Spatially and temporally discontinuous two-plasmon decay with relatively low laser irradiance

Kang Ning; Liu Huiya; Lei Anle; Ji Shengzhe; Zhou Shenlei

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Spatially and temporally discontinuous two-plasmon decay with relatively low laser irradiance

机译：具有相对低的激光辐照度的空间和时间不连续的双量离子衰减

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摘要

The direct-drive inertial confinement fusion scheme with a gradually increasing intensity nanosecond pulse needs to avoid fuel preheating during the low-temperature implosion stage, in which the occurrence and characteristics of two-plasmon decay with low laser intensity is worthy of attention as it produces hot electrons that preheat the fuel. In this paper, we present experimental results regarding the occurrence and characteristics of two-plasmon decay inferred from the observation of three-halves harmonic light under an irradiance of similar to 1 x 10(13) W cm(-2), with which three plasma density scale-lengths were obtained using different laser pulses. Spatial and temporal discontinuities of the laterally emitting three-halves harmonic light in both the parallel and the perpendicular directions with respect to the target surface were observed, which are interpreted by laser filamentation analyses based on plasma parameters calculated from the measured spectra and interferograms, and supported by radiation hydrodynamics and particle-in-cell simulations. From the perspective of filamentation, suppression methods of the observed phenomena under such conditions are discussed.

机译：采用强度逐渐增加的纳秒脉冲的直接驱动惯性约束聚变方案需要避免低温内爆阶段的燃料预热，在低温内爆阶段，两个低激光强度的等离子体激元衰变的发生和特征值得注意，因为它会产生热电子预热燃料。在本文中，我们给出了在类似于1×10（13）W cm（-2）的辐照度下观察到的三个半谐波光的两个等离子体子衰变的发生和特征的实验结果，使用不同的激光脉冲获得了三个等离子体密度标度长度。在平行和垂直方向上观察到横向发射的三个半谐波光相对于目标表面的空间和时间不连续性，这些不连续性通过基于测量光谱和干涉图计算的等离子体参数的激光细丝分析进行解释，并得到辐射流体力学和细胞内粒子模拟的支持。从成丝的角度，讨论了在这种条件下抑制观察到的现象的方法。

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来源
《Plasma physics and controlled fusion》 |2020年第12期|共10页
作者
Kang Ning; Liu Huiya; Lei Anle; Ji Shengzhe; Zhou Shenlei;
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作者单位

Chinese Acad Sci Joint Lab High Power Laser &

Phys Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Chinese Acad Sci Joint Lab High Power Laser &

Phys Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Chinese Acad Sci Joint Lab High Power Laser &

Phys Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Chinese Acad Sci Joint Lab High Power Laser &

Phys Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

Chinese Acad Sci Joint Lab High Power Laser &

Phys Shanghai Inst Opt &

Fine Mech Shanghai 201800 Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类等离子体物理学;
关键词
two-plasmon decay; three-halves harmonic measurement; laser filamentation;

机译：双量离子衰减;三半谐波测量;激光丝;

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专利

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机译：均质等离子体中两等离激元衰变的时空演化
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机译：在恒定辐照度下以不同脉冲能量产生的激光诱导等离子体的时空尺度和共同的视在激发温度
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机译：通过激光频率失谐抑制两等离子体衰减
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机译：在真空和环境气体中的低温激光诱导的等离子体中的空间和时间分辨的排放强度和数量密度
9. Simultaneous spatially and temporally resolved laser induced incandescence and laser induced fluorescence measurements in jet propulsion fuel 8 and heptane pool fires. [D] . Henriksen, Tara Leigh. 2008

机译：在喷气推进燃料8和庚烷池火中同时进行空间和时间分辨的激光诱导的白炽和激光诱导的荧光测量。
10. Temporal and spatial characterization of nonsense-mediated mRNA decay [O] . Tatjana Trcek, Hanae Sato, Robert H. Singer, 2013

机译：废话介导的mRNA衰变的时空特征
11. Time evolution of stimulated Raman scattering and two-plasmon decay at laser intensities relevant for shock ignition in a hot plasma [O] . G. Cristoforetti, L. Antonelli, D. Mancelli, 2019

机译：激光强度刺激拉曼散射的时间演变与热等离子体震动点火相关的激光强度
12. Effect of Self-Generated Magnetic Field on the Two-Plasmon Decay Instability in a Laser-Produced Plasma [R] . Salimullah, M., Ahmed, M. 1985

机译：自生磁场对激光等离子体中双等离子体衰变不稳定性的影响

Spatially and temporally discontinuous two-plasmon decay with relatively low laser irradiance

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