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Laser-plasma instability (LPI) is one of the key problems in the ignition process of inertial confinement fusion (ICF), and has been extensively studied in theory, simulation, and experiment for many years. Broadband laser, due to its low temporal coherence, can reduce the effective electric field strength when interacting with plasma and disrupt the phase-matching conditions of LPI, thus an effective approach to solving LPI issues is considered. Current extensive simulation studies indicate that broadband laser can suppress the generation of phenomena such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and two-plasmon decay (TPD) to some extent. There are also a few backward scattering experimental studies, but more experimental researches, such as side-scattering, are still needed. Therefore, based on the broadband second harmonic laser facility “Kunwu”, the experiments are designed for studying the lateral scattering of critical density plasma driven by broadband laser and traditional narrowband laser, and the production of hot electrons as well in this work. The experimental results show that the side SBS spectra and side SRS spectra and portions at different angles excited by broadband lasers with a power density of 1×1015 W/cm2 are significantly different from those by narrowband lasers. Further analysis reveals that the overall portion of transverse hot electrons in broadband laser cases is higher than that in narrowband laser case. However, for broadband laser, the portion of SRS at small forward angle and backward angle are significantly lower than that for narrowband laser. Preliminary qualitative analysis suggests that SRS may not be the main mechanism for hot electron generation in this case, and that PDI might play a dominant role in generating hot electrons.
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Keywords:
- laser plasma instability /
- broadband laser /
- hot electron
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图 1 实验方案示意图
Figure 1. Sketch of the experimental setup.
图 2 实验用靶示意图
Figure 2. Schematic diagram of the target.
图 3 宽带激光与窄带激光驱动平面厚靶的25°近背向散射典型光谱
Figure 3. 25° near back-scatter typical spectra driven by broadband laser and narrowband laser.
图 4 宽带与窄带驱动平面厚靶的85°侧向散射典型光谱
Figure 4. 85° side-scatter typical spectra driven by broadband laser and narrowband laser.
图 5 宽带与窄带驱动平面厚靶的140°近前向散射典型光谱
Figure 5. 140° near forward-scatter typical spectra driven by broadband laser and narrowband laser.
图 6 不同角度的散射光能量份额 (a) SBS; (b) SRS
Figure 6. Energy information at different scattering measurement angles: (a) SBS; (b) SRS.
图 7 不同角度的超热电子产生情况 (a)能谱图; (b) 份额图
Figure 7. Hot electrons at different scattering measurement angles: (a) Energy spectrum; (b) share chart.
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