共查询到19条相似文献,搜索用时 156 毫秒
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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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曙光一号自由电子激光装置的设计研究 总被引:1,自引:0,他引:1
曙光一号自由电子激光装置(SG-1 FEL)是一台高功率毫米波段自由电子激光放大器,它由3.5MeV直线感应加速器、电子束调制系统、变参数摇摆器和微波种子源等部件组成。本文扼要叙述了SG-1 FEL的物理设计和主要技术参数,并重点分析了各主要部件的实验研究、计算模拟,以及物理设计和结构的特点。 相似文献
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据自由电子激光原理,利用变参数摇摆器设计可以大幅度提高自由电子激光放大器的效率,在分析文献中所提出的“单电子共振”和“磁场指数下降法”基础上,提出了变参数摇摆器的“多电子自洽设计和最佳选择”的设计方法。经数值计算证明,所提出的方法明显优于其它方法。 相似文献
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对曙光一号自由电子激光实验方案和结果进行了系统的理论分析和数值计算。首先用实测的束流发射度ε_N=0.36~0.63rad·cm论证了电子束可以不经调制而由束流传输段直接进入摇摆器达到有效产生自由电子激光。其次用编制的三维电子束传输程序模拟2kA强流束从加速器出口到摇摆的器入器传输过程。最后根据实测参数,使用CEBQ程序和WAGFEL程序,对曙光一号ASE实验、功率放大实验和磁场失谐曲线进行的计算表明,曙光一号束流发射度大约在印ε_N=0.61~0.8rad·cm附近;ε_N=0.8rad·cm时,上述实验与曲线的理论计算基本一致;曙光一号双向聚焦摇摆器设计是成功的;从功放结果分析,磁控管输入摇摆器的TEO1模的功率约为50W,并对下一轮实验提出了改进意见。 相似文献
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自由电子激光振荡器的二维数值模拟 总被引:2,自引:2,他引:0
在柱二维坐标系中,用数值计算方法求解了摇摆器内电子模拟方程组、光场方程组和无源区(不含摇摆器区)经非自适应方法变换后的无源旁轴波动方程并设计了相应的程序R_2D。用该程序计算的数值结果表明,在有源条件下二维数值模拟结果与高斯光束近似下的数值模拟结果符合较好;取完全相同的计算条件R-2D程序与洛斯阿拉莫斯实验室(LANL)的FELEX程序的计算结果符合较好;初步认为LANL实验数据的物理图象合理,数值结果基本可信;最后给出北京自由电子激光器(BFEL)的一些物理数据。 相似文献
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对曙光一号自由电子激光装置电子束发射度的测量值进行了深入的分析。严格地计算了不同发射度的束流在摇摆器内的传输,计算了发射度对激光功率的影响。由此得出,曙光一号自由电子激光器可以省去9米长的束流选择段。 相似文献
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金晓黎明 许州黎维华 杨兴繁陈天才徐勇 余虹王远 沈旭明程云 谢敏卢和平 邓德荣刘婕 崔丽杨茂荣 李正红胡克松都兴绍 俞泉兔黄孙仁邓仁培 刘锡三 《工程物理研究院科技年报》2004,(1):I0004-I0007
自由电子激光器(FEL)是一种将相对论性电子的动能变换成电磁辐射的装置。电子束和电磁波沿摇摆器在同一直线上传输,摇摆器使电子产生横向的速度分量,实现电子和辐射场之间的能量交换。从电子束抽取的动能转换成电磁辐射,辐射的波长决定于电子束的能量和摇摆器参数。FEL具有波长连续可调、可获得高功率和光束品质好等优点,在军事上和基础科学研究中有很好的应用前景,美国、日本以及一些欧洲国家对自由电子激光的研究极为重视,并得到了很好的成果。2004年7月美国的JLAB实验室获得了10kW的自由电子激光,使人们对自由电子激光在激光武器中的定位进行了重新思考,从而掀起了又一轮世界范围内的自由电子激光研究热潮。 相似文献
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提出采用具有能量啁啾电子束的自由电子激光放大器放大啁啾脉冲,分析说明了它的工作机理和滑移现象对其的影响。采用研制的1维非定态程序GOFEL-P,对能量啁啾自由电子激光放大器放大啁啾脉冲的过程进行了数值模拟和分析,计算了不同啁啾参数的脉冲被放大后的腔外压缩情况。结果表明:与单能电子束时相比,能量啁啾自由电子激光可以放大具有更大啁啾参数的啁啾脉冲,使压缩后的脉冲峰值功率增大至568 GW,脉冲宽度缩短至2.29 fs,大幅增强自由电子激光放大啁啾脉冲以及腔外压缩脉冲的效果。 相似文献
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自由电子激光振荡器的三维数值模拟 总被引:4,自引:4,他引:0
仔细地考查了与三维自由电子激光振荡器物理方程组相应的3-Ⅰ程序的可靠性。在此基础上使用该程序计算、分析了在电子束与光束同轴条件下,当电子束参数如能散度、发射度、束流等参量改变时三维自由电子激光的一些基本规律。 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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Electric-Wiggler-Enhanced Three-Quantum Scattering and the Output Power Affected by this Scattering in a Free-Electron Laser
