研究目的
Investigating the effects of laser-driven shock waves and hot electrons generated at high intensities on hydrodynamics.
研究成果
The experiment demonstrated that laser-driven shock waves at high intensities are strongly impacted by noncollisional mechanisms, with hot electrons playing a crucial role in determining shock dynamics. The findings suggest that hot electrons can significantly increase shock pressure and velocity, which could be beneficial for shock ignition scenarios if preheat upstream of the shock front can be suppressed.
研究不足
The study is limited by the specific conditions of the PALS laser system and the planar geometry of the experiment. The impact of noncollisional processes and the role of hot electrons are significant but may vary under different experimental conditions.
1：Experimental Design and Method Selection:
The experiment was performed at the Prague Asterix Laser system (PALS) using the fundamental frequency of the laser (1315 nm) to launch a strong shock in planar geometry. The methodology included characterizing shock waves and hot electrons generated at intensities of ’ 1016 W/cm
2：Sample Selection and Data Sources:
Two-layer targets with a front layer of Polystyrene (CH) of variable thicknesses, ranging from 10 μm to 180 μm, followed by 5 μm of Titanium were used.
3：List of Experimental Equipment and Materials:
The PALS laser system, Random Phase Plate (RPP) for beam smoothing, and various diagnostics including Streaked-optical-pyrometry (SOP), focusing spectroscopy with spatial resolution (FSSR), spherical crystal imaging (SCI), time integrated optical spectroscopy (OS), calorimetry (Cal), and a bremsstrahlung cannon (BC).
4：Experimental Procedures and Operational Workflow:
The laser beam was smoothed with an RPP providing a Gaussian focal spot of ’100 μm (FWHM). The targets were irradiated, and diagnostics were used to measure shock dynamics and hot electron effects.
5：Data Analysis Methods:
Data from diagnostics were analyzed to characterize shock waves and hot electrons. Numerical simulations were performed with the hydrodynamic code CHIC to interpret experimental results.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容-
Prague Asterix Laser system (PALS)
Used to launch a strong shock in planar geometry.
-
Random Phase Plate (RPP)
Used for beam smoothing.
-
Streaked-optical-pyrometry (SOP)
Used to characterize dynamics of the shock waves.
-
Focusing spectroscopy with spatial resolution (FSSR)
Used to characterize Ka emission generated by interaction of hot electrons with tracer layers buried in the target.
-
Spherical crystal imaging (SCI)
Used to characterize Ka emission generated by interaction of hot electrons with tracer layers buried in the target.
-
Time integrated optical spectroscopy (OS)
Used to study parametric instabilities.
-
Calorimetry (Cal)
Used to study parametric instabilities.
-
Bremsstrahlung cannon (BC)
Used to record bremsstrahlung emission.
-
登录查看剩余6件设备及参数对照表
查看全部
