A tunable pre-bunched CW-FEM

Mayhew, S.E.; Al-Shamma’a, A.I.; Stuart, R.A.; Shaw, Andy; Balfour, C.; Lucas, James M.

doi:10.1016/s0168-9002(97)00511-1

Cited by 12 publications

(7 citation statements)

References 2 publications

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“…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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mentioning

confidence: 99%

“…Some experimental studies of various radiation processes occurring in a prebunched beam FEL were carried out earlier [4][5][6][7][8][9]. We developed a tabletop prebunched beam FEM apparatus (Fig.…”

mentioning

confidence: 99%

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

et al. 2001

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“…is the axial wave number of mode q, k w 2= w is the wiggler wave number, v ?0 is the transverse wiggler velocity,ê q E q 0; 0=jE q 0; 0j is a unit vector in the direction of the field of the radiation mode q, Z q is the mode impedance (in free space and for the fundamental mode of an overmoded waveguide Z q =" p ), and the effective mode area is defined by A emq P q jE q? 0; 0j 2 =2Z q : (8) This expression (6) exhibits the L 2 dependence of the spectral energy on L. However, the scaling of other radiation parameters, such as the total energy emission into a mode [the frequency integral of (6)], may be different.…”

Section: Enhancement Of Superradiant Emission In Prebunched Electmentioning

confidence: 99%

“…1(c). At long wavelengths the effective cross-section area A emq (8) corresponding to the waveguide cross-sectional dimensions (limited primarily by the width of the e-beam) is smaller than the free-space propagation effective mode area (10). Then using a waveguide enhances the radiative emission.…”

Section: A Radiation Enhancement In a Waveguidementioning

confidence: 99%

Superradiant and stimulated-superradiant emission in prebunched electron-beam radiators. II. Radiation enhancement schemes

Gover

Dyunin

Lurie

et al. 2005

Phys. Rev. ST Accel. Beams

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Further enhancement of the intense coherent superradiant and stimulated-superradiant emission from prebunched electron beams is possible, in schemes of prebunched beam radiation devices, and particularly free electron laser (FEL). The enhancement of coherent power and spectral power by use of a waveguide, particularly at the zero-slippage condition, is evaluated. A special scheme of a stimulated-superradiance FEL oscillator is analyzed and is shown to feature ultimate radiative energy conversion efficiency (near 100%). A. GOVER et al. Phys. Rev. ST Accel. Beams 8, 030702 (2005) 030702-2 A. GOVER et al. Phys. Rev. ST Accel. Beams 8, 030702 (2005) 030702-4

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“…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%

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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A tunable pre-bunched CW-FEM

Cited by 12 publications

References 2 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

Superradiant and stimulated-superradiant emission in prebunched electron-beam radiators. II. Radiation enhancement schemes

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

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