共查询到20条相似文献,搜索用时 26 毫秒
1.
Tripathi V.K. Liu C.S. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1989,17(4):583-587
A simple calculation of a free-electron laser in the Compton regime that uses a dielectric-lined waveguide is presented. The introduction of a dielectric lining in a free-electron laser considerably reduces the requirements on beam voltage for generating a given frequency ω1=k 0c/(1 - vb η/c), where k 0 is the wiggler wave period η is the effective index of refraction (1<η<√ϵ) and ϵ is the permittivity. The system supports electromagnetic waves whose Poynting flux is largely concentrated in the dielectric; hence the electron beam is required to propagate close to the dielectric lining. The mode structure and dispersion behavior of the guiding system without the beam are discussed. a thin annular beam is introduced, and a perturbation theory is used to obtain the frequency and growth rate of radiation 相似文献
2.
Ramachandran K. Tripathi V.K. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1997,25(3):423-426
A long wavelength Langmuir wave (ω0, k0), propagating through a parabolic plasma density channel, can decay into a low-frequency mode (ω,k&oarr;) and two short wavelength Langmuir wave sidebands (ν1,2,k&oarr;1,2 ), via two-stream instability where ω1,2=ω∓ω0 and k&oarr;1,2=k&oarr;∓k&oarr;0. Depending on the mode number n, the growth rate maximizes in the range γmax≃0.1ωpi-0.4ωpi for the range of k from 0.1(ωpi/cs) to 0.2(ωpi/cx) for ν0~νth where ν0 and νth are the oscillatory and thermal velocities of electrons, ωpi is the ion plasma frequency on the axis, and cs is the sound speed. The growth rate increases with the width a of the plasma density channel. It decreases with the mode number. The instability may be relevant to laser based charged particle accelerators 相似文献
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对于玻璃珠组成的颗粒介质样品,本文测量了横波和纵波声速,同时分析了剪切模量(G)与体积模量(B)的比值(G/B)随压强的变化规律.结果表明,在低压强下,颗粒体系的纵波声速(C_L)明显大于横波声速(c_T),且体系的CL,CT及G/B均随压强p变化呈幂律标度,即CL∝p~(0.3817),CT∝p~(0.2809)G/B∝p~(-0.4539),幂指数与文献[1]中预言的-1/2非常接近,暗示在我们实验压强范围内的颗粒样品处于L玻璃状态.此外,本文还利用快速傅里叶变换法测量了玻璃珠样品中的声学衰减特性及二阶谐波随压强的变化,发现:纵波声衰减系数(α)、接收端二倍频振幅(μ_(2ω))与基频振幅(μ_(1ω))平方的比值(μ_(2ω)/μ_(1ω)~2)均随压强的增大而幂率减小,分别为α∝p~-(-0.1879),和μ_(2ω)/μ_(1ω)~2∝p~(-0.866). 相似文献
5.
Tripathi V.K. Liu C.S. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1990,18(3):466-471
The introduction of a plasma and a strong guide magnetic field in a free electron laser (FEL) slows down the phase velocity of radiation, significantly reducing the requirements on beam energy for generating frequencies below the electron-cyclotron frequency (ω1≲ωc). Around plasma resonance (ω1~ωp), the FEL mode couples to two-stream instability (TSI), attaining a large growth rate, comparable to that of the wiggler-free TSI. At plasma densities comparable to beam density, the beam-induced local depression in the electron density of the plasma acts as a waveguide for guiding any high-frequency radiation when the beam current is ≳17 kA 相似文献
6.
