Masing and Single-Mode Locking in a Free-Electron Maser Employing Prebunched Electron Beam

Cohen, M.; Eichenbaum, A.; Arbel, Michael; Ben-Haim, D.; Kleinman, H.; Draznin, M.; Kugel, A.; Yacover, IM; Gover, A.

doi:10.1103/physrevlett.74.3812

Cited by 42 publications

(18 citation statements)

References 17 publications

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“…The PB term is at a maximum for u 0 and is independent of P͑0͒; the SPB has its maximum at u w 0 and is proportional to p P͑0͒. Figure 1 shows the scaling of the maximum values of these three terms as a function of P͑0͒ for the parameters of Table II corresponding to our PB-FEM experiment [4].…”

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confidence: 95%

“…In conventional synchrotron-undulator radiation with a uniform, randomly distributed electron beam [1], the radiation field is only partially coherent and its power is proportional to the beam current. By contrast, in the superradiant synchrotron-undulator emission ("prebunched beam radiation"-PB) [2][3][4][5][6][7][8][9] the radiation field is fully coherent, and its power is proportional to the square of the beam current.…”

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confidence: 99%

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Superradiant and Stimulated Superradiant Emission in a Prebunched Beam Free-Electron Maser

et al. 2001

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An electron beam, prebunched at the synchronous free-electron laser frequency and passing through a magnetic undulator, emits coherent (superradiant) synchrotron undulator radiation at the bunching frequency. If an external electromagnetic wave is introduced into the interaction region, at the same frequency and at a proper phase, the radiation process will be stimulated (stimulated prebunched beam radiation). We report first experimental measurements of stimulated superradiant emission in a prebunched free-electron maser. Measurements are in good agreement with theory.

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Superradiant and Stimulated Superradiant Emission in a Prebunched Beam Free-Electron Maser

et al. 2001

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“…2 and 3, we have used experimental parameters for free electron maser experiment with a prebunched electron beam of Cohen et al 8,9 The corresponding parameters are given in Table I of Beniwal et al and for waveguide radius a 1 = 0.2 cm, beam radius r b = 0.2 cm, and mode number n = 1, i.e., the first zero of the Bessel function. In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Single mode solution in a free electron maser using prebunched electron beam at or near the natural oscillation frequencies of the resonator has been demonstrated by Cohen et al 8 In this case, when the electron beam is prebunched at a frequency close to an eigenfrequency of the cavity, the oscillation build up is sped up and the radiation build time is shortened significantly. An experimental project aimed at demonstrating free electron maser ͑FEM͒ operation with prebunching is in process at Tel Aviv University.…”

Section: Introductionmentioning

confidence: 94%

“…Recently, there has been a great deal of interest in studying the free electron laser [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] by prebunched electron beams. Single mode solution in a free electron maser using prebunched electron beam at or near the natural oscillation frequencies of the resonator has been demonstrated by Cohen et al 8 In this case, when the electron beam is prebunched at a frequency close to an eigenfrequency of the cavity, the oscillation build up is sped up and the radiation build time is shortened significantly.…”

Section: Introductionmentioning

confidence: 99%

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Effect of beam prebunching on gain and efficiency in a free electron laser: Nonlocal theory

Bhasin¹,

Sharma²

2007

Physics of Plasmas

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Beam prebunching on the free electron laser (FEL) offers considerable enhancement in growth rate, efficiency, and gain when the prebunched beam electrons are in the retarding zone and the electron beam is highly modulated implying the largest beam oscillatory velocity due to wiggler. A nonlocal theory of this process has been developed. The growth rate, efficiency, and gain were evaluated based on existing experimental parameters and compared with available theoretical/experimental results. Nonlocal effects reduce the linear growth rate of the FEL instability. The growth rate, efficiency, and gain of the FEL instability increase with the modulation index and has the largest value when the modulation index approaching unity in addition to the frequency and wave number of the prebunched beam are comparable to that of the radiation wave. The growth rate of the FEL instability scales as one-third power of the beam current in the Compton regime and one-fourth power in the Raman regime.

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Modeling of terahertz radiation emission from a free‐electron laser

Sharma

Panwar

Sharma

2017

Contrib. Plasma Phys

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In this article, we report the generation of terahertz (THz) radiation using the interaction of a laser-modulated relativistic electron beam (REB) with a surface plasma wave. Two laser beams propagating through the modulator interact with the REB, leading to velocity modulation of the beam. This results in pre-bunching of the REB. The pre-bunched beam travels through the drift space, where the velocity modulation translates into density modulation. The density-modulated beam, on interacting with the surface plasma pump wave, acquires an oscillatory velocity that couples with the modulated beam density to give rise to a nonlinear current density which acts as an antenna to give THz radiation. By optimizing the parameters of the beam and the wiggler, we obtain power of the order of 10 −4 using the current scheme. KEYWORDSfree-electron laser, surface plasma wave, terahertz radiation, wiggler 1

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Masing and Single-Mode Locking in a Free-Electron Maser Employing Prebunched Electron Beam

Cited by 42 publications

References 17 publications

Superradiant and Stimulated Superradiant Emission in a Prebunched Beam Free-Electron Maser

Superradiant and Stimulated Superradiant Emission in a Prebunched Beam Free-Electron Maser

Effect of beam prebunching on gain and efficiency in a free electron laser: Nonlocal theory

Modeling of terahertz radiation emission from a free‐electron laser

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