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  • 1
    Electronic Resource
    Electronic Resource
    Free-electron lasers: Scaling laws for microundulator operation in magnetoresonance with a strong guide field (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 398-403 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations give evidence that a weak microundulator (field on axis: Bu≈50 G, period: λu≈5 mm), operating in magnetoresonance with a strong guide field (Bg≈3×104 G), is capable of producing millimeter and submillimeter radiation with an output power around 1 MW. The electronic efficiency appears to range between 1% and 5%, depending on the radial profile of the electron beam density at the undulator entrance. As an example, the energy of the electron beam is 300 kV to yield a radiation frequency slightly below 200 GHz. Analytical scaling laws for the electron dynamics at magnetoresonance predict that the relative spectral width of the spontaneous emission is proportional to (Bu/Bg)2/3, thus giving support to the surprising results in the case of a weak microundulator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870841
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  • 2
    Electronic Resource
    Electronic Resource
    On the sideband structure of free electron laser emission spectra (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 402-406 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Assuming the magnetic field in a planar undulator of a typical infrared free electron laser, in the paper we address specific effects on the spontaneous emission and the small-signal gain imposed by the electron dynamics. It is analytically demonstrated that weak misalignment (order of 1 mrad) of the undulator axis with respect to the optical axis of the resonator leads to a spectrum being rich in side maxima (sidebands). These sidebands appear as a consequence of a phase modulation of the radiation of the electrons caused by the betatron oscillation, their spectral spacing roughly given by the Doppler up-shifted betatron frequency. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871866
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  • 3
    Electronic Resource
    Electronic Resource
    Free-electron lasers: Spontaneous emission of electrons with chaotic orbits (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3517-3523 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A single-particle computer model is used to calculate the electron trajectories in combined helical wiggler and guide fields. The analysis considers the effects of a realizable wiggler field. Special attention is focused on the stability of the electron orbits near magnetoresonane. Upon calculating Poincaré surface-of-section plots and Lyapunov exponents, it is shown that the electron dynamics is chaotic. Analyzing the spectra of spontaneous emission, it is found that regular and chaotic orbits might be discriminated by optical measurements: off resonance, the spectra consist of well-defined lines. On the other hand, near magnetoresonance, chaotic orbits are revealed by noisy spectra concentrated at low frequencies, and a sudden breakdown of the integral radiant energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859729
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  • 4
    Electronic Resource
    Electronic Resource
    Chaotic behavior of electron orbits in a free electron laser near magnetoresonance
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 304 (1991), S. 492-496 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(91)90915-D
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of electron dynamics on spontaneous emission spectra in free electron lasers
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 318 (1992), S. 669-674 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0168-9002(92)91137-X
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of reversed and conventional guide field operation in a free electron laser
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 341 (1994), S. ABS99-ABS100 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9002(94)90466-9
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  • 7
    Electronic Resource
    Electronic Resource
    Microundulator operation resonantly enhanced by a strong magnetic guide field
    Amsterdam : Elsevier
    Nuclear Instruments and Methods in Physics Research Section A: 341 (1994), S. 440-443 
    Details
    ISSN: 0168-9002
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0168-9002(94)90400-6
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  • 8
    Electronic Resource
    Electronic Resource
    Hartree-Fock-Slater exchange for anisotropic occupation in momentum space (1985)
    Springer
    Czechoslovak journal of physics 35 (1985), S. 168-175 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the well-known expression of the Hartree-Fock-Slater exchange energy (usually calculated for an occupied Fermi sphere) becomes scaled by a dimensionless factor in the case of a simple (compact) Fermi body and of only one (partially filled) band. Analytical results are presented for the following occupied regions in momentum space: i) ellipsoid of revolution (prolate as well as oblate), ii) ellipsoid with three unequal axes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01595628
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  • 9
    Electronic Resource
    Electronic Resource
    Sideband evolution from spontaneous into amplified emission in a free electron laser (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 2085-2096 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theoretical study of the evolution of sidebands, originating from large-scale (nonlinear) oscillations in the electron dynamics, is reported for a combined wiggler and guide field system operating near magnetoresonance. These sidebands, already existent in the spectrum of spontaneous emission, are followed up through small signal gain computations, and are finally recovered in the simulations of the nonlinear saturation process. A comparison with a radiation spectrum of an experiment done at the Naval Research Laboratory (NRL) shows good agreement. This indicates that the sidebands, observed in the experiment at saturation power level, are essentially due to the specific structure of the spectrum of spontaneous emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096374
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  • 10
    Electronic Resource
    Electronic Resource
    Resotron: A Novel Tunable Millimeter and Submillimeter Wave Source of Radiation (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 737-747 
    Details
    ISSN: 1572-9559
    Keywords: free electron laser ; magnetoresonance ; microwiggler ; submillimeter waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The need for tunable radiation sources in the millimeter and submillimeter range for spectroscopic purposes is still a research area of great interest. The tunable radiation source, proposed in this paper, is a special free electron laser device with the prerequisite of low electron energy. The output power density in the millimeter (GHz)-range is of the order of MW/cm2 and in the submillimeter (THz)-range of the order of kW/cm2. The device consists of an electron source with electron optics, wiggler/microwiggler, and a longitudinal magnetic field. The wiggler for the THz-regime has a very short wiggler period of approximately 400 μm and could be manufactured with laser micromachining techniques. The free electron laser operates in magnetoresonance and shows surprisingly stable electron orbits and therefore narrow output frequencies. Computational results of the temporal behavior of the output power done with a multi-frequency code are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022650425927
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