从繁流放电理论可直接导出热阴极电离真空计的特性方程,证明通常的概念即在热计的电子流ie一定时其离子流i+与压强P成正比的关系,只在离子流甚小于电子流时才能成立。在被测气体的压强较高时,离子流和压强之间呈现下列指数关系: i+/ie=1-e(-(K1P-K2P2))(K1及K2为常数),且随着压强的增长而逐步趋于饱和。进一步的推导则得出,当容许测量误差为1%时,热计的线性上限(临界压强)为Pc=0.22/Г,此处Г为热计的灵敏度。这种理论可以容易地解释近年来一些实验工作者例如Nottingham,Schultz,Goto,Hinzpeter等的实验结果。此外我们还使用了特殊设计的“封闭式”电离计作实验,得到的结果和理论预计十分符合。这种电离计本身则可用作10-7~0.6托的宽程量具。
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7.
San-Kui GOU 《理论物理通讯》1992,17(4):485-486
The space-charge effects are analysed and five kinds of fluid waves are obtained in the e-beam density and the axial-current density for an electromagnetically pumped free-electron laser with an axial-guide magnetic field by using the cold-fluid theory. To enhance the gain, the guide field Bo must be in this regime: -2(ωυ + cβx0kω) < Ω < -(ωυ + cβx0kω), where Ω0 = eB0/mr0 and ωυ(kω) is the frequency (wave number) of the wiggler. 相似文献
8.
Ramachandran K. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1996,24(2):487-489
A high-power linearly polarized laser propagating through a plasma produces oscillatory electron velocity at the second harmonic due to-the ν&oarr;×B&oarr; force, This velocity couples a Langmuir wave (ω, k&oarr;) and an electromagnetic wave (ω1, k&oarr;1), where ω1=ω-2ω0 , k-2k&oarr;0 and ω0, k&oarr;0 are frequency and wavenumber of the laser pump, causing second harmonic Raman scattering. The growth rate is maximum for side scattering. This process can occur above the quarter critical density, unlike the first harmonic stimulated Raman scattering which occurs below the quarter critical density 相似文献
9.
Using the bosonic numerical renormalization group method, we studied the equilibrium dynamical correlation function C(ω) of the spin operator σ_z for the biased sub-Ohmic spin-boson model. The small-ω behavior C(ω) ∝ω~s is found to be universal and independent of the bias ε and the coupling strength α(except at the quantum critical point α = αc and ε = 0). Our NRG data also show C(ω) ∝χ~2ω~s for a wide range of parameters, including the biased strong coupling regime(ε = 0 and α α_c), supporting the general validity of the Shiba relation. Close to the quantum critical point αc,the dependence of C(ω) on α and ε is understood in terms of the competition between ε and the crossover energy scale ω_0~*of the unbiased case. C(ω) is stable with respect to ε for ε《ε~*. For ε》ε~*, it is suppressed by ε in the low frequency regime. We establish that ε~*∝(ω_0~*)~(1/θ)holds for all sub-Ohmic regime 0≤s 1, with θ = 2/(3s) for 0 s≤1/2 and θ = 2/(1 + s) for 1/2 s 1. The variation of C(ω) with α and ε is summarized into a crossover phase diagram on the α–ε plane. 相似文献
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A multireference configuration interaction (MRCI) study has been carried out on the LiCl molecule. The potential energy has been calculated over a wide range of internuclear separation for the 21 low-lying electronic states of the LiCl molecule dissociating into Li (2S, 2P, 3S)+Cl(2P). The (4)1Σ+, (3)1Π, 1-33Σ+, 1-33Π, 1,3Δ, 1,3Σ-, (5)1Σ+, (4)3Σ+, (4)1Π, (4)3Π excited states are studied for the first time in theory. Molecular spectroscopic constants (Re, De, ωe, ωeχe, Be and αe) have been derived for the 9 bound states (X1Σ+, (3)1Σ+, (2)1Σ+, 1,3Δ, 1,3Σ-, (4)1Π, (4)3Π) with a regular shape, and the spectroscopic constants of ground states X1Σ+ are in good agreement with available experimental and theoretical values. The relative differences between experimental values and our values for Re, De, ωe, ωeχe, Be and αe are 1.02%, 0.60%, 1.72%, 9.46%, 2.0%, and 0.75%, respectively. Moreover, vibrational levels of 9 bound states, which have not been investigated experimentally, are computed. 相似文献
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Andreev N.E. Kalmykov S.Y. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(4):1106-1115
Spectral features of a large-angle stimulated Raman scattering (LA SRS) of a short electromagnetic pulse in an underdense plasma, which are caused by the presence in a plasma of a given linear long-wavelength electron plasma wave (LW EPW), are investigated. It is shown that the LW EPW, whose phase velocity coincides with a group velocity of a pulse and a density perturbation normalized to a background electron density δnLW/n0 exceeds the ratio of the electron plasma frequency to the laser frequency ωpe/ω0 suppresses the well-known Stokes branch of the weakly coupled LA SRS. Under the same condition, the anti-Stokes band appears in the spectrum of the scattered radiation. Variation of a scattering angle and an electron temperature do not significantly modify qualitative features of the effect. In the case of strongly coupled LA SRS, the maximum of the increment is decreased by nearly one-half for δnLW/n0~(a0ωpe /ω0)2/3≫ωpe /ω0, where a0 is an amplitude of an electron quiver velocity in the laser field normalized to a speed of light c, and it decreases further with an increase in plasma density perturbation in LW EPW 相似文献
12.
