共查询到20条相似文献,搜索用时 109 毫秒
1.
ProposalforEfficiencyEnhancementofaFarInfraredFreeElectronLaser¥HUSuxing;FUEnsheng;XUZhizhan(ShanghaiInstiuteofOpticsandFineM... 相似文献
2.
AQuenchedDyeLaserPumpedbyaKrFExcimerLaser¥XUEShaolin;LOUQihong;HUANGHuijie;DULonglong(ShanghaiInstituteofOpticsandFineMechani... 相似文献
3.
Generation of Fundamental Dark Soliton Train in Positive Dispersion-decreasing Fibers 总被引:1,自引:0,他引:1
XU Wencheng WEN Shuangchun) GUO QiLIAO Changjun LIU Songhao 《Chinese Journal of Lasers》1997,6(6):533-538
GenerationofFundamentalDarkSolitonTraininPositiveDispersiondecreasingFibersXUWenchengWENShuangchun1)GUOQiLIAOChangjunLIUSon... 相似文献
4.
SuppressionofInterferenceSpecklesintheUniformLineFocusSystemofSegmentedWedgeArrayUsingPhase-disturbedPlate¥LIUZhongyong;ZHENG... 相似文献
5.
XIE Yong XIE Shizhong LIU FenghaiWANG Hui ZHOU Bingkun 《Chinese Journal of Lasers》1998,7(2):172-179
ImpactofLaserLinewidthonPerformanceofExternalyModulatedOpticalTransmisionSystemsXIEYongXIEShizhongLIUFenghaiWANGHuiZHOUBingku... 相似文献
6.
CHEN Changmin 《Chinese Journal of Lasers》1996,5(6):547-550
ANewLaserFrequency-stabilizingandFrequency-lockingSystem¥CHENChangmin(DepartmentofElectronicandInformationTechnology,ShanxiUn... 相似文献
7.
LIZun-ying SONGYi-zhong 《原子与分子物理学报》2001,18(3):265-268,272
1 INTROEXPERIMENTExperimentalsetupwasshowninFig .1,exhaustivedescriptionsonthesetupandtheprocessofacquiringdatahasalready giveninrelativedocument[1] ,nowwedoexcessivedescriptionnolonger .2 RESULTANDDISCUSSIONResult:earlierspectraoftheplasmaradiatingwereshow… 相似文献
8.
Y. K. Zhu 《核聚变与等离子体物理》1996,(3)
DEUTERIUMINFLUXPROFILEALONGTHEAPEXOFTHEUPPERX-POINTTILESINJET¥Y.K.Zhu(SouthwesternInstituteofPhysics,P.O.Box432,Chengdu610041... 相似文献
9.
TheoryofRamanScatteringinIntenseShortPulseLaserPlasmas¥SHENBaifei;YUWei;ZENGGuihua;XUZhizhan(ShanghaiInstituteofOpticsandFine... 相似文献
10.
ElectricFieldAnalysisofNon-coplanarElectrodesinElectroopticModulatorwithaRidgeWaveguideStructure¥ZHOUYi;YUYang;QIUWei;CHENYix... 相似文献
11.
12.
考虑了当射频调制的超短脉冲电子束径向长度远小于辐射波长时,将其理想化为δ时间函数,提出了用波导本往模展开的方法来计算矩形波导中超短脉冲电子束的相干同步辐射及其频率特性。结果表明:(1)当谐振频率等于调制电子束微脉冲时间隔的射频的整数倍时,辐射模式表现为“纯”的波导本征模。(2)波导效应使得超短脉冲电子束在两个频率处发生相干同步辐射,而且低频支的辐射功率高于高频支的。最后指出波导自由电子激光器单横模 相似文献
13.
14.
给出了0.14 THz高功率单次脉冲信号的频率和功率的测量方法及实验结果。针对高功率太赫兹脉冲频率高、峰值功率高和脉宽短的特点,实验中采用了截止波导滤波法与谐波混频法相结合的方式准确测定了脉冲信号频率,利用辐射场功率密度积分法获取了辐射脉冲的远场功率分布,并给出了单次脉冲的辐射功率。某实验条件下的测量结果表明,0.14 THz高功率太赫兹脉冲的频率为0.146 3 THz,脉宽约为1.5 ns,功率不小于0.5 MW。 相似文献
15.
Kosai H. Garate E.P. Fisher A. Main W.T. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(3):288-292
An X -band dielectric Cerenkov maser amplifier experiment is reported. The amplifier system consisted of a solid, thermionically generated electron beam propagating through a cylindrical waveguide partially filled with an annular, dielectric liner. The input signal was provided by a tunable (9-10.3 GHz) magnetron with power up to 10 kW. Electron beam voltages and currents of up to 250 kV and 100 A could be generated for 1 μs pulse durations. The system was configured to operate in the TM01 mode of the dielectric-lined waveguide. In this experiment the gain of the system with respect to the length of the dielectric liner was studied at a fixed input frequency of 10.3 GHz. At electron beam parameters of 160 kV and 60 A, a power gain of 24 dB over 56 cm of interaction length was measured for an input power of 4.5 kW, corresponding to a maximum RF amplified power of 1.15 MW and 12% efficiency 相似文献
16.
