共查询到19条相似文献,搜索用时 125 毫秒
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给出了双波荡器自由电子激光器的通用理论.在双波荡器自由电子激光器中,引入了一个周期长度非常接近主波荡器中电子束感应加速振荡周期的附加波荡器.推导出了一套自治方程组描述双波荡器中自由电子激光场演变过程,并分别给出了低增益、高增益和饱和三种情况下的解析解.研究表明,适当选择附加波荡器的参数,可以提高自由电子激光器的增益或转换效率 相似文献
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台式拉曼自由电子激光器建议 总被引:2,自引:0,他引:2
提出台式拉曼自由电子激光器的建议,新型台式拉曼自由电子激光器由马克斯发生器、虚火花放电电子束源和小周期波荡器等部分组成。外形尺寸将为传统的拉曼自由电子激光器的1/4至1/5。 相似文献
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采用三维自洽非线性理论计算方法,针对小周期波荡器自由电子激光器进行了数值模拟计算研究.结果表明,在我所现有脉冲线加速器基础上,采用周期为10mm的波荡器,可获得输出功率为20MW,波长为1.7mm的自由电子激光.最后给出实用化总体实验设计方案. 相似文献
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相对论性电子在周期性磁场中的运动将产生自发辐射,这是产生自由电子激光的基础。本采用行波磁场作为周期性磁场,通过讨论可以看出,当电子通过这种磁场时将产生自发辐射,说明该磁场能作为自由电子激光器的摆动器。 相似文献
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曙光一号自由电子激光器的理论计算 总被引:1,自引:0,他引:1
系统总结曙光一号自由电子激光器理论计算的主要结果:包括曙光一号装置主要参数的选取和理解;磁场失谐曲线的计算;常参数摇摆器和变参数摇摆器的主要结果;高阶波导模的贡献;电子束参数扰动对激光性能的影响;空间电荷效应等。计算结果表明,常参数摇摆器激光输出功率可达80MW,效率约50%;变参数摇摆器激光输出功率可达250MW左右,效率约16%。 相似文献
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Wang C. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1994,22(5):649-653
We have simulated a 3 cm wavelength free-electron laser afterburner (FEL Afterburner) using two sets of parameters: one is for a 3-cm period wiggler and the other is for a 5.4 cm period wiggler. For the 3 cm period wiggler, the input beam energy is 112.5 keV, and for the 5.3 cm period wiggler the beam energy is increased to 290 keV to make the FEL Afterburner operate at the same frequency. It is found, from the simulations, that the FEL Afterburner with a longer period wiggler has a higher power conversion efficiency: larger than 16% $ for the 5.4 cm wiggler while only about 9% for the 3 cm wiggler. It is also shown that to enhance the interaction efficiency in the slow wave cavity, the slow wave number should be a little larger than the sum of the fast wave number and the wiggler wave number 相似文献
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PHASE SPACE ANALYSIS OF FREE ELECTRON LASER EFFICIENCY REDUCTION DUE TO RANDOM FIELD ERROR 总被引:1,自引:0,他引:1 下载免费PDF全文
Considering the random field error of the wiggler, we deduce the equation of phase motion and calculate the phase volume of interaction in a real helical wiggler. The result was compared with the case of the ideal wiggler field. We analyze how the random field error causes the efficiency of free electron laser (FEL) to reduce, and simulate the FEL efficiency reduction effect according to the mechanisms which we present in this paper. The consequence agrees excellently with the experiment. 相似文献
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Summary The Hamiltonian for an electron travelling through a large-amplitude backward electromagnetic wave, an axial guide magnetic
field and radiation field is formulated. Poincaré surface-of-section plots show that this Hamiltonian is non-integrable, and
leads to chaotic trajectories. Equilibrium conditions are derived in the limit where the radiation field approaches zero.
Compared to conventional FEL, the total energy of the system at pondermotive resonanceE
c is large, while the electron's critical energy γc is low for electromagnetic wiggler FEL. Moreover, the threshold wave amplitude (A
r=A
c) of beam chaoticity is found at lower values of the radiation field amplitude compared to magnetostatic wiggler FEL. Previous
features confirmed that electromagnetic wiggler FEL can operate more coherently and more efficiently at moderated particle's
energy compared to magnetostatic wiggler FEL. 相似文献
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Conde M.E. Bekefi G. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1992,20(3):240-244
A new regime of free-electron laser (FEL) operation using a helical wiggler field and a reversed axial guide magnetic field is reported. The orientation of the axial field is such as to oppose the electron rotation imparted by the helical field. The 33.3-GHz FEL amplifier is driven by a mildly relativistic electron beam (750 kV 300 A, 30 ns) and generates 61 MW of radiation with a 27% conversion efficiency. The results are compared with those obtained when the axial guide field is in its conventional orientation, where considerable loss of power and efficiency is observed 相似文献
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Efficiency enhancement of a two-beam free-electron laser using a nonlinearly tapered wiggler 下载免费PDF全文
A nonlinear and non-averaged model of a two-beam free-electron laser (FEL) wiggler that is tapered nonlinearly in the absence of slippage is presented. The two beams are assumed to have different energies, and the fundamental resonance of the higher energy beam is at the third harmonic of the lower energy beam. By using Maxwell's equations and the full Lorentz force equation of motion for the electron beams, coupled differential equations are derived and solved numerically by the fourth-order Runge-Kutta method. The amplitude of the wiggler field is assumed to decrease nonlinearly when the saturation of the third harmonic occurs. By simulation, the optimum starting point of the tapering and the slopes for reducing the wiggler amplitude are found. This technique can be applied to substantially improve the efficiency of the two-beam FEL in the XUV and X-ray regions. The effect of tapering on the dynamical stability of the fast electron beam is also studied. 相似文献
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毫米波自由电子激光的数值模拟和实验的比较 总被引:2,自引:0,他引:2
从波导管毫米波自由电子激光器的设计要求出发,根据Livermore实验室FRED程序的物理思想,编制了空间三维的数值模拟程序(WAGFEL)。为了检验程序的可靠程度,结合ELF装置的实际参数,进行了数值模拟并和实验结果进行了比较。结果表明,把Wiggler磁场B_w增大300 Gs后,WAGFEL程序的模拟结果和Livermore实验室的实验结果基本符合。模拟使用的全部参数,除B_w增大300Gs外,都是ELF的实际参数。模拟时峰值磁场B_w=4050Gs,实验测量峰值磁场B_w=3720Gs,相差在8%左右。WAGFEL程序可以用来从事毫米波自由电子激光器的设计以及基本物理问题的研究。 相似文献
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Efficiency enhancement of a two-beam free-electron laser using a nonlinearly tapered wiggler 下载免费PDF全文
A nonlinear and non-averaged model of a two-beam free-electron laser(FEL) wiggler that is tapered nonlinearly in the absence of slippage is presented.The two beams are assumed to have different energies,and the fundamental resonance of the higher energy beam is at the third harmonic of the lower energy beam.By using Maxwell’s equations and the full Lorentz force equation of motion for the electron beams,coupled differential equations are derived and solved numerically by the fourth-order Runge-Kutta method.The amplitude of the wiggler field is assumed to decrease nonlinearly when the saturation of the third harmonic occurs.By simulation,the optimum starting point of the tapering and the slopes for reducing the wiggler amplitude are found.This technique can be applied to substantially improve the efficiency of the two-beam FEL in the XUV and X-ray regions.The effect of tapering on the dynamical stability of the fast electron beam is also studied. 相似文献