分光路二维剪切干涉强激光腔镜变形检测系统

介绍一种分光路二维剪切干涉光电检测系统。该系统实现了两正交方向(二维)同时进行检测与计算机自动化数据处理;采用了一系列消噪声措施和两图像相减等技术,使得波前重构中能较好地采用简单的数值积分方法;并得到了在士10μm的测量范围内,方差不超过0. 257μm和0. 05μm的灵敏度。利用该系统成功地对强激光腔镜变形过程实现了动态检测。     

热传导演示实验的改进

在教研组赵彦升老师的帮助下,我对初中物理课本第二册第46页的热传导演示实验进行了改进,效果很好,介绍如下。 1.将铝片裁成一半弯曲一半直的片条(铜、铁片也行,但不如铝片易加工),宽约2 cm,长约34cm,中间钻直径3.5mm的小孔。另做一“(?)”形的铝片条,在短边一端也钻直径约3.5mm 的小孔,用螺丝将二者固定,如下图所示。“(?)”形的长边便于夹在铁架台上。     

用于自由电子激光器的双绕螺线波荡器

研制了用于喇曼自由电子激光器的双绕螺线波荡器,测试了它的工作特性.用这台波荡器作泵浦源,获得了自由电子激光辐射,并进行了初步的参量研究.     

喇曼自由电子激光器辐射规律的实验研究

我们对喇曼自由电子激光器输出的辐射信号进行了系统的测试,获得的数据曲线与理论计算结果完全符合.由此给出了激光器最佳工作参数区域,为提高器件的运转水平创造了条件.     

CONVERGENCE OF THE APPROXIMATE SOLUTIONS TO ISENTROPIC GAS DYNAMICS

This paper gives four pairs of entropies (η_i, q_i) (i=1, 2, 3, 4) to the isentropic gas dynamics equations ρ_t+(ρu)_x=0 (ρu)_t+(ρu~2+p(ρ))_x=0 p(ρ)=k~2ρ~γ,1<γ<3。 when all the function equations are satisfied     

类环型Hulthén势任意分波束缚态的近似解析解简

类环型Hulthén势是Hulthén势外面再加上类环型平方反比势.用指数函数近似表示任意分波的离心项,运用函数分析法讨论类环型Hulthén势Schrdinger方程的束缚态解.归一化的角向波函数和径向波函数用超几何函数表示,给出了束缚态能谱,体系的波函数和束缚态能谱与类环型Hulthén势的势参数和三个量子数有关.Hulthén势、Hartmann势和Makarov势束缚态能谱是类环型Hulthén势的特例.     

高功率隔离器热致退偏分析与补偿设计

针对磁光晶体在大功率光隔离器中的应用,结合实际光学元件参数,利用琼斯矩阵分析了隔离度与入射光功率间的关系。提出基于外置材料,对磁光晶体热致退偏效应的补偿方案:针对两种不同的常见补偿材料,给出了它们的设计参数,并对两种材料的补偿效果进行对比。结果表明,在50 W的光功率下,利用CaF2晶体和SiO2,可分别提高隔离度约15dB和4dB。     

弱闭T(N)-模的预零化子的等距映射

本文刻划了弱闭T(N)-模的预零化子间的等距映射.设u,W分别为由左连续序同态N→~N和N→~N所确定的弱闭T(N)-模, u(?),W(?)分别为u,W的预零化子,Φ为由u(?)到W(?)上的线性等距映射.若(0)*=(0)#=(0),dim(0)+≠1且min{dim(H(?)~H),dim(He(?)^H)}≥2,则存在酉算子Ui,Vi(i=1,2),使得Φ(A)=U1AV*1或Φ(A)=U2A*V2*.     

Design and high-power test of 800-kW UHF klystron for CEPC

To reduce the energy demand and operation cost for circular electron positron collider (CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-kW continuous wave (CW) klystron operating at frequency of 650-MHz has been designed. The results of beam-wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional (3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been completed. When the gun operated at DC voltage of 80 kV and current of 15.4 A, the klystron peak power reached 804 kW with output efficiency of about 65.3% at 40% duty cycle. The 1-dB bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.     

Krylov subspace projection method and its application on oil reservoir simulation

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