Santoru J. Butler J.M. Goebel D.M. Schumacher R.W. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1994,22(5):593-599
Short-pulse, ultra-broadband sources of RF radiation are needed for a variety of new applications. To meet this demand, we have developed and optimized a single-beam Plasma Wave Tube (PWT), The PWT is a unique microwave/millimeter-wave source which utilizes the interaction between beamexcited electron plasma waves to generate kilowatt-power (~10 kW) radiation at microwave to millimeter-wave frequencies with a beam-to-radiation conversion efficiency of ⩾0.4%. In a single-beam PWT, an electron beam (⩽40 kV, ⩾200 A, 5-to-20-μs pulse width) is injected into a gas-filled (e,g., hydrogen) cylindrical waveguide. The beam first ionizes the gas to generate a plasma, and then nonlinearly interacts with the plasma to generate radiation from 6-to-60 GHz. Slew rates of up to 7 GHz/μs have been measured during a single beam pulse. The radiation has a wide instantaneous bandwidth, typically 10 GHz or wider. Electron-beam transport through the waveguide is accomplished with no externally applied magnetic fields because the beam space charge is cancelled by the background plasma 相似文献
17.
Recent advances in the physics and technology of the modulated intense relativistic electron beams (IREB's) are reviewed in this paper. Bunched dense electron beams can be used to construct high-power RF sources, which may critically affect future progress in fusion technology. In this paper a system is described in which electrical energy can be converted from a single pulse of relatively long duration into a series of subpulses of short duration (nanosecond and subnanosecond) and of high power (~1010 W). This electrical system consists of an IREB propagating through passive structures. The mutual interaction between the electron beam and one passive structure modifies the IREB so that power compression and beam modulation occur. When the modified IREB interacts with the next passive structure, the kinetic energy of the electrons is converted into electrical energy or RF energy. The beam current modulation depends on the injected IREB and the structure parameters. A 100-percent modulation of the current has been achieved. A single-beam source may be used for exciting radiation in a frequency range of 60 MHz to 10 GHz. In the frequency range of 60-750 MHz a modulated beam with power ~1010 W has already been achieved. IREB modulation at a frequency of ~3 GHz was performed and RF energy was extracted from the bunched beam with power output of 5 × 108 W. 相似文献
18.
Chang-Sing Hwang Mien-Win Wu 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1993,21(2):239-242
A radially extracted vircator (virtual-cathode oscillator) with two identical opposite output ports is presented. The microwave modes propagating inside the WR650 output rectangular waveguide are determined by the calibrated E -probes lined up in the direction perpendicular to the axis of the WR650 waveguide. Velvet-covered cathodes are used to emit electrons. Several diameters of velvet are chosen to see how the emitting area effects microwave generation. Evidence of virtual cathode formation, onset of electron reflexing, and simultaneous microwave emission are discussed. This vircator is found to have the capability of generating a maximum 1.4 GW microwave pulse with the dominant frequency at 8.2 GHz. The radiation pattern is dominated by the TE10 mode and the instantaneous efficiency for producing this microwave pulse is around 6±0.8%. Simple E-probes are applied to pick up the microwave signals inside the WR650 output rectangular waveguide 相似文献
19.
V. A. Balakirev I. N. Onishchenko D. Yu. Sidorenko G. V. Sotnikov 《Technical Physics》2002,47(2):227-234
A study is made of the excitation of a transition radiation pulse during the injection of a charged particle bunch through the end metal wall into a semi-infinite cylindrical waveguide. Exact analytic expressions for the fields of a thin ring-shaped bunch are obtained in terms of the Lommel functions of two variables. The energy efficiency, power, and spectrum of radiation emitted from a finite-size charged bunch in a vacuum waveguide are calculated numerically with allowance for the multimode nature of the excited field. It is shown that, under certain conditions, the bunch can generate a short, high-intensity electromagnetic pulse with a broad frequency spectrum. The effect of various parameters of the charged bunch-waveguide system (such as the bunch current, bunch duration, and waveguide radius) on the generation efficiency of a transition radiation pulse is investigated. 相似文献
20.
Super-reltron theory and experiments 总被引:1,自引:0,他引:1
Miller R.B. McCullough W.F. Lancaster K.T. Muehlenweg C.A. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(3):332-343
A highly efficient, high-power microwave tube called super-reltron is reported. The authors have achieved operation at >400 MW with ~50% efficiency at 1 GHz, and 250 MW with 40% efficiency at 3 GHz. The RF pulse durations are typically a few hundred nanoseconds. These compact lightweight tubes do not require an external magnetic field. The RF output coupling is straightforward and delivers the power directly via the fundamental TE10 wave in a rectangular waveguide without a mode converter. The key features of the tube include (i) generation of a well-modulated electron beam by periodic virtual cathode formation, (ii) postacceleration of the modulated beam to reduce the relative electron energy spread, and (iii) a multicavity output section that efficiently extracts power without RF breakdown. Various theoretical aspects of the device are discussed and the experimental results are summarized 相似文献