Gray P.C. Hudson M.K. Lotko W. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(6):745-755
Particle simulation in a one-dimensional bounded system is used to examine the formation of acoustic double layers in the presence of two ion species. Double-layer formation depends critically on the details of the distribution functions of the supporting ion populations, and their relative drifts with respect to the electrons. The effect of having two ion components, an H+ and an O+ beam, on double-layer evolution from ion acoustic turbulence driven by an electron drift relative to the H+ beam of ≈0.5u e, where u ue is the electron thermal speed, is examined. The ratio of ion drifts is taken to be consistent with acceleration by a quasi-static auroral potential drop (i.e. V H/V O=√M O/ M H=4.0). Acoustic double layers form in either ion species on the time scale τ≈100ωps-1, where ωps is the ion plasma frequency for species `s' and s =H or O, and for drifts relative to the electrons lower than that required for double layer formation in simulations of single ion component plasma 相似文献
13.
研究了四价铬离子掺杂的MgCaBa-铝酸盐玻璃在近红外区的发射光谱,既有源于1E—3A2跃迁,位于1.18μm处的窄带,又有源于3T2—3A2范围在1.1~1.4 μm内的宽带,利用ASE(Amplified Spontaneous Emission)方法研究了其增益特性,测量了在 632.8nm激发下不同激发长度下的发射光谱,得到其光学增益系数在1.18μm和1.24 μm处分别为BE=(0.7±0.04)mm-1和BT=(0.05±0.005)mm-1,并根据这种材料的光谱性质,对其作为近红外可调谐激光介质的可能作出评估。 相似文献
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BeC是一个具有丰富低激发电子态的分子,本文基于动态权重完全活性空间自冾场方法获得的参考波函数,采用多参考组态相互作用方法对BeC分子进行高精度的从头计算,获得了BeC分子X~3Σ~-,A~3Π,b~1Δ,c~1Π和d~1Σ~+共5个电子态的势能曲线.为了获得精确的光谱结果,在计算中考虑了标量相对论效应修正,并把相互作用能外推至完全基组极限.在此基础上获得了这些态的光谱常数和偶极距,以及一些允许跃迁的跃迁偶极距、弗兰克-康登因子和辐射寿命.最后,通过扩展的Rydberg函数拟合获得了基态势能曲线精确的解析表达式. 相似文献
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Ultrafast structural dynamics using time-resolved x-ray diffraction driven by relativistic laser pulses 下载免费PDF全文
《中国物理 B》2021,30(9):98701-098701
Based on a femtosecond laser plasma-induced hard x-ray source with a high laser pulse energy( 100 mJ) at 10 Hz repetition rate,we present a time-resolved x-ray diffraction system on an ultrafast time scale.The laser intensity is at relativistic regime(2 × 10~(19) W/cm~2),which is essential for effectively generating K_α source in high-Z metal material.The produced copper K_α radiation yield reaches to 2.5 × 10~8 photons/sr/shot.The multilayer mirrors are optimized for monochromatizating and two-dimensional beam shaping of K_α emission.Our experiment exhibits its ability of monitoring the transient structural changes in a thin film SrCoO_(2.5) crystal.It is demonstrated that this facility is a powerful tool to perform dynamic studies on samples and adaptable to the specific needs for different particular applications with high flexibility. 相似文献
