this acceleration.
研究成果
The study concludes that the production of super-ponderomotive relativistic electrons during multi-picosecond laser-plasma interaction is significantly influenced by the pulse duration, with the higher slope temperature far exceeding the ponderomotive scaling value. The rapid growth of quasi-static electromagnetic fields in an under-critical plasma plays a crucial role in triggering this acceleration. The findings open new avenues for understanding and optimizing laser-plasma interactions for applications requiring high-energy electrons.
研究不足
The study is limited by the computational constraints in simulating the ionization degree and the artificial boundary conditions applied to prevent electron recirculation in the simulation, which may underestimate the maximum energy of the SP-REs. Additionally, the experimental setup's reliance on specific laser systems and targets may limit the generalizability of the findings.
1：Experimental Design and Method Selection:
The experiment was conducted using the LFEX laser system at the Institute of Laser Engineering, Osaka University. The LFEX laser consists of four beams, delivering 300 J of
2：053 μm wavelength laser light with a 2 ps duration (FWHM), and the peak intensity of one beam was 5 × 10^18 W cm^?A plasma mirror (PM) was implemented to realize the pre-plasma-free condition. Sample Selection and Data Sources:
The clean pulses were focused on a 1 mm^3 gold cube.
3：List of Experimental Equipment and Materials:
The LFEX laser system, plasma mirror, gold cube target, vacuum electron spectrometer (ESM), and high-energy X-ray spectrometer (HEXS).
4：Experimental Procedures and Operational Workflow:
The experiment investigated the dependence of RE energy distributions on the pulse durations under conditions free from pre-plasma formation. Absolute energy distributions of REs were obtained with ESM and HEXS.
5：Data Analysis Methods:
The energy distributions of REs were approximated using Maxwell–Boltzmann distribution functions with two different slope temperatures. The analysis involved comparing experimental data with computational data obtained using the 2D PIC simulation code (PICLS-2D).
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