研究目的
To enhance the brilliance of a laser-produced soft X-ray source for gaseous target concepts by inducing supersonic effects in the gas jet, leading to a local increase of the particle density.
研究成果
The study demonstrates a method to improve the brilliance of laser-produced plasmas based on gas targets by utilizing a background pressure to induce a barrel shock in the supersonic jet, leading to a recompression of target particles. This results in a smaller, more uniform plasma with increased photon emission, achieving a brilliance improvement by a factor of 10. Further improvements may be possible with better differential pumping systems and alternative background gases like hydrogen.
研究不足
The study is limited by the spatial resolution of the wavefront sensor, which may not fully resolve high density values right behind a shock. Additionally, the use of helium as a background gas, while advantageous for its transmissivity, may not be the optimal choice for minimizing reabsorption of generated photons.
1：Experimental Design and Method Selection:
The study involves the use of a laser-produced plasma (LPP) source with gaseous targets, specifically focusing on inducing supersonic effects in the gas jet to increase particle density.
2：Sample Selection and Data Sources:
Nitrogen gas is used as the target material, expanded from a high-pressure vessel into a vacuum or low-pressure helium atmosphere.
3：List of Experimental Equipment and Materials:
A piezoelectrically operated Proch–Trickl gas valve, a Nd:YAG laser (InnoLas SpitLight 600), a CCD camera (Lumenera Lu160M), and a Hartmann-Shack wavefront sensor are among the key equipment used.
4：Experimental Procedures and Operational Workflow:
The gas jet is expanded through a divergent nozzle, and the laser is focused into the gas to produce plasma. Schlieren imaging and wavefront measurements are used to characterize the gas jet and plasma.
5：Data Analysis Methods:
The particle density distribution is recovered from wavefront measurements, and the plasma is characterized using a pinhole camera and a calibrated photodiode.
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