一种新的高功率微波折叠式谐振腔径向速调管振荡器

 提出一种高功率微波折叠式谐振腔径向速调管振荡器，用电子与电磁场相互作用的一维单电子模型分析了这种折叠式谐振腔径向速调管振荡器的特点。其特点为：径向尺寸小，起振电流低。用二维半PIC程序对折叠式谐振腔径向速调管振荡器进行数值模拟研究。结果表明，当二极管电压为380kV，电流为18kA时，输出微波功率峰值为1GW，主要微波频率为1.52GHz，输出微波为多频率成分微波。通过折叠式谐振腔的电子束得到很强的调制。     

Analysis of nonlinear beam-wave interaction of gyro-peniotron at harmonics

An analysis of the nonlinear beam-wave interaction of the gyro-peniotron at high harmonic is presented in this paper. It bases on a ballistic large-signal theory of the gyropeniotron assuming a given RF field distribution in the resonator. The proposed method is applicable to arbitrary harmonic numbers and to arbitrary TE modes. Analytical results of its operational characteristics are given using computer simulations. E. g. an efficiency of 45% for the third harmonic has been calculated. The results show that the gyro-peniotron could be potentially a high efficiency, high power millimeter-wave device at a low magnetic field.     

储存环相干谐波自由电子激光器新光学速调管工作状态分析

 合肥国家同步辐射实验室（NSRL）正在开展储存环相干谐波自由电子激光研究，为了在较高电子束能量下进行实验、且具有较高的相干辐射强度，光学速调管从原来的对称结构改造为非对称结构。分析了相干谐波实验中各参数之间的关系，及对相干谐波辐射的影响，并给出了两种工作状态下的最佳工作参数。     

High Order Harmonic A.C Oscillographic Chronopotentiometry

Inrecentyears,oscillographictitrationhasbecomeanewareaofelectfotitrimetricanalysis.Yet,sincetherearesomeproblemsofreproducibility,sensitivityandresolvingpowerontheoscillogram,methodoftheoscillographicdeterminationformicroortracesubstancecannotbewellusedinactualanalysis..Inordertodevelopthemethod,theauthorshavestudiedthethreebasicproblems,exploredseveralnewoscillographicmethods,andimprovedsomeoldmethods.Asaresult,theoscillographicmethodhasexceededtherangeofthetitration,andhasgrowntobetheoscillo…     

A Wiener-Wintner theorem for 1/f power spectra

Wiener's generalized harmonic analysis (GHA) provides a theory of harmonic analysis for subspaces of tempered functions not accessible to the L¹,L², and Fourier series theories; and it does it in a way that is usually more quantitative than that provided by the theory of distributions. On the other hand, GHA does not yield an adequate spectral analysis of large classes of functions, including nonstationary processes and, in particular, 1/f noise. In this paper we adapt GHA to deal with 1/f noise by extending the Wiener-Wintner theorem to the case of 1/f power spectra.     

Linear and nonlinear optical properties of hydrated and dehydrated silica micro-spheres under an electric bias

The linear refractive indices and nonlinear second-order susceptibility of hydrated and dehydrated silica micro-spheres are studied using attenuated total reflectance (ATR) and the second harmonic generation (SHG) method in direct transmission, respectively. A dramatic change of the effective dielectric constant of silica suspension under an electric bias was observed, which is attributed to particle redistribution in the fluid. Dielectric constants of dehydrated silica spheres change slightly under an electric field due to Pockels effect, for which we measure a linear electro-optical coefficient of r₃₃ ∼3.4±0.7 pm/V. The transmission second harmonic generation comes from the third-order susceptibility χ⁽³⁾, which is a coupling of two photons and the electrostatic field induced by the surface –OH charges as characterized by the Gouy-Chapman model. The SH signal from the dehydrated silica vanishes because of the loss of –OH groups on the particle surfaces. Dehydration of silica beads is irreversible. The optical properties of dried silica spheres do not recover their original hydrated state when distilled water is added.     

Generation of Exactly Solvable Non-Hermitian Potentials with Real Energies

Series of exactly solvable non-trivial complex potentials (possessing real spectra) are generated by applying the Darboux transformation to the excited eigenstates of a non-Hermitian potential V(x). This method yields an infinite number of non-trivial partner potentials, defined over the whole real line, whose spectra are nearly exactly identical to the original potential.     

伪谱-泰勒级数法在求解含时薛定谔方程中的应用--氢原子在强激光场中的高次谐波谱

给出了一种新的求解含时薛定谔方程的伪谱泰勒级数方法，该方法把氢原子的含时波函数在少量分布稀疏的网格点上做拟合．结合基于泰勒级数展开的时间演化法，用相对简单的计算得到了包括时间演化步长△t高阶项贡献的含时波函数．并将该方法用于强激光场中氢原子含时波函数和高次谐波谱的计算，得到了与经典三步模型解释以及实验现象相符的结果．     

经典失谐与量子失谐

从理论上讨论了经典和量子过程中的失谐问题。文中以一维谐振子为例详细讨论了经典和量子情况中失谐与共振问题的相似性。并证明，当外部驱动力与受力系统的内禀频率极端失谐时，外力的效应可以忽略。     

Ionization and Harmonic Generation of Diatomic Molecular Ion

l.IntroductionRecentexPerimentshavcdemonstratedthehigh-orderharmonicgenerationinraregasandmoleculargas[1~'j.TherearemanytheoreticalpaPersdealingwithharmonicgen-erationofatom[6~8j,comparativelysPeaking,theoreticalworksabouttheharmonicgen-erationofmolecuIeareless[9j,esPeciallyabouttheevolutionofionizationandharmonicgenerationwiththeinternuclearseparation,andtherelationbetweenionizationandhar-monicgeneration.InthispaPerwegivesomenumericalresultsofdiatomicmolecularionirradiatedbyalinearlyPOlari…