共查询到20条相似文献,搜索用时 625 毫秒
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在神光(1012W)装置上,用1.06μm激光加热片状锗靶,用袖珍式掠入射光栅谱仪测量了类氖锗离子的3S—3P激光跃迁线的增益系数和X射线激光的传输特性,得到的结果为:波长为19.638,23.224,23.627,24.743和28.643nm的5条激光跃迁线的增益系数分别为3.06,3.99,3.72,2.36和4.59cm-1;当等离子体长度为18mm时,相应的X射线激光的发散角约为12mrad,发射X射线激光的等离子体厚度约为200μm,X射线激光峰值强
关键词: 相似文献
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X射线激光具有波长短、脉冲短、亮度高而又具有良好相干性的优点,因此在很多领域有潜在的应用前景。了解X射线激光输出的特性是对X射线激光应用研究的前提,也有必要进行深人的研究。通常情况,都是利用平焦场光栅谱仪来进行X射线激光的探测,测量诸如输出强度、发散角、折射角等参数,并且作为优化驱动条件和输出特性的依据。但是现在这种方法却有很大的局限性:因为它给出的只是在某个方向上、某个局部位置的结果,所以很难获得全面的关于X射线激光输出特性。而利用场图测量的方法, 相似文献
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分别用K边滤波和滤波-荧光法测量了激光等离子体发射的1.5—100keV的X射线连续谱。文中叙述了激光等离子体X射线能谱的测量方法和多道X射线能谱仪,介绍了激光聚变实验结果。 相似文献
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利用神光Ⅱ第九路2 ns长脉冲激光束作用厚钛固体靶,研究了产生的keV X射线源的辐射区域和总辐射功率的时间行为。结果表明:在长脉冲激光作用厚固体靶时,硬X射线线辐射功率的时间行为以及辐射体积的时间行为与激光脉冲波形一致;长脉冲时,等离子体2维膨胀效应非常显著,keV X射线线辐射的径向辐射区域在激光焦斑尺寸附近达到饱和,导致X射线线辐射功率出现饱和,且keV X射线线辐射的辐射体积正比于焦斑尺寸的3次方。从理论和实验角度研究了在同样入射激光能量下,辐射功率随激光焦斑尺寸的变化关系,发现keV X射线线辐射的饱和辐射功率正比于焦斑尺寸的5/3次方,理论结果与实验结果一致。并讨论了相同基频输出激光能量下,keV X射线辐射总功率随激光波长的变化关系,发现即使考虑了倍频效率的影响,短波长激光仍然有利于keV X射线的发射。 相似文献
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The results of Monte Carlo simulations of xenon monolayers deposited on graphite are presented. Systems of various surface densities and in a wide range of temperatures are investigated. The results are compared to the experimental data and to the previous results for nitrogen. The results of simulations are in good agreement with the experimental ones and confirm that melting in two dimensions is vacancy-driven. Typical real-space configurations of Xe atoms and calculated specific heat results are shown. 相似文献
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J.?Kova?i? T.?Gyergyek M.??er?ek 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2009,54(2):383-389
We present some results of a one-dimensional fluid model with a floating electrode immersed in plasma with magnetic field
applied at an oblique angle. The model equations are integrated numerically in order to find the space profiles of the ion
velocities and electrostatic potential for various strenghts and angles of the magnetic field. We assume a collisionless magnetized
pre-sheath with isothermal ions. The results are then compared with the spatial profiles obtained by a computer simulation.
We use a BIT1 particle-in-cell code. The simulations input parameters are chosen in the way, that they resemble the fluid
model as much as possible. Because the results of the simulation are given in the absolute SI units, they have to be normalized
correctly. We evaluate the model results and compare them with the computer simulation results. Special attention is brought
on formation of the pre-sheath with magnetic field applied at intermediate angles. The results of the simulation are in good
qualitative agreement with the model. 相似文献
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Using the tadpole improved Wilson quark action on small, coarse,
and anisotropic lattices, meson-meson scattering lengths are
calculated within quenched approximation. The study covers
pion-pion scattering in the I=2 channel and kaon-pion scattering
in the I=3/2 channel. The results are extrapolated towards the
chiral limit. Finite volume and finite lattice spacing errors are
also analyzed and results in the infinite volume and continuum
limit are obtained. Our results are compared with the results
obtained using Roy equations, chiral perturbation theory,
dispersion relations, and the experimental data. We also compare
our results with other lattice results on the scattering lengths. 相似文献
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The triple differential cross-section for K-shell ionization of silver and copper atoms by relativistic electrons have been
computed in the coplanar symmetric geometry with the inclusion of exchange effects following the multiple scattering theory
of Das and Seal [1] multiplied by suitable spinors. Present computed results are marginally improved in some cases from the
previous computed results [2]. Present results are compared with measured values [3] and with previous computation results
[2]. Some other theoretical computational results are also presented here for comparison.
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A finite element method for the solution of an axisymmetric wave propagation problem of a bar of finite length is proposed. The results are obtained for a uniform bar with (i) a displacement input and (ii) a stress input. Also results are obtained for a discontinuous bar with stress input. They are compared with the existing finite difference solutions and experimental results. It is observed that the results are in close agreement. The study is then extended to the case of bars with an hemispherical end. The advantage of using the finite element method for such problems is indicated. Finally the results for a composite bar comprising a hallow cylinder and hemisphere are obtained by using the finite element method. Experiments are conducted to verify these results. 相似文献
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分析和研究了频率对热声制冷机声压、温差和声功的影响 ;使用网络模型计算的结果与实验结果相吻合 ;该研究也是对网络模拟和声功测量方法的验证。 相似文献
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采用相位比对法模拟分析了HL-1M装置的磁扰动模式,模拟结果同预期的一致。在具有撕裂模不稳定性的典型放电中,探测到独立模m=2、3、4,耦合模m=2、3,并与用空间傅立叶分析方法得到的扰动模式的分析结果进行了比较。讨论了这些方法在实验分析中的可行性和有效性。 相似文献
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The ground state properties of superheavy nuclei are systematically
calculated by the macroscopic-microscopic (MM) model with the
Nilsson potential. The calculations well produced the ground state
binding energies, α-decay energies, and half lives of superheavy nuclei. The calculated results are systematically compared with available experimental data. The calculated results are also compared with theoretical results from other MM models and from relativistic mean-field model. The calculations and comparisons
show that the MM model is reliable in superheavy region and that the
MM model results are not very sensitive to the choice of microscopic
single-particle potential. 相似文献