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对ZBLAN氟锆酸盐玻璃中Pr3+掺杂离子3P0和1D2能级的寿命和发光特性进行了较详细的光谱学研究。首先测量了两种掺杂浓度(质量分数分别为1×10-3,5×10-3)的Pr3+:ZBLAN玻璃的吸收光谱,然后运用时间分辨激光光谱技术测量了3P0和1D2能级在激光单光子共振激发下的荧光发射谱和能级寿命。将不同荧光发射谱带的强度和文献报道的Judd Ofelt理论计算辐射跃迁几率数值做了比较分析,证明了文献中理论计算结果的可靠性。由于浓度猝灭效应,在相同的激发条件下,掺杂浓度为1×10-3样品的荧光发射强度明显大于5×10-3样品的荧光发射强度。但是从我们的测量结果看,掺杂浓度对3P0和1D2 的能级寿命值无显著影响。掺杂浓度为1×10-3时,Pr3+离子3P0和1D2能级的寿命值分别为46,322μs。 相似文献
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D'Angelo N. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(5):568-569
The ion-ion hybrid mode, with frequencies ω≈(ωc+ωc-)1/2, is briefly analyzed for a warm plasma containing positive ions (gyrofrequency ωc+), negative ions (gyrofrequency ωc-), and electrons. Experiments with SF6 - as the negative ion are proposed 相似文献
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采用反应离子束溅射和后退火处理技术在石英玻璃基底上制备了具有纳米粒子的二氧化钒(VO2)薄膜. 该薄膜具有半导体-金属相变特性,在3 μm处的开关率达到76.6%。 热致相变实验结果给出了准确的最佳退火温度为465 ℃. 仿真、热致相变和光致相变实验都显示VO2薄膜在红外波段具有很高的光学开关特性. 光电池防护实验结果显示VO2薄膜将硅光电池的抗干扰能力提升了2.6倍, 证明了VO2在激光防护中的适用性. 采用连续可调节系统研究得到VO2在室温条件下的相变阈值功率密度为4.35 W/cm2, 损伤阈值功率密度为404 W/cm2。 低相变阈值和高损伤阈值都进一步证明VO2薄膜适用于激光防护系统。本实验制备的VO2薄膜在光开关、光电存储器、智能窗等方面也具有广泛的应用价值. 相似文献
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Demura A.V. Oks E. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1998,26(4):1251-1258
Measurements of magnetic fields based on observations of the Zeeman splitting ωB of spectral lines is a virtually impossible task in dense plasmas of powerful Z-pinches where the Stark splitting in the ion microfields ωF is much greater than ωB. In this situation, much better diagnostics of magnetic fields can be achieved through polarization difference contours obtained by subtracting profiles of the same spectral line observed in two orthogonal linear polarizations. In this way the obscuring role of the Stark effect is significantly diminished. In the present paper it is shown that the most sensitive and accurate measurements of the magnitude and the direction of the magnetic field in a dense plasma can be conducted employing central Stark components of hydrogen or hydrogen-like spectral lines. The polarization contour of a central Stark component turned out to be much more sensitive to the magnetic field than the polarization contour of a lateral component of the same line, namely by a factor of (ωF/ωB) 3≫1. This constitutes a drastic enhancement of the previously suggested method that had used the polarization contour of a lateral Stark component because in dense plasmas a typical value of the above factor is (ωF/ωB)3⩾103 . The new method can also be used for laser fusion plasmas and for some astrophysical objects such as magnetic white dwarfs 相似文献