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We derive the cross section of scattering through the three-quantum interaction of an electron with the incident laser field, the emitted photon, and an axial electrostatic field produced by the magnetic wiggler in the magnetic wiggler acting as the sole zeroth-order perturbing classical field in the first free-electron laser (FEL). In the derivation, we apply quantum-wiggler electrodynamics (QWD). We find that this scattering predominates the usual two-quantum scattering. The output power of spontaneous free-electron two-quantum Stark emission driven by the above electrostatic field attenuated by the three-quantum scattering agrees within a factor of 10 with the measured power in the case of the first FEL. 相似文献
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Shiqiu Cheng Destler W.W. Granatstein V.L. Antonsen T.M. Jr. Levush B. Rodgers J. Zhang Z.X. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1996,24(3):750-757
The results of experiments with a short period (9.6 mm) wiggler sheet electron beam (1.0 mm×2.0 cm) millimeter-wave free electron laser (FEL) amplifier are presented. This FEL amplifier utilized a strong wiggler field for sheet beam confinement in the narrow beam dimension and an offset-pole side-focusing technique for the wide dimension beam confinement. The beam analysis herein includes finite emittance and space-charge effects. High-current beam propagation was achieved as a result of extensive analytical studies and experimental optimization. A design optimization resulted in a low sensitivity to structure errors and beam velocity spread, as well as a low required beam energy. A maximum gain of 24 dB was achieved with a 1-kW injected signal power at 86 GHz, a 450-kV beam voltage, 17-A beam current, 3.8-kG wiggler magnetic field, and a 74-period wiggler length. The maximum gain with a one-watt injected millimeter-wave power was observed to be over 30 dB. The lower gain at higher injection power level indicates that the device has approached saturation. The device was studied over a broad range or experimental parameters. The experimental results have a good agreement with expectations from a one-dimensional simulation code. The successful operation of this device has proven the feasibility of the original concept and demonstrated the advantages of the sheet beam FEL amplifier. The results of the studies will provide guidelines for the future development of sheet beam FELs and/or other kinds of sheet beam devices 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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Goro Isoyama Ryukou Kato Shigeru Kashiwagi Tetsuya Igo Yutaka Morio 《Infrared Physics & Technology》2008,51(5):371-374
Free electron laser (FEL) and self-amplified spontaneous emission (SASE) are being developed in the far-infrared region using the L-band electron linac at the Institute of Scientific and Industrial Research (ISIR), Osaka University. The L-band linac was recently remodeled extensively not only for higher operational stability and reproducibility but also for high power operation of FEL. After commissioning of the linac, we first began SASE experiment with a newly-developed strong-focusing wiggler. Recently we began FEL experiment and obtained lasing with the high peak power at 70 μm again after a long break. 相似文献