共查询到17条相似文献,搜索用时 46 毫秒
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本文导出了法向入射时,稳态激光等离子体中的电场强度和等离子体标度长度的解析表达式,揭示了达到稳态所需的时间对入射光场强的依赖关系.所得的结果与实验和计算机模拟很好地符合. 相似文献
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本文从理论上详细地研究了双频激光在等离子体中的共振自聚焦。本章从流体方程出发,导出了双频激光驱动下等离子体的非线性介电常数,从而清楚地展示了等离子体波有质动力的影响。接着,具体地处理了等离子体纵向静电场,进而反映出共振自聚焦的具体特征。最后还讨论了共振自聚焦对拍频波加速器中粒子加速过程的影响。 相似文献
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讨论高斯型强激光束在具有初始柱对称密度分布的低密度冷等离子体中传播时,等离子体密度分布的不同对激光自聚焦的影响.推导出可以判断更有利于自聚焦发生的评价函数,这样通过比较不同密度分布的评价函数值就可以判断哪种密度分布更有利于自聚焦的发生.为了说明这种方法的有效性,对评价函数进行分析得出:在相同的激光场中等离子体柱的轴心密度给定时(以激光的光轴为轴),离轴越远的地方密度越大及密度变化越陡,自聚焦越容易发生;相对论效应与有质动力共同作用比相对论的单独作用,自聚焦更容易发生.数值模拟证实了评价函数能准确的预测在不
关键词:
自聚焦
相对论效应
有质动力
评价函数 相似文献
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冯贤平 《核聚变与等离子体物理》1988,(2)
本文在临界密度区域内激光场趋于零的假设下,系统地研究了由强激光辐照非均匀等离子体引起临界密度变陡的现象,给出了较为精确、完备的描述等离子体密度结构的各种参数和等离子体密度的坪台结构。 相似文献
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The problem of electron acceleration by a localized,high frequency electric field has been further investigated by using single particle orbit computations and the resonant field. The computational results obtained can give a better explanation to the phenomena observed in experiments and in particle simulations,it indicates that,the Localized field occurring in resonant absorption behaves more Like a travelling wave, and the resonance of the field with electrons in the critical density region can account for the generation of energetic electrons. 相似文献
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In this paper, the authors consider a more realistic case of linear density profile for laser-irradiated plasma, and obtain the field structure over the whole coronal region by directly solving the wave equation with numerical method. The dependence of the field structure .on the wavelength of incident Laser light, the initial scale length of the density profile and the magnitude of the magnetic field is studied. In addition, the resonant absorption is also discussed for the above cases. The results are in good agreement with those obtained by computer simulations. 相似文献
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The relationship between the transported ion current and the cathodic arc current is determined in a vacuum arc plasma source equipped with a curved magnetic filter. Our results suggest that the outer and inner walls of the duct interact with the plasma independently. The duct magnetic field is a critical factor of the plasma output. The duct transport efficiency is to maximize at a value of bias plate voltage in the range +10 V to +20 V, and independent (within our limit of measurement) of the magnetic field strength in the duct. The plasma flux is composed of two components: a diffusion flux in the transverse direction due to particle collisions, and a drift flux due to the ion inertia. The inner wall of the magnetic duct sees only the diffusion flux while the outer wall receives both fluxes. Thus, applying a positive potential to the outer duct wall can reflect the ions and increase the output current. Our experimental data also show that biasing both sides of the duct is more effective than biasing the outer wall alone. 相似文献
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原则上,激光腔中相干光的强度应由往返光束按场强叠加计算。本文比较按场强叠加和通常按光强叠加的计算,指出:腔中各处的饱和增益和光强确有可观的偏差,但场分布和输出功率很好地相符。
关键词: 相似文献