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1.
基于超辐射机理相对论返波管由短脉冲电子束(脉宽几个纳秒)驱动,利用短脉冲电子束的超辐射效应能产生高峰值功率、高峰值转换效率、快速上升前沿的纳秒/亚纳秒微波脉冲。本文对近几年来国内外超辐射返波管器件实验研究进行了全面的评述,报道了超辐射返波管器件的最新进展及趋势,并指出发展中存在的一些关键问题,为开展返波管器件中的超辐射机理研究提供了详实的资料。  相似文献   

2.
将遗传算法与全电磁粒子模拟算法有机融合,研制出二维全电磁粒子模拟并行优化程序。据此对高功率微波源器件——磁绝缘线振荡器(MILO)和超辐射返波管(SRBWO)进行优化设计。将束波转换效率作为优化目标,在输入功率基本不变的情况下,优化后的磁绝缘线振荡器的效率比原模型提高38.8%;将超辐射相对论返波管的峰值输出功率作为优化目标,优化后的器件峰值输出功率比原来提高了37.5%,束波转化效率提高了50%;将超辐射相对论返波管的输出微波总能量作为优化目标,输出微波总能量比原来提高了38.1%。经优化后获取的器件模型几何参数合理,物理图像正确。  相似文献   

3.
高功率相对论返波振荡器的研究   总被引:2,自引:0,他引:2  
本文用自洽的线性场理论对相论返波管进行了分析和数值计算,预见出器件的工作频率及特性,报道了X波段相对论返波管实验结果:器件在束流1.8kA,束能450keV的相对论电子注驱动下,在中心频率9.30GHz处产生了峰值功率达100MW的微波辐射。运用全电磁的相对论的21/2维粒子模拟程序MAGIC模拟了返波管中注波互作用的非线性过程。最后对实验结果,线性理论分析结果,MAGIC模拟结果进行了全面的比较  相似文献   

4.
介绍了太赫兹频段真空电子器件的研究和开发进展,包括慢波结构理论、设计、模拟及优化,微加工和微组装技术,整管技术等。这些器件包括行波管、返波管、斜注管、止带振荡器及行波管谐波放大器等,高频结构以折叠波导慢波结构为主,在太赫兹返波管中则利用叶片加载波导慢波结构。器件技术包括微机电系统(MEMS)技术,微波等离子体化学气相沉积(MPCVD)金刚石生长、金属化和封接技术等。最后给出W波段、G波段以及340 GHz部件和器件所达到的性能。  相似文献   

5.
为了实现相对论返波管振荡器(RBWO)永磁包装,本文采用Magic模拟软件在0.5T低磁场相对论返波管(RBWO)器件结构基础上,通过在器件慢波结构末端添加一个部分反射腔,减小电子束质量对束波转换影响,即减小引导磁场的影响,实现了Ku波段相对论返波管振荡器0.3T磁场下运行.当电子束束压600kV、电子束束流7kA时,模拟得到器件输出微波功率740MW,效率18%.尽管该器件的效率低于0.5T磁场下的效率(25%),然而0.3T引导磁场在工程上更容易实现.结合小型化的脉冲功率源进行实验研究,当二极管束压580kV、束流6.5kA,实验获得功率600MW,频率13.10GHz,脉宽25ns的微波输出,该器件的研制可以促进高功率微波(HPM)系统小型化的发展.  相似文献   

6.
为了提高返波管的工作效率,本文模拟设计了一个X 波段非均匀周期慢波结构的相对论返波管。模拟结果表 明:在电压为719kV,电流为10.2kA,磁场为3.0T 条件下,微波输出功率为2.81GW,工作频率为9.04GHz,效率为 38.3%,输出模式为TM01 模。模拟结果表明,采用非均匀周期慢波结构有效地提高了器件的工作效率。论文同时模拟 研究了电子束电压对器件输出功率、效率、工作频率的影响。  相似文献   

7.
为实现X 波段的相干功率合成,提出了一种高功率的注入锁定相对论返波管模型。器件在结构上分为输入腔和 输出慢波结构:输入腔用于减少注入微波的泄漏,同时腔内的驻波电场可以有效调制电子束;输出慢波段实现调制电子 束的换能输出。模拟表明该结构在注入功率6 kW 的条件下,可以实现2.5 GW输出微波的相位控制。  相似文献   

8.
描述等离子体填充微波器件的技术背景。从分析关键技术出发,着重给出等离子体阴极电子枪、等离子体辅助电子束传输聚束、以及等离子体辅助注波互作用的概念设计。提出一种X波段等离子体填充返波管的实施方案。  相似文献   

9.
为实现基于相对论返波管振荡器的高功率微波相干合成,开展了针对锁相的低磁场返波管优化设计。通过优化中间调制腔的位置,降低工作模式的Q值,达到降低种子微波功率的目的。以外注入微波锁相方式为例,优化后的器件锁定增益大于20 dB,20 MW的注入微波功率即可实现对GW级的微波输出的相位控制。研究结果对调制电子束锁相也具有参考价值。  相似文献   

10.
首先通过粒子模拟设计了一个X波段的低磁场返波管振荡器,得到功率为520MW、频率为7.9GHz的微波输出;然后根据模拟结果设计加工了一个磁场强度为0.46T的小型化永磁磁体;最后在加速器上对永磁包装返波管振荡器进行了实验研究。当电子能量为630keV、束流约为6.7kA时,返波管振荡器得到频率为8.0GHz、功率为510MW、脉冲半高宽约15ns的微波输出。  相似文献   

11.
DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.  相似文献   

12.
This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel's.  相似文献   

13.
The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.  相似文献   

14.
Today, micro-system technology and the development of new MEMS (Micro-Electro-Mechanical Systems) are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.  相似文献   

15.
The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.  相似文献   

16.
From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.  相似文献   

17.
It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.  相似文献   

18.
Waveguide multilayer optical card (WMOC) is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling & processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic (VB) language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.  相似文献   

19.
The effect of laser microbeam trapping the bioparticles has been appfied widely in the biology .However the micromechanism of the acting that realizes the laser-microbeam trapping bioparticles is still lacking. In this paper ,the act microchenism of the gradiant force of laser microbeam for the bioparticles is analysed by means of quantum theory ,The result accords with our experiment.  相似文献   

20.
In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal (200) (2d = 0.4027 nm) is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line(w), the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line(x), the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines(y), the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line(z) in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line(q) in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution(λ/△ 2) is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.  相似文献   

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